Changed pipe back to stock, now bogs down when warm and dies

[350cc]

Hey guys/gals.. As stated above, I've got a '90 DR350 and bought it 3 months ago w/ a Cobra exh already on it (too loud)

So I swapped it for an OEM stockie from the same bike, and now it starts, but when it warms up (4 min) it bogs, dies and then I have to wait 20 min for it to start again.

I installed a stock main jet (35 from 45) and it still runs like this.

Any ideas/ comments?

Oh, and the bike ran perfectly with the Cobra exh :bang: it was just too damn loud.

 

[wake_rider]

It sounds like as your bike gets hot and the air isn't as dense due to the raise in temp, your mixture air/fuel mixture just isn't right. You're going to need to slowly jet down on your pilot and main jets. Are you running the stock intake?

 

[350cc]

Thanks for the reply

So if your theory is correct in regards to the less dense air, then I would be running too lean.. that scares me. I beleive my intake is stock (it may have a K&N in the airbox but that would be it)

 

[76GMC1500]

Swap the Cobra back just to confirm it's the pipe that is the problem.

 

[350cc]

*** That's the part I shot myself in the foot with.... I traded pipe for pipe w/ a guy on craigslist and now I only have the OEM one (which by the way is like $370 on bikebandit new) :ohmy:

But I am 99.9 % sure that it is the muffler change that is causing me issues.

 

[76GMC1500]

Check the packing, if that checks out ok, move on to the carb float, it may be stuck and not admitting fuel quickly enough.

 

[350cc]

How exactly would I go about checking the packing? And this may sound crazy, but if I am low on fuel could this cause what is happening? I'm probably down to a quart or so..

 

[whenfoxforks-ruled]

Have you checked the plug to SEE what the engine needs??? Theorizing till the cows come home,have issues,look at the plug! Wet:too much fuel,dry: not enough!

 

[125rmcrazy]

not wet/dry!! color. black is rich, white is lean. color should be a nice golden tan brown.