What kind Spacers for belt tension?

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bco2jco

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Feb 5, 2007
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central ny
I want to add spacers to increase the belt tension on my 2 sleds (600 venom, sxr700). They seem to be overrevving a little, 9000rpm on the 600, less on the 700. The belts are in spec, but sit a little low in the sheave.

Question is: Can I use regular washers from the hardware store, or do I need to get these spacers from the Yamaha dealer. Thanks.
 
If it's over rev on top, it's not the 3 washers on the back side of the secondary. The washers will adjust belt deflection at idle and put you in the "lowest gear" from the start. You can use any washer that has the right size hole and correct thickness. The belt should sit just a touch above the secondary. Belt width is dead at 33.5mm (performance is lost before it gets to that point). I would buy/borrow a new belt first. A warn belt will also cause over-rev, as well as any belt slip. Clean your clutches as well with a scuff pad and acetone. Check your secondary spring as well, make sure it's in spec and is in the correct holes. Doug
 
should the secondary have a 1/16 or 1/8" play back and forth? Had to take mine off to clean out a destroyed belt at 170km/hr and didn't notice if there was play before I took it off. I was told a small amount of play was normal but just wanted to confirm.
 
NY_SXR700 said:
If it's over rev on top, it's not the 3 washers on the back side of the secondary. The washers will adjust belt deflection at idle and put you in the "lowest gear" from the start. You can use any washer that has the right size hole and correct thickness. The belt should sit just a touch above the secondary. Belt width is dead at 33.5mm (performance is lost before it gets to that point). I would buy/borrow a new belt first. A warn belt will also cause over-rev, as well as any belt slip. Clean your clutches as well with a scuff pad and acetone. Check your secondary spring as well, make sure it's in spec and is in the correct holes. Doug
Click to expand...

Ok. I have to admit to not having a real understanding of clutching. I can do what you described though.
I will clean clutch and belt. I have 4 belts (all used) so I will swap out the best one first before I pry open my wallet and but a new one. I can check that the spring is in the correct holes (I have the service manual so I will follow instructions there). How do I check if the spring is "in spec" though? Or are you referring to making sure it is in the right holes. Thanks for your help.
 
You really can't check to see if it's still "springy" enough. Just make sure it's in the stock holes. If you bumped it to a tighter tension it will fight the primary and not open enough, thus over rev, and heat build-up and belt slipage.
 
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