290 kit for a 08 RMZ 250
Posted September 07, 2008 - 11:41 AM
What kinds of changes would the jetting need????
Would it need cams w/ the 290 kit to really pull me around????
Posted September 08, 2008 - 10:31 AM
I ride an 08 rmz250 To me 3rd gear is to high an 4th gear is so low. Im going to try an play with the sprockets an gear ratio. IMO a 290 kit would be installed after i blow it up an have to do an engine overhaul. In dry conditions the bike is a monster but in loamy stuff I can not compete with 450s
Posted September 08, 2008 - 11:54 AM
There is a guy named Mike S. that installed one on an 08 when they first came out. Maybe he can chime in with some advice. If it pulls down low anything like my yz290f did, you are in for a treat! I had to lean it out quite a bit. I also had a flywheel weight that helped it lug even more.
Good luck to you guys this weekend, wish I could make it. I am pulling for Sheldon to take the championship. You and your wife have raised a fine young man. Good Job Dude.
Mark V. #421
Posted September 08, 2008 - 06:08 PM
Thanks for the kind words.... He's hopping all of the football training will help with his riding. He's pulled tires (24" truck tires) 40 yards over 1000 times over the summer..
They've got him as a 165 lb center and has held his own.. Tuff kid even if I say so....
Posted September 09, 2008 - 12:06 AM
The Yoshi pipe really runs well on along with the BB. It brings some of the lost top end back again, along with overall gains. We tried the Dr Dubach, it only gives the bike top end.
I think the best options if you BB is a pipe and a good head job. The RMZ heads need to be filled along with the port job, contact Ron Hamp on this.
Lastly you could consider a Hot Rods stroker (+3mm) along with the BB. We run this and it works well. All though we need to balance out the crank after the first test run, it wasn't properly done from the factory, and make the bike/engine vibrate.
Posted September 09, 2008 - 02:17 AM
Stock main jet is a 162. I'm running a 160.
My gearing is 13/50. That gearing works well for me. There are lots of threads recommending the 13/50 combo.
Posted September 09, 2008 - 02:28 AM
Posted September 22, 2008 - 08:11 PM
I got the 290 and a 250, no comparision in power, I run a 13 tooth in the front and 48 in the rear and it wheelies in 3rd and 4th without pulling on the bars. I tried a few differnt jeting configurations, I am not the best on jetting but I am happy with 40 pilot, 160 main, stock needle postion (3rd). let me know if you find something else your happy with. I run a DR D pipe and recently switched to VP U.4 and it runs cooler and stronger. I also run a coolant recovery bottle, a 100% necesity in the woods. I like the RLR model but Motion pro has a nice one too. Feel free to contact me anytime if you have questions.
I will be at the NV and AZ National Enduro rounds next month if you will be in the area and want to try it. I could not be any happier with the power output.