Greetings gurus! [img]i/expressions/face-icon-small-smile.gif[/img]

I have a new SP 700 with about 3 hours on it. When i took it out for a little test run I opened it up on a nice flat dirt road. The RPM went to around 6,000 rpm's, for 15 to 30 secs, then reduced to about 5,300. I backed off the throttle, opened it back up and it took off again.

Later on it did it again, and backing off the throttle would not clear it. I pulled the choke while riding, felt the engine load up (full throttle) then pushed the choke back in. The engine caught, and took off again.

It seems to only happen when at full throttle for a sustained peroid of time. (30 secs or so)

Any ideas?

Thank you

Craig

 

My first thought was the clutch...maybe. But if you are able to change what is happening via throttle and choke, it sounds like its carburetion / fuel related. Couple things. 1) Check to make sure the rubber carburetor boots look OK and that they are clamped tightly in place. 2) Also, look for the carburetor vent lines leaving the carburetor. Make sure that none of these are clogged or have debris in there -this would cause a fuel starvation in the situation you described. These lines hang down fairly low and are somewhat prone to getting clogged. Even if they are not clogged, now would be a good time to route them higher up on the machine... maybe under the seat somewhere.

 

new machine!

i'd bring it back to the Dealer.

afterall, that's what the warranty is 4.

 

Craig,
My 03 sportsman 700 does the same thing. However, mine always has power again when I let up on the throtle. I spoke to the dealer, but because it is not reproduceable, they had no idea. Please keep me updated. Also, my buddies 03 sp 700 does it as well.[img]i/expressions/face-icon-small-disgusted.gif[/img]

Tim

 

Thats exactly why I have not brought it to the dealer...yet. They don't have a place to open it up near the dealership. I only had it out one time, I will see what happens the next time and try to nail it down a little better. I have a feeling it is in the carb somewhere.

Craig

 

Vegas,
My 04 700 did the same thing when the temp here in PA fell below 40. I replaced the main to a 160 and tuned the air/fuel mix screw out 3 full turns. Runs like a champ now, even decreased the time for warm up. 700's are set a bit lean from the factory. In your case I highly doubt its below 40 in Nevada, however richening it up a bit may be the trick. On the carb near the bottom you will see a brass cover drill this out. Underneath is the mix screw; turn it all the way in, then back out about 2.5 turns. You may have to experiment a bit to get it just right but this worked on mine. One thing to consider I did put a K&N filter in mine so it is getting a bit more air than a stock set-up. If you have the stock filter maybe just 2 turns on the screw may be required.

 

Thanks! I'm pretty good with a CV carb, having rejetted mine on my last Harley several time. I think i will try that if it happens again.

Craig