Any guesses as to why my Magnum will excellerate strong to 20-25 mph than slow right down eventually maxing out around 40 mph. I bought this quad used so don't really know what the top speed should be but I would think it should be 50 ish. After 25 it takes far longer than I think it should to reach 40. I've got a white primary,k&n, and a Supertrapp with 8 discs. Any thoughts would be much appreciated. Thanks

 

Sounds like a bad secondary clutch.The buttons in them have a tendency to break off.Your 425 should run in the 50-55 range.I had one set up like that and it was great.Let me know if this is the trouble.It could also need the valves adjusted or have a bad cam.

 

ftwflh is 'the man' when it comes to excellent advice on a Magnum425!

-MT[img]i/expressions/face-icon-small-smile.gif[/img]

 

Thanks for the advice. I adjusted the valves about 150 miles ago and they seemed to all be good. I thought about the cam but would the bike not run bad all the time if the cam was bad? I havent had a good look at the clutch so I'll definately give it a look. I've thought about maybe going with a team roller or something similar and a 500 HO cam. Any thoughts on that?Thanks again.

 

Before I dropped the $$$$$ on a TEAM I would take the secondary apart and see if anything is bad.Then I would replace the buttons and while I was in it put in a Blue Aaen secondary spring set at 2-2 and it will backshift great almost like EBS.The HO cam would be a good part to put in as long as you found the bigger carb to go along with it.The 425 isnt a powerhouse but it is a tank and very dependable.I put over 6000 miles on one before I sold it.

 

Thanks alot I really appreciate your help. I will have to give it a look this weekend. I was thinking about getting the Aaen carb at the same time with the HO cam. Do you have a recommendation as to what size of carb to go with I was thinking 36mm. Thanks.