I have the airbox mod and 160, 165 jetting the plugs are tan, a twin air filter and HMF duals it is much faster at the top end but it seems to have lost a little at the bottom. I was wondering if it was the pipe or maybe my belt should be tighter, what are the specs on the V-Force belt for deflection. I hopefully will get the lowend back when I get my EPI clutch kit but it's still on backorder. Thanx

 

I'd say the pipe has changed the power band and a clutch kit with more engagement should bring around the low end.

 

Did you shim the needles like suggested by HMF? That may be your problem.

 

Yes the needles are shimmed, it seems to slightly backfire when I let off of the gas when I'm really on it.

 

sound's like the air screw's aren't rich enough if it backfire's when you let off the gas......

 

Stakk's right. The air screws are adjusted wrong if its back firing. That could also be the causer of the loss of lowend throttle response.

 

Where are the air screws, do you think I'm running to rich.

 

backfire is normally caused by a lean air screw. The airscrews are located on the bottom of the carbs by the float bowls. Their a gold colored flat screw in a recessed hole. Turn clockwise to lean it out and counterclockwise to richen. Turn them about a 1/4 turn at a time. try it then if not right another 1/4 turn til you get it right.

 

The plugs look tan on the electode and blackish at the threads, do you think I need to richen the air screws. Can I do that without taking the carbs out and can I see them when the carbs are in place. Thanx for the help.

 

Help do you think it's the air screws I need to beat my old DS650, I need all the help I can get or do you think my jetting is on and I need to do something with the clutching. Although I don't think the slight backfiring when I get off the gas when I'm on it is normal is it, I mean it did'nt do that with the stock exhaust and jetting. Help guys. Thanx