davidw2155
05-11-2009, 11:29 AM
I just finished my winter rebuild (I know its almost summer…). I installed a Stage 1 Hotcam and a 450R carb. When I was installing my cam I snapped off two of the three long head cover bolts that bolt into the cylinder (I had a thead on here about it, thanks to everyone who helped with it, http://www.exriders.com/vbb/showthread.php?s=&threadid=391278). So to fix this I had to pretty much take the whole top end apart. Anyways, now I’ve finally got it all together and ready to run and its running like S***. It doesn’t help that my battery is completely dead and I have to jump it every time I start it because my battery won’t hold a charge, but that’s not the problem.
I haven’t jetted the carb yet because to do that I really need to have the cam broken in so I can drive it around and go through the whole RPM range. So I was trying to break in the cam this weekend, I figured the jetting on the 450R carb would be close enough to correct to run, its got stock jetting for the 450R. So I was running it, and it was idling really, really, really high and I couldn’t adjust the carb to correct idle, no matter what I did it would continue to idle really high. The main problem was, and, I don’t know if this was a consequence of idling high or incorrect jetting, but this thing was running H-O-T!!!!!. It was running so hot in fact that it melted my clutch cable that was run between the headpipes…after 30 minutes!!!! I have ran this thing in 100 degree plus heat for hours and never had that problem before the cam and the carb.
I’m just trying to figure out what all I need to do to get this thing running right. I know that running hot means that its probably running lean, so I’m going to order some jets today (And I guess an new clutch cable…) and hopefully play with all that a little this week. But I really don’t know why its idling so high. Has anyone else ever had trouble tuning their 450R carbs or had their quads run super hot after a rebuild like this?
Any info or advice would be greatly appreciated.
I haven’t jetted the carb yet because to do that I really need to have the cam broken in so I can drive it around and go through the whole RPM range. So I was trying to break in the cam this weekend, I figured the jetting on the 450R carb would be close enough to correct to run, its got stock jetting for the 450R. So I was running it, and it was idling really, really, really high and I couldn’t adjust the carb to correct idle, no matter what I did it would continue to idle really high. The main problem was, and, I don’t know if this was a consequence of idling high or incorrect jetting, but this thing was running H-O-T!!!!!. It was running so hot in fact that it melted my clutch cable that was run between the headpipes…after 30 minutes!!!! I have ran this thing in 100 degree plus heat for hours and never had that problem before the cam and the carb.
I’m just trying to figure out what all I need to do to get this thing running right. I know that running hot means that its probably running lean, so I’m going to order some jets today (And I guess an new clutch cable…) and hopefully play with all that a little this week. But I really don’t know why its idling so high. Has anyone else ever had trouble tuning their 450R carbs or had their quads run super hot after a rebuild like this?
Any info or advice would be greatly appreciated.