Planet Minis

Chuckfp · 10-02-2008, 09:24 AM

Have a 1971 CTKO model, recently rebuilt top end with all OEM honda parts including Honda "Hot" cam. Marginal improvement only. I live in hilly areas and just need more power as 25mph (2-up) on a 40 mph road isn't cutting it. Here's the question - I have a late 90's XR70 engine which I can beef up to 108 cc or is it better to just buy a new Chinese engine and pop that in? Whatever choice I make it must be a semi-auto (no clutch) as my wife drives the bike occasionally. I can keep my original engine for resale later (if ever). I also want to use my original exhaust to keep the stock appearance and I know that I'll have to deal with a lighting coil and 12volts in either of the replacement engines. Gurus, your advice please.

RLucky82 · 10-02-2008, 09:29 AM

Pitster is selling the 90cc autoclutch with E-starter for 295$ and is a direct bolt in. and should have the power you need.

edit: oops I was thinking of the xr75 vertical engine (never mind)

firepower354 · 10-02-2008, 05:42 PM

88 kit, some valve seals, and an AHP 4 speed, on the XR70 mill would be my choice.

10-02-2008, 09:24 AM	#1 (permalink)
Chuckfp PM Newbie Join Date: Jul 2008 Posts: 2	Replace KO engine with XR70 or Chinese? Have a 1971 CTKO model, recently rebuilt top end with all OEM honda parts including Honda "Hot" cam. Marginal improvement only. I live in hilly areas and just need more power as 25mph (2-up) on a 40 mph road isn't cutting it. Here's the question - I have a late 90's XR70 engine which I can beef up to 108 cc or is it better to just buy a new Chinese engine and pop that in? Whatever choice I make it must be a semi-auto (no clutch) as my wife drives the bike occasionally. I can keep my original engine for resale later (if ever). I also want to use my original exhaust to keep the stock appearance and I know that I'll have to deal with a lighting coil and 12volts in either of the replacement engines. Gurus, your advice please.

10-02-2008, 09:29 AM	#2 (permalink)
RLucky82 3rd Gear Member Join Date: Jan 2007 Location: Medina Ohio Posts: 1,852	Re: Replace KO engine with XR70 or Chinese? Pitster is selling the 90cc autoclutch with E-starter for 295$ and is a direct bolt in. and should have the power you need. edit: oops I was thinking of the xr75 vertical engine (never mind) Last edited by RLucky82; 10-02-2008 at 10:10 PM.

10-02-2008, 05:42 PM	#3 (permalink)
firepower354 3rd Gear Member Join Date: Oct 2006 Location: Flint MI Posts: 6,242	Re: Replace KO engine with XR70 or Chinese? 88 kit, some valve seals, and an AHP 4 speed, on the XR70 mill would be my choice.

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