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I have a 2016 Viper with new rods and MPI 180 turbo. I would like to know if the stock 180 clutch weights can be used with different rivet placements. Also what primary and secondary springs and secondary cam did Yamaha recommend in their factory parts list for that 180 setup? Please...

Please Enter Me in the Raffle

On the fence about an MPI outside cold air pick up. When you do finally get the guts to cut your hood, does it really make a lot of air cleaner noise? I remember the old RX1's with air cleaners real well. Thanks, guys.

I have a 2016 Viper LTXDX 137. Has anyone had experience with the new HELO suspension? I am looking for why or why not it would be good for this particular sled. I am strictly a Michigan trail rider. Any hands on info would be appreciated.

I have a 2016 LTXDX 137, build date 5-20-15, serial #121 with 1750 miles. I have an Ulmer clutch kit, weights in the arms, 3-0-3, red primary spring. The secondary has red spring with Ulmer K helix. I don't know if this is an explosion proof motor or not. I have made several primary and...

New motor with old skis

First time out for me this year, 2016 LTX DX. 200 good fun miles. MPI 180 kit, Ulmers clutching with a little problem. My kit came with both red springs and I have a harsh and high engagement, 44 hundred RPM. The top RPM was 8200 which I know will get better. Am wondering if the BOP spring...

Has anyone figured out how to solve the problem of air pressure going up and down in the rear shock? Mine is a 2011 and when you check it with a gauge it will vary 10 to 15 pounds during a ride. In warm weather it really seems to grow air pressure. How do you keep this set so you have it...

I have a 2011 SE, no studs, totally stock, 1100 miles. After 70 mph, it just lays down and quits pulling on top end. On a 1/2 mile run its never hit 90 on the speedo. It engages at 3600, goes to about 10,000 and then creeps up to about 10,400 or 10,500. My dealer keeps telling me it needs...

Has anybody actually used a 42 tooth instead of a 40? It's my understanding that with bigger gears you are supposed to have less rolling resistance. Is there anything measurable by going to these larger gears? Also would bigger rear wheels have the same effect as larger gears in the chain...

I have an 06 RTX stock 121 skid and track. It has the same track scrub on shock problem that everyone has. Has anyone gone to bigger wheels on rear axle? If so is there a problem with tunnel clearance in the back? I would like to go to 7 1/2 inch wheels with a stock axle but this would drop...

I want to gear down at least 1 tooth. I have an Apex RTX with reverse. I've herd 23-38 is working good. Does anyone have any experience with 40 on the bottom working better? I know the bottom reverse gear is high priced but speed costs money. If anyone has any good suggestions I would...

Guys, have you checked your track scrub on top of the rear shock? I have an RTX with 800 miles. The top of my shock and shock mounting bracket is 25% gone. I've painted the track on the inside to see if it was scrubbing with the track way tighter than specs and it still scrubs. I can see...

Does anyone know the clutching differences between an RTX and Attak? The reason I'm asking - I have an RTX that's all stock. My friend has an Attak, all stock, and on top end the Attak is faster. Is there a difference in the clutches on these two sleds? I would think that a 121 should be a...

Has anyone had an Apex or Attak chain case apart? If so, what gears did they finally end up with?

I was checking my primary clutch and found two cracks in the fixed half. These cracks start in the bottom where the two locking keys are. I took the clutch to my dealer and he checked with the Yamaha rep and stated that there would be no warranty because I had overheated the clutch. Has...

I have an 03 RX1 with a HH clutch kit. It has the stock 15MM rollers. I think from past Yamaha clutch experience that 14.5MM rollers could help 0-100 drag racing. The question I have is with the HH arms being just a little shorter can you use the 14.5 rollers without a problem? If anyone has...

Has anybody had two RX1s that ran equally in a side by side drag race and then changed to the quiet White Knuckle muffler on one to see any difference? Was there any change in performance with Freddy's air kit with the same drag race? Or with any other mufflers? Just want to be ready for...

Has anyone had experience with the Hartman quiet muffler? I like their advertised noise level of 1 decible more than stock. Noise is a high priority in our area. Anybody with experience with Bender or White Knuckle or any other brand that is noise friendly, let me know how they work or if you...

Has anyone used the pre-filters yet? Is there any difference in actual use performance with or without? What is the best way to put the holes in them? When using the hoses in front of air cleaners, would cutting them or melting them be the best way? Hope somebody can help me out. Thanks...