With your setup you should be running 8/06 or 8/33 Cam.
I just ran my 525 on the dyno and got 46 hp. My quad is currently running with bills full pipe, fci intake, 41 mm carb, 12.5 comp piston and an 807 cam. Asked around and found that the cam might be killing my quads bottom end. Im thinking about getting the 833 cam but for now ill be running my quad with the same mods but on a stock cam. What numbers should i expect from doing so and what do you guys think ?
Your help is appreciated
Last edited by steveo525; 02-17-2020 at 01:18 AM.
46 hp? Thatís what I think they make stock. Your build should be making around 50-55 depending on sea level and some other stuff.
1. That cam is WAY TOO BIG!!! If you are a woods rider or like a lot of low end the 8/06 is a good option, if you like the power to be more broad the 8/33 will be the better option. Woods racers would go with the 8/33 for long races cuz the bottom end wears you out less, but for a pure ďI want power and torqueĒ, the 8/06 might be your best bet. I have a built 540 and the 8/33 is just about perfect.
2. Your 41mm carb is getting held back by no head work. +1 intake valves and good porting will do the trick. You need the +1 intakes, if anything else, for reliability. The stock ones are super soft and literally wear so bad that something has to give. Just did an engine not too long ago that they wore so bad it wore so far it broke the tappet bolt.
3. Make sure your timing chain isnít super stretched, it can retard cam timing. If youíre already running an 8/07 AND youíre running a little retarded itís only making it worse.
Other things that kill horsepower are rusty, kinky chains, seizing axle bearings, clutch slippage, intake restrictions....
Last edited by Youngwildandfree; 02-17-2020 at 03:56 AM.
41/42 RWHP on a stock 525XC at sea level.
Last edited by steveo525; 02-17-2020 at 03:47 PM.
Ya sure? I’ll take your word for it. I though the 450 was 42 and the 525 was 46. I couldn’t find any info from a trustable site, I didn’t look hard, admittedly.
Guys are there specific jets for the 525xc quad or can i use any jets i can get my hands on ? Like yfz450 jets because getting ktm parts is pretty tough where i am from
Well thats a bummer thought they made 50 with bills pipe only..
Definitely go with the 833 I run a similar setup hmf comp pipe 42mm carb 13:1 piston 833 cam JD jet kit she is a beast
I would match your build with a 806. 833 if it was a 540 as YWF said. Stock cam won't hurt anything. Any Keihin FCR jets will fit. If I'm in a bind for parts I'll call the Honda dealer in town and they often have parts and o-rings to get me by.
Just a side note: valve spring rates aside, if I remember correctly the head castings vary enough on the RFS heads that some would accept the 807 cam and some needed to be ground down in places to keep the lobes from hitting when they swung around.
2017 Husky FX 450
2009 505 SX
2008 525 XC-modded for mx (currently 450 cylinder)
2009 450 SX
2008 540 XC