250R Is Running Awful

[PYF]

Small update for future informational purpose:


I solved my problem. The machine is now fast :devil:...It was only foulings plugs so when I was trying with a good jet, the machine would still not performs since the plug was fouled...

SETUP 1 I TRIED

162 Main jet
50 PIlot Jet
3th position Needle


OK this setup ran good but was still hesitating on top end, at least the quad was performing AS GOOD as before the rebuild and porting (Not really fun but at least it's working)


SETUP 2

155 Main Jet
50 Pilot Jet
3th Position Needle

Wow Now the bike is getting really faster. I know see a difference. Revving a lot faster and a lot funner to ride ...My rear tires have about 75%+ Treads left and I crashed when I lost the rear end because of excessive wheel spin :huh ...I think I'll need new tires otherwise it's going to be dangerous lol

Sadly, when I crashed, I totally shot my right outer front wheel bearings lol :ermm:

The quad still bogs a little on top end with a 155 but I rather not go too lean right now and not do too many plugs chops since I'm still on broke-in...I did a small plug chop and looks like I could still jet leaner but it's gonna stay at that for now...


THANKS EVERYBODY FOR YOUR HELP,

Pierre-Yves

[fourtrxrdr]

I had the same exact problem.
Had a new bore done, bigger piston.
Cool Head. It always started first kick, and idled fine, but more than half
throttle---- bogged out. I had the stock carb on it.
I picked up a 38 mm carb and am back to 20:1 gas mix ( I too was running rich for break in). I also use a ngk br8es plug instead of the recommended 9es plug.
Now, runs smoooooth! Wide open it feels like it wants even more.