Need help with gears on chainsaw bike

[Sidewinder Jerry]

With China girl engines they which are actually 66cc they generally run a total reduction between 11:1 to 14:1. The engines that run a reduction under 5:1 are the 212cc.

As for gear ratios a 9t is around the smallest you'll find that'd be practical to use. I recommend this engine to jack shaft 10:40; jack shaft to rear wheel 10:40 for a total reduction of 16:1.

Here's your speed formula:

RPM÷(1056× total reduction)×wheel diameter × ⚻

6000÷(1056×16)×27.5×⚻=30.7 mph.

That's a very realistic build for a first time DIY build. I also suggest for the small sprockets to use 410. This way you can use 410 chains.

 

[Mrgoodcat]

Ok wat would u suggest for gearing for a result of 45mph im looking for something to go fairly long distances so I need to have it go a little bit faster

 

[Sidewinder Jerry]

Ok wat would u suggest for gearing for a result of 45mph im looking for something to go fairly long distances so I need to have it go a little bit faster

Your engine is too small to realistically expect to do 45 mph. At best you might could get up to 35 mph provided you aren't a very large person and you don't have any really steep hills to contend with.

 

[Mrgoodcat]

Ok and wat would that look like

 

[Sidewinder Jerry]

[11:38 and 10:40] or [10:30 and 11:50]

 

[curtisfox]

Make sure you get the rotation right as chain saw usually turn opacit as China engines………… Curt

 

[Mrgoodcat]

Thanx

 

[Mrgoodcat]

I think I'm guna go with the Zeda80 cc motor kit and save me a little hassle

 

[JerryAssburger]

I think I'm guna go with the Zeda80 cc motor kit and save me a little hassle

..it'll save you a LOT of hassle!

 

[Mrgoodcat]

O it did!!!

 

[Mrgoodcat]

iv got everything set up right,,, i think ,, and it wont start ? i checked the wiring, plug and fuel everything seems to be in order ,, wats up?

 

[Sidewinder Jerry]

These 2 stroke engines have to be bump started. You'll have to put the chain and rear sprocket on or order a 2 stroke shift kit.

 

[Mrgoodcat]

Ya I got a 36t left side on it now and a 30t on the way