Mad Powersports
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My RX1 improver seems to be leaving a lot on the table as far as I think.
When I got it there was a 89L belt on it. She started to let go on the second run I made with it. I had a brand new spare 89L off my 600 I put on it. Sat I noticed that after the first run it was creeping forward at idle. 1,500 rpms. But edge the idle up and it won't move until the primary engages. Well after sitting in line to stage I got a whiff of burning belt. Sure as cats have hairballs the primary sheave was hot.
Put a used 89L on it and the creeping stopped. Sheaves cool. So after doing some research Yamaha calls for an 8DN belt. But Geez thats only like an 1/4 inch longer at 44 1/2" where the 89L is 44 7/32". Is that small amount going to make a noticable difference?
I'm now thinking that someone just slapped a belt on it to sell it but it's too short The SOB pulls like a train but just seems to lack the top end. I can't seem to crack the 105 mark. Constant 103's and one good launch with a 104 and change. To be perfectly honest I haven't seen the peak RPMs as I've been busy watching where I'm going. But by my ears it's nowhere near 13,000.
I have yet to see the inside of the chaincase so I have no idea what the gears are there.
Or am I asking to much out of her? This thing seems to have low end grunt up the wazoo but it just doesn't seem to wind out.
When I got it there was a 89L belt on it. She started to let go on the second run I made with it. I had a brand new spare 89L off my 600 I put on it. Sat I noticed that after the first run it was creeping forward at idle. 1,500 rpms. But edge the idle up and it won't move until the primary engages. Well after sitting in line to stage I got a whiff of burning belt. Sure as cats have hairballs the primary sheave was hot.
Put a used 89L on it and the creeping stopped. Sheaves cool. So after doing some research Yamaha calls for an 8DN belt. But Geez thats only like an 1/4 inch longer at 44 1/2" where the 89L is 44 7/32". Is that small amount going to make a noticable difference?
I'm now thinking that someone just slapped a belt on it to sell it but it's too short The SOB pulls like a train but just seems to lack the top end. I can't seem to crack the 105 mark. Constant 103's and one good launch with a 104 and change. To be perfectly honest I haven't seen the peak RPMs as I've been busy watching where I'm going. But by my ears it's nowhere near 13,000.
I have yet to see the inside of the chaincase so I have no idea what the gears are there.
Or am I asking to much out of her? This thing seems to have low end grunt up the wazoo but it just doesn't seem to wind out.