i was thinking of doing the napa hose mod on my 650 but just wondering if i had to adjust or change any jetting dont want to do either. (past jettingproblems) and agin what is the napa part#. thanx for any help.

 

It is 7335. You probably won't need to rejet.

 

I didnt have to rejet, but any more air coming in and anymore exhaust going out i would.

 

I didnt have to rejet mine but always play it safe and read your plugs (before and after) each mod.I just got my dynojet kit and gona begin my tweeking in the next few days.

 

Would adding a snorkle (DG or Napa) help a p700 that is running lean? A couple of times my p700 backfired through the carbs. It happened on my property and there wasn't a change in elevation. It always seems to happened in colder weather. I thought I read that backfire through the carbs- running lean / backfire through exhaust -running rich. Do I need to rejet or add more air, neither...? When this happened it also sounded weird. For example, when I had it in neutral it would idle and then rev like I gave it gas and then idle. Even if I turned the idling up it did it at a faster pace. Any suggestions or mods the fix. I also thought P650/700 had tendency to run lean. I should check my plugs.

 

Guz,
If the bike is changing idle speed significantly without you touching the throttle, I'd say the float needs adjusted.

Re: your question about more air, I'd say no. That probably would only worsen the problem. If it backfires as you let off the throttle, it's probably a lean condition. Another cause of backfiring that people don't think of is a leaky exhaust.

Hope this helps.
Mark