07 650i BF had a HMFslip on put on then a performance cdi under seat with atv mod. then i put a dynojet kit then it all went down hill..it sputters between 8 to 15 mph if i open the throttle it clears up,main jet are 136 and 140 (had a local shop do kit) and the washer set on 5,what should i do???<span class="FTHighlightFont"></span ft>

 

Trash the dynojet kit or atleast pull it out of the bike. Run the stock needles with 1 shim under each needle. Use #4 brass washers from Home Depot or Lowes to shim the needles. The washers fit perfect and are the perfect thickness. Use keinin - stock mains. Take the rear main and put in the front carb and go 1 size larger for the rear carb. Most people don't like to hear that the dynojet kit they just spent money on isn't the way to go but it's the truth. If you will go with the stock needles shimmed and 1 size larger main in both carbs I will just about guarentee you you'll be screaming down the road instead of popping and studdering.

 

hmf says for my bike its 165for the front and rear (keinin of course)so what size should i get?i called local dealer shop and they said both front and rear are 155.. and hey! thanks for all the good tips you have helped me out very much!!hope to hear back soon P.S yes dynojets are JUNK!!

 

If HMF recommends 165 then go ahead and go with what they recommend. I'm sure they've done the dyno testing and know the best combination for the majority of bikes out there. Not a problem I hope you get it all lined out.

 

thanks for all your help..!!!!ride hard and have fun!

 

on my 07 brute force they say 155 are in both carbs stock ,so what size should i go with?i have the stock needles in,and should i change the spring back to stock that covers the needles?[img]i/expressions/face-icon-small-confused.gif[/img]

 

160 mains and put the stock springs back in

 

will give it a shot...thanks...