Motorized Bike Lurching a Bit

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These engines are not exactly torque monsters, so when not at the top of high rpm torque curve they will buck a bit. Always happens when breaking them in, but will get better with time.

It's also a matter of plug selection (NGK B5HS and do the wire upgrade), fuel control, fuel oil mixture (IE tuning)

Not sure what part of the country you are from, but when cold the problem is exacerbated. Mine takes farting forever to get warm when ambient is at 50°F or below.

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There is 101 ways these bikes will lurch We've covered 5 or 6 reasons. You all have good inputs on reasons why. Running out of fuel or starvation at high rpm will do it and so will too low of rpm cruising. Spark can cause it but I'm still stubborn and running the stock plug. I changed the plug wire out to an industrial wire which for me didn't improve my problem one bit it turned out to be my stock plug getting fowled out. I blast cleaned the plug and I'm still using it with no problems. High rpm and the lurching for me was not having the fuel valve on all the way. I know that's what got Bob as well. A short in the wiring will do it and can be hard to find. Run your hand over the wires while its running if you think it might be the cause. You will know if it is cause you'll get lit up if you've got just one strand of the wire sticking out and touching the frame now and them. I found that out, that thing will bite!
Wet climates will short out the kill switch and wet wiring can cause it as well.
Anyone else got one?
Here's my last if you buy one of these engine kits it can and will do all sorts of hateful thing if you let your guard down. But that is sort of the fun isn't it?!
Norman

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This lurch thing reminds me of my third x wife. She came home cursing because she had to buy an alternator on the road. the man asked her didn't you hear the bearings grinding. She said I heard a grinding sound but I turned up the radio.

Sounds like thats the best thing to do with the lurch, turn up the radio except the other noises would drown out the radio. At least on my bike they would.

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Deacon - I did indeed turn-up the radio! In fact, I gave it more throttle and the lurching stopped. It appears that the combination of running at (too) low rpms and babying the motor during break-in caused the lurching. The little sucker loves the throttle and has started to purr a wee bit as I have given it more and as it breaks in. I live in a hilly area and am finding that the stock sprocket works pretty well - enough torque to get up the (moderate hills) with enough speed to keep it interesting.

I'm impressed with the little engine. It runs smoothly (so far) and fairly quietly. It sounds like I'm riding my chainsaw! I'm running stock plug wire and plug and built a wiring harness for it; therefore, shorting / grounding potential is minimized (hopefully). The gears make the characteristic whine. I'll try a wee bit of grease as I've seen in some posts. The chain is stretching; gonna have to take out a link soon.

it will just get better and better. i could not believe when it broke in. you will know it. all of a sudden it goes and it sounds better. first engine i every had that i knew it was broken in. how long it takes i am not sure for every one of these bicycle engines is different and they sure are fun

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That chain is a thorn in my side. I have a new one that does better as far as stretching but it will still 'move' the rear wheel forward after a while. I run a cruiser frame.

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visit my blog for Riding in the hood,... The home brew bike journal....http://frictiondrivebicycles.blogspot.com/ The deacon's fiction

You know... I've been toying with the idea of designing a clamp that allows 1) positive locking of rear wheel (can't shift out of the drops) and 2) uses a threaded fastener to adjust the location of the wheel in the drops. It would actually have to be a pair of clamps that sit on both sides - both drops. I envision something that would allow for fine tuning chain tension and trueness of the wheel (...how parallel it is to the centerline of the bicycle).

Ever come across something like that? I've seen 'locks' on front wheels but not the adjusting functionality.

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Most all motorcycles have chain adjusters on the axles the ones that don't use drive shafts. My Harley runs a belt but it is like a chain and it too has adjusters to get the belt to the proper tension which when right seems tight to me..

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