Huasheng 4 stroke keeps wanting to die

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Jun 12, 2008
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#1
Hi biker folk,

So… last year I converted my 2 stroke to a 4. I didn't even get a full season of rides before the piece of junk transmission that came with it from DAX failed. (never buy from that guy.)
So ok, new heavy duty clutch, brand new transmission, new chain (different gear ratio) then whole new rear wheel as my bearings were shot.
So the motor itself is still what I would consider new. Certainly everything attached to it is.
I dumped out last years gas, gave it fresh…. all should be good right?
Spring is here, been out for several rides.
This thing is a royal pain to get started. Pull pull pull….
But finally got it going. Seemed ok, but most of the time if I come to a stop say at a light, or even flying down a long hill and let off the throttle, the darn motor quits.
Not as hard to restart once it's warm…. but it shouldn't be quitting like this.

I'm no mechanic… learning as I go here.
Before I start frustrating myself, best to post here. you guys surely have dealt with this.
I did read a thread already someone posted about his same motor not starting at all. Came down to a clogged fuel jet? So taking mine all apart is not out of my mind all together.
Still mine is so new yet…. hoping this is some simple adjustment somewhere.

(my old 2 stroke gave me fits once… came down to a minor fuel mix adjustment screw and some good gas.
Already did the good gas thing…. don't see any such adjustment screw on mine though.)

Give me a list of what to try first.

Go.
 




CrazyDan

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#4
Your main jet is located above the bolt holding the bowl on the bottom of the carb. Your idle jet is located under the brass plug on the left side of the carb nearest the engine. Drill a small hole in the plug and use a wood screw to remove it, thread till it gets stuck then use vice grips to twist while pulling out. Look up idle tuning while you are at it.
 

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#5
I need visuals. Tried looking this up on youtube. No luck at all. (I can usually find just about anything there.)
I don't see any brass plugs. (spotted this in another thread, but mine???)
I'll go take another look tomorrow, maybe post a picture of my motor.
 

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#6
OK, got the carb off. I actually did find a youtube video of my specific motor.
Huasheng 4 stroke titan.

Questions before I mess this up.
In the video I found, look at photo 1 here. My thumb is over a hole that had a plug with small O ring, got that out, and inside here is a jet. Cleaning this one jet is what was recommended when the motor won't stay running or idol. But in the video he had the piece out by itself.
Well fair enough….
My question now are the gaskets on both sides. DARN they are glued on good and tight and look flimsy as all get out. Before I go and attempt to get them off in one piece, do I really have to?
And if so, any tips on how to remove them and not ruin them?
Lastly, assuming I do ruin them, if anyone knows where to get more… please post that. I may as well order that now, seems sooner than later I'll be repeating this whole process.

Also that bowl (now that I know what it is. lol) Is on good and tight. I'm sure if I could really grab this whole part I could get it off BUT not with those gaskets there. No way to grasp this assembly without crushing them. See the last picture, I already started to crimp one and stopped. So again…. gaskets…. UNLESS I can just blast this with carb cleaner, or poke a wire right down that hole????

Last…. second picture shows an actual adjustment screw AND what looks like this brass plug that in another thread was suggested to drill it out?
My thinking here, it's covered for a reason. And what does that screw adjust? (there is a spring just under it's head.) I left it be since this motor ran just fine until the jet got clogged.
I'm sure that's what the issue is now. TEENY TINY holes in those things. Yikes.

One last thought, before putting this to bed in winter, what's the best suggestion for a last step? I did nothing last year. Changed the old gas come spring.
I do have some stuff for small motors to over winter, never actually used it though. Would that prevent jets from clogging?
What about something like heat? Would that help keep this jet clear without the need to do a full carb job?



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#7
more…. I actually found a gasket kit https://www.gasbike.net/products/4-stroke-gasket-kit
Called them, and they are "not mechanics."
They did suggest a heat gun MIGHT loosen the ones I have. I've got a heat gun so will try it.
Lets jump ahead to my ultimately ruining these… when I order more (and if anyone has a link to just the TWO gaskets I actually need for less money please post it.)
When putting new gaskets on, obviously these were glued in. WHAT do I get? Same stuff for cars? Or does this get too hot?
what?
 

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#8
One last thought…. talking to a shop that builds bikes, they suggested dumping a can of "START" into the gas. Guy said he swears by it. Clean out the carb, jets etc without dismantling everything.
I'm heading out to pick some up. And some gasket sealer. Gonna try to remove the gaskets, heat gun and good sharp straight blade are the best suggestions.
But if a can of stuff once a year keeps this clear, sure sounds easier.

In fact, thinking about this as I type, I just might leave the gaskets alone and put it all back together, try this first.
Any thoughts???
 

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#9
HA! Progress….
I did NOT try to remove the gaskets or bowl. I did poke a very fine wire (one strand off an old brake cable.) Into the hole that plug came out of. Then shot some carb cleaner into that hole and it blasted right out no problem.
Picked up the last two cans of START lowes had. Guessing I have just under 2 gal in my tank, put 3/4 of the stuff in it. I'll probably just dump in the rest. (I really need to make myself a dip stick so I can tell how much gas I actually have in there.)

Anyway, look at my third photo there. That IS some kind of mixture adjustment screw. It was almost all the way out. (Might just do that with all the vibration. Once I find the perfect spot I'll mark it with a sharpie or something.) I got the motor running and turning that screw in a bit increases the idol.
I played and played, pretty sure I found the sweet spot. Took a spin around town, no more dying when I coast, but my top speed dropped by 1-2 kilometers. Not a big deal but still. Wish I knew what I was adjusting.
Bike did just fine, until I got back and came to a dead stop. It died again. Started up easy enough but clearly something still isn't quite right.
Now a spin around town isn't much. (Two square blocks.) I don't know how much of that START stuff it takes to clear everything.

Now what exactly does that screw adjust? In, seems to increase the idol, out and it wants to keep dying.

One last thing to point out, when the motor is on, and bike rear wheel is up in the air on it's kickstand, that wheel is turning. NO matter where the screw is.
Hitting the brake will stop it and obviously stopping stops it. While I was fooling with the adjustment, I can tell you when I stop the wheel completely, I can hear the motor dip as if it want's to die, then something must kick in and keep it going. (I spotted a youtube video about this, will go watch it later.) So maybe what ever mechanism that is, is what's sticking?
But at least my dying is limited to complete stops. And only that one time. I revved it up and hit the brake many times while it was on the kickstand fiddling with the screw and it does fine. Only one death rather than every time I let off the gas so I'm quite pleased with myself right now.
 



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#12
Yup found that video already. It's basically how to hook up a carb. Not clean it.

And now… mine simply will not start. I got it started a few times last night while it's up on the kickstand but as soon as I stop the rear wheel and try to get on it dies.
Few tries like this then it simply would not restart at all.

I'm going to have to order replacement gaskets and just completely take this thing apart. Was hoping I could get it going on Memorial day though. Gonna keep trying, tweaking that adjustment screw more.
Unless parts show up in time.

Heck, I just might pick up a whole new carb. Have one on hand to swap out when this happens again… and I'm sure it will.
 


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#14
It's brand new. Long saga… bought this 4 stroke kit from thatsdax (never again….)
His home made clutch cover was pure crap. And it didn't cover the clutch at all. I didn't even get a full summer of rides in and the thing failed. Took it apart and sure enough, every manner of gunk and road crap was inside there.
So… found a heavy duty three pad clutch and bought a whole new SEALED transmission. Had to get a new chain (smaller gear) then had to get the whole rear wheel rebuilt as the bearings were shot.
So all of this is brand new. And when this new motor is running it has no problem hauling my hefty self up hills where my 2 stroke would stall out. So I don't think the clutch is the issue here.

Now I MIGHT… have the chain a bit tight. Any more slack and it slaps the fender. (already cut that back.)
Still that shouldn't account for my not being able to start the motor now.

I just ordered a gasket kit. My thinking here, there are two jets in these things right? I only got access to one of them. It's gotta be the one I couldn't get to that keeps it idoling right???
I'll try taking it apart again after my gaskets show up. Meanwhile until my arm falls off trying, I'll keep trying to fire it up. Still got that START stuff in the gas. MABEY that will clear things up if I can get enough of it through.
 



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#17
Thought I had the problem down. There was a black mystery cable coming from the motor I don't recall removing… Neighbor suggested it's a vacuum line
Well it's not.
I found a photo of this motor new and that black hose goes into the air filter. Fits perfectly there. Hooked it up. Still the bike will NOT fire. And I can't even pull all the way.
Already chipped the hand grip because several times it snapped back to the motor right out of my hand.

Ever try to restart a lawnmower when the blades are totally clogged with grass? How that simply won't pull at all unless you clear out the grass? Well that's how this feels.
I can barely get the motor to turn one time. Can't even pull all the way. NO fire at all.

Only two things I have not tried is disconnecting the kill button. I doubt that's the issue though. Go back to my first post here. Bike WAS running, just dying at stops, when I'd coast and let off the gas, and got harder and harder to start. So kinda doubt it's the kill switch.
And checking the spark plug since I don't have a single socket that fits AND is long enough. Husband said he'd look at it, but that's not happening either. Again it WAS running. Still thinking somehow this is a carb thing. But dang, I cleaned it TWICE now. Last one it soaked in carb cleaner for almost two days, blasted it with air, put in new gaskets…. NOTHING.

I need to locate a mechanic since clearly I have no clue what else to do here.
Very frustrated. I so love to ride on Memorial day. Not going to happen….. again.
Really wishing I would have just bought a new 2 stroke when my old one wore out. Never had NEAR the issues I'm having with this.

So how does anyone find a mechanic for these? Car shops look at me like I'm crazy. Bike shops won't even let it in the door with a gas motor on it.
Maybe I can find someone with a bunch of lawn mowers for sale. Good bet they know how to fix up the motors right?

Just disgusted.
 

darwin

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#18
That air/fuel mixture screw should be tightened all the way IN, don't need it to be too tight just till it stops. Then back it out 1-1/2 turns. That gets you to where it will start then you can fine tune it to where it will idle fine and not bog down when increasing the RPM's. Where are you located? maybe someone on here is near you to help. That black idle jet will probably need new orings if you boogered the old ones up or they're just hard and brittle. Harbor freight has a metric oring kit that has ones that will work though not exact. Thatsdax might have them, call Duane. Ereplacement.com you can order the part from exploded view from a Honda GXH 50cc, lil pricey but they work. A new carb wouldn't hurt at all in your predicament, keep old one as a spare once you figure stuff out.
 

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#19
Well… ok, lets make sure I know which screw is which.
The air/fuel mixture… thats the one on the side…. Gotta be, since it did effect the idol. So ok, all the way IN then out 1 1/2 Will try.

Black idle jet???? Is that the one… gotta unscrew a black plastic tap screw, pop out a plastic thing? That did have an 0 ring. First attempt it was ok, second full cleaning it got mangled.
I have O rings for jewelry that were too thick. But then I have some for steal darts that were just about the same size as the original. OR possibly ever so slightly thinner. Got one of those on there now and it seemed to be a good seal.
BUT if that isn't quite fat enough, could that be what's preventing me from even pulling the cord without braking my arm? I would think if the ring isn't thick enough too much fuel would find it's way through, not be cut off.

BTW… I'm NEVR calling Dax again. This has been nothing but foul ups since I got it. Buying his full kit was a mistake. He forgot several bolts AND the pedal crank then sent a pedal crank that is bent. (One pedal moves oddly. Don't pedal much so not too concerned. I'll replace that at some point.) His wiz bang motor mount was absolutely impossible to fit. Had to buy a standard one. Still had to fabricate that a bit but at least got it to work on my bike. His idea of a clutch cover is just sad. Doesn't cover the clutch AT ALL. ALl sorts of road gunk got in there. I didn't even get one full summer season out of it. Gees he even put up a youtube video later about how to install his crap home made welded tin cover. What a convoluted system. And even in his own video he's like…. "well there's a hole in this one, maybe I'll cover that with a sticker." A sticker? Seriously? Cheap piece of tin with bendable doo dads to attach it with. Total garbage. Resulted in my needing to replace the clutch AND entire transmission. I don't know why people suggest thatsdax. I sure got one heck of a lemon deal. I'm never calling him. Guy is a moron.

My location is nowhere land SW Michigan. Dinky town called Keeler. (Look for Hartford right off I94, Keeler is 6 miles south.) There is NOTHING here. Already been thinking of ways to attach some kind of stand to my small trailer (holds a riding mower.) Something like a pipe with a cross pipe at the base, clamp it onto the trailer real good so I can stand the bike against that and strap everything down. Until I do that, transporting it isn't happening. Tried twice and both times something got broke. Gotta stand it up and support it. (Be my next project. Be nice to take it places anyway.) I know there are a few houses I pass all the time with tons of lawn mowers always on the front lawn up for sale. I'm thinking that might be my best bet.
 

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#20
Thought I had the problem down. There was a black mystery cable coming from the motor I don't recall removing… Neighbor suggested it's a vacuum line
Well it's not.
I found a photo of this motor new and that black hose goes into the air filter. Fits perfectly there. Hooked it up. Still the bike will NOT fire. And I can't even pull all the way.
Already chipped the hand grip because several times it snapped back to the motor right out of my hand.

Ever try to restart a lawnmower when the blades are totally clogged with grass? How that simply won't pull at all unless you clear out the grass? Well that's how this feels.
I can barely get the motor to turn one time. Can't even pull all the way. NO fire at all.

Only two things I have not tried is disconnecting the kill button. I doubt that's the issue though. Go back to my first post here. Bike WAS running, just dying at stops, when I'd coast and let off the gas, and got harder and harder to start. So kinda doubt it's the kill switch.
And checking the spark plug since I don't have a single socket that fits AND is long enough. Husband said he'd look at it, but that's not happening either. Again it WAS running. Still thinking somehow this is a carb thing. But dang, I cleaned it TWICE now. Last one it soaked in carb cleaner for almost two days, blasted it with air, put in new gaskets…. NOTHING.

I need to locate a mechanic since clearly I have no clue what else to do here.
Very frustrated. I so love to ride on Memorial day. Not going to happen….. again.
Really wishing I would have just bought a new 2 stroke when my old one wore out. Never had NEAR the issues I'm having with this.

So how does anyone find a mechanic for these? Car shops look at me like I'm crazy. Bike shops won't even let it in the door with a gas motor on it.
Maybe I can find someone with a bunch of lawn mowers for sale. Good bet they know how to fix up the motors right?

Just disgusted.
You have touched on the right idea. Small engine/lawn mower mechanic will give a correct diagnosis.
I thought I lived in a small. You win.
Tom from Rubicon
 


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