YPZ Clutching

jefflanthier · Post by **jefflanthier** » Mon Mar 31, 2008 7:37 pm

Just curious if anyone has a cure for myYPZ primary clutch thats on my Vmax Its going to 7500 7600 RPM has anyone ever tried to get one of these clutches to turn 8200 it has 8vo weights in it and the spring is off an exciter i believe! it engages really low 3000 rpm or so. I,m,m tempted to drill or grind holes in the weights to lighten it up but wondering about a spring idea. Any input would be appreciated

joes · Post by **joes** » Wed Apr 02, 2008 12:58 am

According to the VMAX manual, a 0.050 spacer on the end of the spring raises the engagement point 200 RPM. I added a 1/8 inch spacer to mine and it raised the engagement point by 500 RPM.

Shimming the spring is easier than grinding the weights and much easier to undo if the experiment is unsuccessful.

Joe · Post by **Joe** » Fri Apr 04, 2008 10:57 pm

The COMET tuning manual says you can install up to three spacers on the fixed end of the spring.

jefflanthier · Post by **jefflanthier** » Sun Apr 06, 2008 7:28 am

I,m gonna try shims i think to see if i can find the rpm i need, figure out how thick they all are and buy or make 1 shim that size. I do have a P 85 as well and might use it now that winters over i have lots of time to experiment. Tks guys

sxr1000 · Post by **sxr1000** » Sun Apr 06, 2008 12:38 pm

Jeff yamaha never made a spring that was stiff enough for the ypz clutches, I think that is why the never used them on the v max,you may have to use another brand that will fit,seems to me skidoo springs are the same size.

jefflanthier · Post by **jefflanthier** » Sun Apr 06, 2008 4:31 pm

Ski doo eh! I will have to check that out do some measuring! tks

jefflanthier · Post by **jefflanthier** » Mon Apr 14, 2008 8:59 am

does anyone know if the 1981 srx spring will fit in the ypz clutch, it almost looks like the same clutch in the microfiche online.

VintageVmax.com

YPZ Clutching

YPZ Clutching

ypz springs