center spring question!!

diopwrd · Post by **diopwrd** » Sat Sep 13, 2008 8:47 pm

i got a Sym DD50 with:

-66cc bore
-Keli pulley
-SEF Ramp
-R1 Pipe
-8g weights
-7.4-1 gears

i want to upgrade my center spring and clutch springs for better bottom end...which ones should i go with??? someone told me to go with 1500rpm center spring and 2000rpm clutch springs...is that a good setup?? any suggestions??

PimpinSpree · Post by **PimpinSpree** » Mon Sep 15, 2008 10:29 pm

what does an aftermarket center spring do?

burnt_toast · Post by **burnt_toast** » Tue Sep 16, 2008 3:55 am

PimpinSpree wrote:what does an aftermarket center spring do?

changes your shift band, along with front pulley weight selection.

I would say try 1.5k and see how you like it, I'm running 2k center on my Elite and like it a lot, but felt good with 1.5k also.

PimpinSpree · Post by **PimpinSpree** » Wed Sep 17, 2008 1:06 am

so its sorta like changing to heavier weights on the variator?

Kenny_McCormic · Post by **Kenny_McCormic** » Wed Sep 17, 2008 3:58 pm

It makes the rear pulley shift slower/faster depending on the spring.

burnt_toast · Post by **burnt_toast** » Thu Sep 18, 2008 4:02 am

PimpinSpree wrote:so its sorta like changing to heavier weights on the variator?

completely opposite.. more like running lighter weights. but overall springs and rollers control two areas of transmission shifting and balancing them is key.

maddog · Post by **maddog** » Thu Sep 18, 2008 4:38 am

because they don't sell the sym in the states you must be from hawaii so just call a local shop, the one you got your parts from ha! ha!

PimpinSpree · Post by **PimpinSpree** » Thu Sep 18, 2008 4:09 pm

burnt_toast wrote:
PimpinSpree wrote:so its sorta like changing to heavier weights on the variator?
completely opposite.. more like running lighter weights. but overall springs and rollers control two areas of transmission shifting and balancing them is key.

for some reason i kept thinking heavier weights would shift slower, but now that i think about it. Lighter weights would have to be spinning faster to make the same momentum (or somthing to that effect) I have yet to start doing any tuning on the cvt.

maddog · Post by **maddog** » Fri Sep 19, 2008 3:45 am

we use a trans washer between the ramp & boss, this drops the belt on the front pulley and gives more toque off the line, you can also use shims, you can also use a center spring saver bearing which also helps to dial in the trans just right ! i use both

DorkoElite303 · Post by **DorkoElite303** » Fri Sep 19, 2008 5:06 am

maddog wrote:we use a trans washer between the ramp & boss, this drops the belt on the front pulley and gives more toque off the line, you can also use shims, you can also use a center spring saver bearing which also helps to dial in the trans just right ! i use both

OH MAN! I should have thought of this before! How big shims you using? Any pics?

PimpinSpree · Post by **PimpinSpree** » Sat Sep 20, 2008 9:35 pm

who sells springs?