[kiwi-craig]

KTM make 3 different cams, and hotcvams have a profile.

Go over to KTM talk and check out the RFS engine site, all well detailed there.

KTM talk search = cams

general concensus is tha hot cams lose to much low end in small engine, ktms 8/06 performance cam seems to be a popular choice.

both 450 and 525 share a common lower end crank, rod etc, only difference is the cylinder and piston

you can bolt up a KTM 540 big bore kit, your choice of cams, bore the carb, use the JD jet kit, get a decent exhaust and hold on.......

Intake: this is the same filter as the bikes so would be interesting to see if there is a K&N option, flow restriction will be the anti backfire mesh screen in the stock element base, could be trimmed out.

 

[kiwi-craig]

twin air


on the dirt bikes supposedly adds 1/2 to 1 1/2 hp over the rev range

 

[kiwi-craig]

Is the atv motor identical to the bike? So all engine parts, cams, etc. are interchangable? I would be surprised if they had the same flywheel (oz) and internal gearing ratio.

cases are clearly different as are the gear sets due to the reverse, pity a 6 speed EXC box would be nice.

Flywheel, dunno; something lighter would be good. Would be worthwhile contacting trail tech o see / check, they do a -10 oz for the bikes.......

head over to atvriders:
610 dyno
Crank / rod / top ends are supposedly the same as the 2 wheelers.

stock 525 bore is 95mm 98mm = 543 (KTM hard parts kit) 99 = 554 100 = 565

610 is a KTM stroker crank (see ktm hard parts catelogue) plus 101mm big bore