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2 Stroke Bicycle Engines & Kits 2 stroke engine kits need careful installation and setup, find out how from our professionals here!

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  #11  
Old 12-06-2016, 05:09 PM
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Default Re: Cannonballs Back Into It With A BT 80

Man..no elec. Start..bah um bug. So that engine has a lighting coil also?
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  #12  
Old 12-07-2016, 08:31 AM
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Default Re: Cannonballs Back Into It With A BT 80

I will save the electric start for when I'm too old to pull it and build a trike to keep from falling over.

Yeah it has lighting/charge coils and runs the common pit bike style V reg.
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  #13  
Old 12-07-2016, 10:23 AM
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Default Re: Cannonballs Back Into It With A BT 80

Lol, I'm there already! Build on young man!!
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  #14  
Old 12-09-2016, 02:57 PM
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cannonball2 cannonball2 is offline
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Default Re: Cannonballs Back Into It With A BT 80

Young man heck!

Still waiting on critical parts like handle bars so decided to pull the starter side again and remove the starter sprocket and freewheel and have a look at the electrics.

Used the really nice supplied puller. Works on the alternator rotor and also the clutch I assume. The rotor and in fact the electrics look once again like the Honda clone pit bike engine uses. If so pretty smart using proven off the shelf components. This engine is beautifully made. I have seen nothing but first rate design/manufacturing so far. Of course the proof will be in the running.

The rotor is complete with timing marks. Second 0 mark is when the trigger magnet reaches the trigger coil and the F is when it leaves Should fire between these two marks. T is TDC These markings are very Hondaish. The bigger black coil is for the CDI and the rest are lighting/charge.

Got both chain lines established with no idler necessary. Took a 1/2 link on the 415 to make it work. This engine has a bunch of rotational mass between the heavy rotor and the clutch. Should make it a smooth runner.

If the dang parts would show up I would be riding soon!
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  #15  
Old 12-09-2016, 07:47 PM
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Default Re: Cannonballs Back Into It With A BT 80

That is nice. Comes with tools also...does it have a cylinder head? Do you know the purpose it was built for?
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  #16  
Old 12-10-2016, 08:18 AM
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Default Re: Cannonballs Back Into It With A BT 80

No cylinder head, one piece jug. Would seem to have it origins in the chainsaw world, but looks like a purpose built or modded version especially for the BT engine. I like the one piece aspect. Sure it may hamper tuning bit it will also eliminate a bunch of issues associated with the CGs jug/head design.

My take on this engine is it was designed to be reliable/durable from scratch instead of a copy of an existing engine. Ill bet its detuned/limited by the exhaust. If its a chainsaw jug, with that type of porting/timing it would probably rip as is with a good exhaust.
This is conjecture on my part, but I do know the ports open more than a stock CGs I have seen. Only putting it on the road will tell.

The funny thing is the # of covers/cases it has each stacked on top of the next layer. All gasketed and fit well(with very thin gaskets). Looks like with a different set of "covers" it could be a pull start only for less $$. That would be my preference.
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  #17  
Old 12-10-2016, 05:52 PM
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Default Re: Cannonballs Back Into It With A BT 80

It's nice to start a well built engine. I agree on the head issue. I remember Kawasaki in the 70's came out with a 100 called , I'm thinking the centurion, it had a chrome bore and was a high revin screamer. I'm anxious for you!
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  #18  
Old 12-13-2016, 07:33 PM
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Default Re: Cannonballs Back Into It With A BT 80

Well its a mixed bag.

Engine is a great runner, smoother than any similar CG I have had. Starts super easy, clutch works great. Has a bit of gear noise like a CG but other wise quieter overall. Good power for not broken in.

Down side the recoil is a weak link. I was in lawn equipment for years. Believe me I know how to treat recoils. On the third ride the recoil broke. I took it apart and a cast in post in the housing broke away leaving the spring unanchored. I fixed that with a threaded post, rewrapped the spring and reinstalled. Quit working on the next ride. This time the starter pawl sheared off. I have requested a warranty replacement from Bikeberry. We will see what happens. I doubt the replacement will be any better. May try to make a metal pawl.

Its a shame the little engine works very well otherwise. May have to go the electric start route which I would rather not. Maybe I should take up knitting.
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  #19  
Old 12-13-2016, 07:47 PM
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Default Re: Cannonballs Back Into It With A BT 80

Naw, you'd get bored quick with knitting.....maybe a transplant pull start...
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  #20  
Old 12-13-2016, 07:48 PM
curtisfox curtisfox is offline
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Default Re: Cannonballs Back Into It With A BT 80

How you going to knit a starter?..........................LOL.....Curt
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