Wildguzzi.com

General Category => General Discussion => Topic started by: bad Chad on June 20, 2017, 04:40:11 PM

Title: Really tiny valve lash setting?
Post by: bad Chad on June 20, 2017, 04:40:11 PM: I was setting the lash on my 229cc CSC ZenShong today. Its basically a knockoff of a seventies era Honda CG 125cc motor. Very simple, very rugged.

Anyway it took me quite a while to get the gap just right, as its specked at 0.07 mm. The gap can range from 0.07 -- 0.04mm, but to set the gap at 0.07 mm because as the valve wears the gap will shrink. I get that it's a smaller motor, but I recall the big block Guzzi gap at something significantly greater?
Title: Re: Really tiny valve lash setting?
Post by: guzzisteve on June 20, 2017, 04:51:12 PM: Did you re-torque the head too? Go like you are going big side of gap.
Title: Re: Really tiny valve lash setting?
Post by: pehayes on June 20, 2017, 07:25:02 PM: My antique Guzzi Falcone single 500 runs nearly zero-zero. Valve lash improves as the horizontal cylinder lengthens under heat.

Patrick Hayes
Fremont CA
Title: Re: Really tiny valve lash setting?
Post by: oldbike54 on June 20, 2017, 07:58:41 PM: Quote from: pehayes on June 20, 2017, 07:25:02 PM
My antique Guzzi Falcone single 500 runs nearly zero-zero. Valve lash improves as the horizontal cylinder lengthens under heat.

Patrick Hayes
Fremont CA

Yes , and the OP's little motor is OHC , and OHC engines run small valve lash settings .

Dusty
Title: Re: Really tiny valve lash setting?
Post by: Arizona Wayne on June 20, 2017, 08:14:31 PM: My `91 VX800 Suzuki SOHC water cooled V-twin 4 valve clearance is .004" good for at least 18K miles. Right now it has 84.5K miles on it and it still hardly loses any dino oil between oil changes. :bow:
Title: Re: Really tiny valve lash setting?
Post by: Antietam Classic Cycle on June 20, 2017, 09:03:13 PM: Quote from: oldbike54 on June 20, 2017, 07:58:41 PM
Yes , and the OP's little motor is OHC , and OHC engines run small valve lash settings .

Dusty

The CSC TT250 (if that's what Bad Chad's bike is) has a pushrod engine, not OHC.
https://www.cscmotorcycles.com/Articles.asp?ID=293

(https://www.cscmotorcycles.com/v/vspfiles/assets/images/TT250_ValveAdjust19.jpg)
Title: Re: Really tiny valve lash setting?
Post by: oldbike54 on June 20, 2017, 09:27:54 PM: Quote from: Antietam Classic Cycle on June 20, 2017, 09:03:13 PM
The CSC TT230 (if that's what Bad Chad's bike is) has pushrod engine, not OHC.
https://www.cscmotorcycles.com/Articles.asp?ID=293

(https://www.cscmotorcycles.com/v/vspfiles/assets/images/TT250_ValveAdjust19.jpg)

Well I stand corrected then .

Dusty
Title: Re: Really tiny valve lash setting?
Post by: bad Chad on June 20, 2017, 10:27:48 PM: Thanks Charlie.
Title: Re: Really tiny valve lash setting?
Post by: wymple on June 20, 2017, 11:28:33 PM: My GS Suzuki runs about under .002 set correctly. They don't get adjusted (bucket & shim) unless I catch them around .001. That's in inches, the factory calls for .03-.08 mm. My Guzzis have always had many times that clearance.