Getting the bike ready for the spring...

tylerscool45

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I wanted to start getting my motorized bike up and running soon.
Last fall i was riding it my clutch broke and engine sproket tooth broke.

Got a new sprocket recently and replaced it.

It has a few problems though...

The engines heat sink(sorry i dont know the exact name) must have gotten
real hot over the time i had riden it and the fans(sorry) have seemed bent slightly. My friend says it wont start, but has anyone else had these problems with grubee engines?

Next, my clutch is extremely hard to pull and its been like this since i got it, is this normal or is there something i can do about it.

Finally, right before summer last year i broke it and since i fixed it after my throttle seems to accelerate accelerate and then makes a weird noise and decelerates even though my throttle is fully open.

If anyone knows how to fix all or any of these problems help would be greatly appreciated.
 
tylerscool45, your post about heatsinks and fans makes very little sense.
I would suggest that you jump onto Wiki or somewhere and learn a tiny bit about 2-stroke engines, in particular the names of a few of the main parts and especially the names of the parts that you're having trouble with.

These clutches are all hard to pull in, out of the box.
First, oil the clutch cable, if you haven't already.
Next, pull off the countershaft sprocket cover, remove the pin from the centre of the shaft, put a dab of grease in the hole and replace the pin.
Put a dab of grease on the end of the pin.
Finally, ensure that the small pivoting shaft with a semi-circular cam on the end is well greased. If you turn it and pull, you'll find that it comes out easily for greasing.

If your clutch is still too stiff, there are two more ways to improve things.
The first is a bit of grinding and smoothing:- Another useful HT clutch mod

The other way to make the clutch easier to use is to buy a clutch roller setup from Al.Fisherman. The relevant thread is here:- For Sale..Clutch roller bracket for HT
If you do both mods, even a baby could pull your clutch in.


Finally, right before summer last year i broke it and since i fixed it after my throttle seems to accelerate accelerate and then makes a weird noise and decelerates even though my throttle is fully open.

What broke?
What type of weird noise and where does it come from? ie exhaust, clutch, etc.

You really do need to be much clearer if you expect anyone to help you.

... Steve
 
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man, i don't mean to be rude..but did i just read about heat sinks and fans?
are we talking about a computer, or a 2 stroke engine?

That's the same as saying "the doohicky won't line up with the thingamabob, and the johnson shaft is bent".
 
man, i don't mean to be rude..but did i just read about heat sinks and fans?
are we talking about a computer, or a 2 stroke engine?

That's the same as saying "the doohicky won't line up with the thingamabob, and the johnson shaft is bent".

Im sorry, i dont know too much about motors but i know alot about computers so i just called it that :D.

And as for the noise its coming from the engine... it accelerates then decelerates and makes a weird noise and the rpms slow and so does the bike.
What broke was my clutch before. My friend who knows about motors says its something with the carb but i tried to fix it and it won't fix, so i don't think its the carb.
 
I surrender. Get your friend who knows about motors to have a look at it.
I'm sick of trying to help people who won't help themselves. I'm outta here.

... Steve
 
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One more try:-
As I said in my last attempt, please do a little reading, learn a few names, and try to describe things accurately. I suspect that the heatsink is the cylinder and/or head and that the fans are fins, but I'm only guessing.
(A deal - I'll be a little more civil if you do a little bit of reading.)

Once again, what type of weird noise and where exactly does it come from? (Not simply 'the engine') Even LHS front, RHS rear etc will help, along with the type of noise - grinding, backfiring, squealing, clunking etc.

it's something with the carb and I tried to fix it but it won't fix
If you don't know just what's wrong with the carb, how did you try to fix it and why won't it fix?

... Steve
 
Ok ive taken some pictures to help explain my problem.

First i beleive your correct that they are fins i should have known that haha, but anyway my worry about them is they are bent and my friend said to replace the motor and not even bother putting it back together, because he beleives it wont even start or it will break within the first few minutes, even though ive only used it on year.

If you don't know just what's wrong with the carb, how did you try to fix it and why won't it fix?

My friend told me that may be the problem... So him and i tried to fix it with no luck that's what i was talking about. The picture below with the screw is what we thought was the problem but obviously wasn't.

Now for the noise ill have to get back to you on that one, probably tommorow because i have to put it back together to make sure exactly what im hearing. But ill try to explain exactly what i mean because this didn't happen when i first got it, and its about 5-10 mphs slower now...

Before it would accelerate and accelerate and max out rpms.
Now it accelerates accelerates then almost sounds like the motor is going to
shut off and lowers rpms, but ill give you a sound clip when its ready to show you exactly what i mean by the sound. The way for it to go the fastest is to find the best spot like when the throttle is like 75% open, after 75% it decelerates.
 

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I thought that the pics might show the bent fins that your friend says will stop the engine from working. Generally speaking, bent fins won't do any harm. A pic of that will help, but you probably have nothing to worry about on that score.

The screw on the LHS of the carb body is the idle speed screw. When your engine is running, turn it in to increase idle speed or out to decrease it. It doesn't affect the fuel/air mixture, only idle speed.

Now, to the real problem. What you're describing sounds like your fuel/air mixture is possibly too rich. The weird sound might be 4-stroking, a situation that occurs when there is too much fuel and not enough air in the combustion chamber, causing the engine to only fire on every second revolution. Does that ring any bells?
The slide needle controls the mixture up to about 75% throttle, then above that the main jet takes over, from 75% to wide open throttle, (WOT).
My bike did that out of the box and couldn't rev out above 33kph. I finished up working my way down from an 0.79mm jet to an 0.72mm, before I could get it to run well. Then, top speed went up to 51kph - much more respectable. (This was all before I fitted my shift kit - speeds are much higher now.)

So, you could try a smaller main jet and see how it goes. I've built up a small collection of jets for tuning.
I get mine from OzMiniMoto in Australia, but you might be able to get them from somewhere closer. Dellorto 5mm jets are suitable. DellortoDirect sell them, too, although I had a bad experience and won't be dealing with them again.

Mind you, it might be something entirely different. It's interesting that it only just started doing it.
See what, if anything, others have to say.
A sample of that sound would help.

Check this out:- Four Stroking (Thanks again to Al.Fisherman for originally pointing this clip out.)

Is that the sound?

... Steve
 
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Thats it man Sounds exactly like that video when hes "four stroking"

Thats for sure what it does, i could buy a new jet, but i don't know exactly which one ill need theres so many to choose.

I don't know if this will help at all, but before i broke the clutch and before it started acting up, that same day one of my friends used quad gas as i was out, i told him not to use it but it was already in the tank, he said it doesn't make a difference so i drove it home, and rode it after that with the quad gas in there for a while,then after a week or so after my clutch broke. You don't think the quad gas could have screwed it up do you?
 
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