Planet Minis

davez · 12-12-2007, 06:01 PM

Does anyone know if an 88cc kit for the stock 50 head will work in a 1970 CL70? I'm not sure if the piston (flat top) and cam will work.

fastbmw · 12-12-2007, 06:15 PM

nope, the stroke is all wrong.

fatcaaat · 12-12-2007, 06:21 PM

Nope...piston deck height is too small. Cam design is totally different.

davez · 12-12-2007, 07:00 PM

thanks, kinda thought so, but I can still use the 88cc cylinder right? and what piston would i need for the stock cl70 head?

firepower354 · 12-12-2007, 07:23 PM

PISTON_KIT 52MM_BORE_GBO 81_&_OLDER_HEAD 81_AND_OLDER_CRANK (100042)

BEARING_TYPE RACE_CAM Z50_TO_1981 ATC70_ALL CT70_TO_1981 PASSPORT_80/81 TRX70_ALL XL70_SL70_CL70

That 70 head has 25/22 valves and decent ports. Odd steel cast in chamber and non-bearing cam, but my 180hp GS1100/1425 cams ride in bare aluminum too...

Z · 12-12-2007, 08:34 PM

Quote:

Originally Posted by davez

thanks, kinda thought so, but I can still use the 88cc cylinder right? and what piston would i need for the stock cl70 head?

You can also use the 6V CT70 piston from Trailbikes.

davez · 12-12-2007, 09:24 PM

Great thanks guys

davez · 12-12-2007, 11:31 PM

Z , wouldn't the TB 6v ct70 piston be too small for the 88cc cylinder, or is the Cl70 a longer stroke and same 52mm bore? If it fits , I will go TB.

firepower354 · 12-13-2007, 04:41 AM

TB offers a CL headed 88 kit, so the piston's 52mm and has the right dome and pin to top distance for the early 70 head. TB and DrATV pistons would both work.

12-12-2007, 06:01 PM	#1 (permalink)
davez 2nd Gear Member Join Date: Dec 2005 Posts: 769	CL70 Piston Does anyone know if an 88cc kit for the stock 50 head will work in a 1970 CL70? I'm not sure if the piston (flat top) and cam will work.

12-12-2007, 06:15 PM	#2 (permalink)
fastbmw 2nd Gear Member Join Date: Sep 2005 Posts: 643	Re: CL70 Piston nope, the stroke is all wrong.

12-12-2007, 06:21 PM	#3 (permalink)
fatcaaat 3rd Gear Member Join Date: Sep 2004 Location: Arlington, VA Posts: 3,780	Re: CL70 Piston Nope...piston deck height is too small. Cam design is totally different.

12-12-2007, 07:00 PM	#4 (permalink)
davez 2nd Gear Member Join Date: Dec 2005 Posts: 769	Re: CL70 Piston thanks, kinda thought so, but I can still use the 88cc cylinder right? and what piston would i need for the stock cl70 head?

12-12-2007, 07:23 PM	#5 (permalink)
firepower354 Advertiser Join Date: Oct 2006 Location: Flint MI Posts: 11,002 My Mood:	Re: CL70 Piston PISTON_KIT 52MM_BORE_GBO 81_&_OLDER_HEAD 81_AND_OLDER_CRANK (100042) BEARING_TYPE RACE_CAM Z50_TO_1981 ATC70_ALL CT70_TO_1981 PASSPORT_80/81 TRX70_ALL XL70_SL70_CL70 That 70 head has 25/22 valves and decent ports. Odd steel cast in chamber and non-bearing cam, but my 180hp GS1100/1425 cams ride in bare aluminum too... __________________ If it has my name on it I did it;) FirepowerMinis.com Custom FPM parts and engines. Parts and service for all makes. Honda Trail Bikes parts and accessories. Pitster/Piranha/Thumpstar bikes, parts, engines and accessories. Last edited by firepower354; 12-12-2007 at 07:26 PM.

12-12-2007, 09:24 PM	#7 (permalink)
davez 2nd Gear Member Join Date: Dec 2005 Posts: 769	Re: CL70 Piston Great thanks guys

12-12-2007, 11:31 PM	#8 (permalink)
davez 2nd Gear Member Join Date: Dec 2005 Posts: 769	Re: CL70 Piston Z , wouldn't the TB 6v ct70 piston be too small for the 88cc cylinder, or is the Cl70 a longer stroke and same 52mm bore? If it fits , I will go TB.

12-13-2007, 04:41 AM	#9 (permalink)
firepower354 Advertiser Join Date: Oct 2006 Location: Flint MI Posts: 11,002 My Mood:	Re: CL70 Piston TB offers a CL headed 88 kit, so the piston's 52mm and has the right dome and pin to top distance for the early 70 head. TB and DrATV pistons would both work. __________________ If it has my name on it I did it;) FirepowerMinis.com Custom FPM parts and engines. Parts and service for all makes. Honda Trail Bikes parts and accessories. Pitster/Piranha/Thumpstar bikes, parts, engines and accessories.

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