Bicycle Engine Sputter

**CRUISER** · #11 (**permalink**) 03-27-2008, 08:59 AM

that is what ussually happens to me. i got my bike all back togather after remodeling it and went for a test drive. pedaled till i thought i was going to have a heart attack and the bicycle motor just wouldnt start. got back home put it in the garage cursing and looked down and remembered when working on it i disconected all the wires. conected them and zoom off i went. i was like duh

deacon · #12 (**permalink**) 03-27-2008, 10:11 AM

Left the post office yesterday, forgot to turn the gas back on got about two blocks it died and I cursed. Then of course I found the problem and was so proud of myself lol

**nogoodnic** · #13 (**permalink**) 03-27-2008, 11:45 AM

I would deffinatly start with the exhaust gasket. The kit gaskets are crap and I have blown more than I can count, I have started making my own gaskets out of high temp teflon that I hand cut...Kelly

deacon · #14 (**permalink**) 03-27-2008, 12:31 PM

I know a leaking exhaust is noisy but I had no idea it could cause an engine to skip. I would think skip was related to the firing of the electrical system. I have always thought of it as a miss fire. I guess I learn something new every day.

**Norman** · #15 (**permalink**) 03-27-2008, 06:40 PM

missing can be caused by a plug that getting dirty or a bad plugwire/connection. A wire that's chafed allowing it to short out. Like wise with the kill switch. or any wiring connection that is not good and tight. Water in the fuel will make your day. Partly plugged filter inside the tank which you all know the tank is spotlessly clean and will never do that.
Then there is the did you hear that thing as well.

deacon · #16 (**permalink**) 03-27-2008, 06:47 PM

So you are saying electrical or fuel problem. Yes I have had water in the gas and it did make it run like crap. Again I am reminded of something I had forgotten. For water in the gas, I use alcohol. Water will mix with alcohol and alcohol will mix with gasoline. Or so I have been told.

**Norman** · #17 (**permalink**) 03-28-2008, 10:52 AM

alcohol will not mix with the type of oils we use, has to be castor oil or an syn. oil that will mix with alcohol. a very small shot of alcohol probably won't hurt but no more than a shot. alcohol will do nasty things to your engine if its not done right. Best thing if you think your fuel has water is get rid of it all including the fuel filter and fuel in the float bowl. The inline paper fuel filter that we should be using will absorb some water but then will become water wet and kind of plug off. It can take a lot of dirt but not much water. Deacon is right alcohol will mix with gas and alcohol will mix with water. I still don't like the taste though makes me spit fire.

VENICE BOY · #18 (**permalink**) 04-02-2008, 12:14 AM

Quote:

Originally Posted by Biker Mike

When I first installed my engine, it ran out great. As time and a few miles went by, it started missing at higher RPM's. I noticed oil coming from the exhaust gasket around this time as well. My question is, would a blown exhaust gasket effect high speed RPM? I have not torn into one of these engines yet and do not know what the reed valves look like (any pic's of valves?).

Change the plug too, NGK B5HS!... move the carb needle to LEAN (needle down, c-clip at top)Double check all wire connections, I like to use solder,(crimps vibrate loose)!
The exaust leak is NOT the cause, my whole pipe fell off in the street going home once & I lost the nuts, so I rode it home with NO PIPE & the bike never ran faster!!!
Another thing I do is adjust the gaps between the spinning magnet & the mag coil to make them equal. I noticed on a few of the engines that I bought the mag coil was WAY OFF. (almost touching)
I don't know if it helps?... but why not?
Also try a 25:1 mix & then a 30:1, see if that helps?

**Bikeguy Joe** · #19 (**permalink**) 04-02-2008, 07:22 AM

Have you adjusted the mag coil? I was asking about that in another thread.

Steve Crutchfield · #20 (**permalink**) 07-09-2008, 06:13 PM

I am having the same problem with my chinese motor. Oil appears to be coming from exaust. It sputters at mid range then it seems to come alive and gets up to 35 mph & runs smooth. Then starts sputtering again. I have checked carb & intake all seems well. ( as well as it can anyway ) I noticed today that my plug wire is coming apart. How do you replace it? Do i have to replace the whole CDI box?