BannedCR500Riders.com

Ok so i have a 91 motor with a brand new top end that runs great from idle to half throttle and then when i try to give it more throttle its almost like its hitting a wall and sometimes its makes a slapping noise or rattling noise at acceleration. It starts up great and like i said idles great.

39 PWK

48 pilot

DGJ needle in middle position

170 Main

The pipe is sealed up good the silencer has new packing and the carb is brand new. Brand new Reeds that look great

The airscrew really has no impact as i can turn it quite a bit with no result and it is turns all the way in for the bike to run.

Im getting spooge out the back of the silencer.

Any help would be awesome

who's air-filter do you run?

Roostius_Maximus wrote:who's air-filter do you run?

Twin air with fab one oil

no rag in the air boot?
sorry, I've gotta ask.

plug gap?

Roostius_Maximus wrote:no rag in the air boot?
sorry, I've gotta ask.

plug gap?

Damn harsh Roosty

No definitely no rag in air box

Not sure on plug gap but it is a brand new plug and i was getting same issue with older plug as well. I think its a breg8 if thats right i dont have the bike in front of me right now.

Piston hung on the rod backwards?? Dont laugh... I've seen it on this site 4x now...

dude is already out of surgery an alert!!

AlisoBob wrote:Piston hung on the rod backwards?? Dont laugh... I've seen it on this site 4x now...

Its not that i was aware of that so made sure and it did the same thing before the new top end??? Im stumped

Also Bob glad you came through all right and are back up and raising hell.

Check fuel supply, could be a plugged filter or vent tube.

Got blue spark?

seanmx57 wrote:Check fuel supply, could be a plugged filter or vent tube.

Got blue spark?

Filter is good and carb is brand new and i checked everything

I dont think its fuel related as the problem was there before with the PJ which was a reason to get the 39mm PWK that is on there now but the problem is still there. Let me know guys im really trying to figure this crap out. Thanks alot

So you did pull the line off the carb and verify that you have good fuel flow then?

seanmx57 wrote:So you did pull the line off the carb and verify that you have good fuel flow then?

Yup for sure

Bring it by my house....

So if you have fuel and compression, what's left?

spark issue I'm betting.

Eat your wheaties, bob ain't going to help you kick it

AlisoBob wrote:Bring it by my house....

Thanks Bob thats badass. Its at my buddys house in the desert but when i bring it back i will definitely take you up on your offer of bringing it by and having you take a look. Thanks a bunch i really want to figure this out.

how are the reeds ...slappy rattly noise...check also leaking crank case seal or gasket

craigf40 wrote:..check also leaking crank case seal or gasket

Air leaks lean it out, and make it run BETTER!

Check the fuel tank vent line.

britincali wrote:Check the fuel tank vent line.

That's why I asked if it had good fuel flow, filter or vent line.

a bad CDI ground did that to my bike, the bolt was half out, for some reason it would start great, and run great up to 3500 rpm, where it would hit a wall, sound and feel like it was way rich, spooge out the back too

it felt kinda like when my main jet fell out on my cr 80o