4 stroke hasn't started in over a year

artmaker

Active Member
Joined
Jun 12, 2008
Messages
352
Ok, since my previous threads are so old, will start all over.
I have a Huasheng 4 stroke (improvement over my old 2 stroke) that has given me fits since I got the thing.
I'll post a list of all I did so far below,
short question first.... I THINK I narrowed down the issue to a bad kill switch. Actually I have two of them.
One on the hand grip gave out a year before the thing quit starting, and I've been using the little red button on the side of the motor.
The last time this bike ran, (summer before last) it was running like crap. Nowhere near the power it once had, hard to start... then on Memorial day, first time I started the bike that year, it was a royal pain just to get started. Ran real rough, very short trip, basically just rode a few blocks around my house, and even harder to restart later.... then tried for a late night ride and it simply would NOT start at all.
A friend helped me sort this out using a spark plug tester, and told me that yes, if the kill switch is going bad, it could have been causing all the crappy engine running issues until it just flat out fried. After we disconnected it and tried, at least now the motor sounds like it's trying to fire... (next thing to do is replace the two year old gas and try again.)
So... snooping around online... where the blazes does one find a new kill switch? Also could my having two of them, one on the motor and one on the hand grip have been a problem? I would rather lose the one on the motor and keep the one easier to grab if I have a choice. Or does that even matter.
So any advice on this would be appreciated....


Now for all those interested, the history of my nightmare with this motor.

First, the guy I bought it from sold me his own hand made clutch cover.... which was a hugely bad idea. Piece of cheap tin that awkwardly attached over the clutch, and did NOT seal it.... so every manner of grit and oily crud got right into the clutch, not even one year into this I had to buy a new, closed clutch box, also put in a heavy duty clutch, all of which needed a new chain, different gear ratio. Big pain.

Good for one season, the next started with the hard to start and running kinda rough issues.
First order of business was cleaning the carb. Did that twice, nothing. Replaced it. Also put in a better spark plug... nope.
Someone said adjust the valves, learned about that, bought the gauge, got er done. Got it running BUT....
I must have just got lucky, did not know about finding top dead center. But that got me a season.
Next year was the last time it ran at all. And this time I did not get lucky, read up on finding top dead center, and I STILL can't quite get that one.
Stick a straw into the spark plug hole, turn the engine over and the straw goes up down up down... great. It's a FOUR stroke. Up down up down. WHICH UP IS THE RIGHT UP???? That one I don't know.
Had a mechanic friend look, and HE set it to just the right spot.... (without actually showing me how he knew, and he vanished after this.) I did my adjustments, and still... nothing. Got frustrated and the bike sat ever since. (built another one instead.)

So now... another friend is the one who tried testing for spark and figured out it might just be this kill switch, the test light did light but just barely, then we removed the kill switch and it did light. Hence, it just might be that simple. Faulty kill switch. (again, still not starting but I have yet to flush out the old fuel. I will need some kind of kill switch, may as well get that first.)
And that's where I stand to date.

OH... Also... my exhaust pipe had to be bent to fit my frame, had a friend with a good vice and torch help bend it. That had to be done right away when I first got this motor and it's has run with it, but there is a point in the pipe that got just a bit crimped. I'm guessing here, but at one point the inside of the pipe may be 3/4 the diameter of the rest. I'm wondering if that might have clogged? Or even if just being slightly crimped if it may have over heated the motor and ruined it, and if so is there any way to open the motor up and see? What do you look for in an over heated motor? And if I have to replace the exhaust I think what I'll do is take the old one, and a new one to an exhaust shop and have THEM bend it. Just say match this shape but without the kink. Hope I can find a place that will work on such a skinny pipe. Shops might only have equipment to do car exhausts.

Anyway... kill switches, preferably hand grip only, where to find one.
thanks.

Bike4stroke.jpg

 

Sidewinder Jerry

Well-Known Member
Joined
Mar 14, 2011
Messages
2,508
So started shopping for a TDS tool. GOOD LORD!!!!! Called O'reilly's, guy didn't even know what I was talking about. (unusual for them.) Tried Autozone, all they show is some gadget with long wires on it, not what I need I'm sure.
Tried just shopping online.... the plethora of devices blows my mind! Found the exact one pictured in this thread on ebay SOLD IN PAIRS! I don't need TWO of them.

And STILL no leads on a kill button?
I swear I'm about ready to just buy a new motor and chuck this POS. Except without knowing what went wrong, it may do the same thing.
grrrrrrr.
Here's TDC like I have on eBay.

 

Wrench

Well-Known Member
Joined
Nov 14, 2018
Messages
4,121
To find TDC @ spark on a 4 stroke
With spark plug out, Take off the valve cover. Then turn the engine over by hand and watch the valves move up and down.
Watch the exhaust valve open and close This is the Exhaust stroke - EX open and IN closed
Watch the Intake valve open and close This is the Intake stroke - EX closed and IN open
After the intake valve closes now your on the Compression stroke. EX closed and IN closed
Turning the crank in the same direction line up the trigger plate for spark Now you on TDC @ spark for the Power stroke.
If ya wanna check stick a pencil down the S/P hole
 

mark20

Well-Known Member
Joined
Sep 26, 2018
Messages
2,200
pick your flavor, momentary or toggle.

 

artmaker

Active Member
Joined
Jun 12, 2008
Messages
352
pick your flavor, momentary or toggle.

Both those say MOTORCYCLE. Will they fit the same small motor used for bicycles?
When I go to ebay and search "4 stroke bicycle motor kill switch" I get nothing. Absolutely nothing.
 

Chainlube

Well-Known Member
Joined
Jan 5, 2020
Messages
4,811
Both those say MOTORCYCLE. Will they fit the same small motor used for bicycles?
When I go to ebay and search "4 stroke bicycle motor kill switch" I get nothing. Absolutely nothing.
The simplest and most economic kill switch is two wires, one short one from engine to frame and a longer one from the coil to handle bars. When you want to stop engine touch the wire to the frame.
 

mark20

Well-Known Member
Joined
Sep 26, 2018
Messages
2,200
Both those say MOTORCYCLE. Will they fit the same small motor used for bicycles?
When I go to ebay and search "4 stroke bicycle motor kill switch" I get nothing. Absolutely nothing.
Yeah, all killswitchs do the same thing, ground the coil to shut off spark.
 
Top