Give me some KTM performance thoughts

assaultn

Well-known member
Jan 15, 2010
114
60
28
Sherwood Park AB
It was a combination of things. First off they are hacks at Thumper Racing and don't take their time to do a good job, but the other issue is on a wide ratio bike the 520 piston takes out the stock KTM rod likely because you are revving the pi$$ out of the bike in 2nd gear all the time. The CP piston is a really nice piece and was fine, both of them. I loved the BB when the bike was on its wheels because the major gains are down low with added torque, you just keep on short shifting it which is easy on the con rod. On the snow the gains aren't nearly as obvious or useable, its a bit better than stock but not worth the money or drama.

When I bought my first BB Travis was telling me he had tons of BB snow bikes out there, when it blew up it was oh well its a snow bike what did you expect, quote "I don't see how this is my problem" even after they admitted to installing the wrong crank seals. Idiots.


M5
I could definitely see what you are saying about throwing rods if ur ratio ends up having you tapped in second. Very much agree with the marginal gains at that rpm as well. The 520 checks out pretty early on the rpm range. Too wide of a gap from 2-3 to gear down a bit and let it tractor in third?
 

ChrisNeibauer

Well-known member
Aug 5, 2013
1,521
1,588
113
Arlington, WA & Pemberton, BC
Rode 17 450sxf with raze back to back with husky 501fe with raze both 18 yeti ss kits, 501 worked better IMO. Torque monster and revved about as high as 450 with the raze. Coule lazy gear it and still pull tight lines, had some serious vibration at 10-11k rpm but ripped hard. I would never run anything but stock internals for snow. 501 / 500exc motors go forever even strung out. I think 185hrs on stock everything for a few of the bikes, still going strong.
 

Jaynelson

Well-known member
Nov 26, 2007
4,455
4,425
113
Nelson BC
Good stuff thanks! Ya we have a ton of 500 excs running around with a ton of hours and abuse, that’s why I gravitate in that direction