crf450r

iTrader: (1)

when i take the oil filler cap off im sure i can smell petrol what might cause this??

RA Dunk

piston rings could be fooked

dj219957

im no expert but as above that sounds like piston rings are goosed.

Westwood2006

iTrader: (1)

There's a thing called "bore washing" that happens if your are running rich. Are you mid way through mods and need a remap?

crf450r

iTrader: (1)

done a few mods nothing dramatic though and yes had an open source remap so all should be ok

Westwood2006

iTrader: (1)

What's an open source remap? Any idea if she's running rich?

crf450r

iTrader: (1)

how could i tell if shes running rich

Westwood2006

iTrader: (1)

Smell first off (will give you a clue) but you need to beg borrow or steal meter of some kind.

Also petrol in the oil would be a give away for me! This is bad coz it dilutes the oil.

Did you map it yourself?

fpan

iTrader: (11)

Take it to a rolling road session and measure the AFR

crf450r

iTrader: (1)

no mate it was done at thwaites delovopment in warwick think his name is andrew carr

crf450r

iTrader: (1)

what should the afr read do you know?

Westwood2006

iTrader: (1)

+1 what fpan said.... that's the best way to asses it. You will end up with a graph of mixture versus revs so you can see if she runs rich or lean at various points on the map. Ideally should be a straight (ish) line. AFR = Air Fuel Ratio. Do a search for dyno runs and you'll see some examples.

But keep an eye on it in the mean time. Dont hammer it till you found the cause.

My oil used to smell after about 2500 miles on my old engine. It used to run really rich when cold. I could smell it through the headers (came into the cabin at low speeds) that were vented to atmosphere at the time.

Westwood2006

iTrader: (1)

Dam double posts! But while I'm here see this link for AFR info!

crf450r

iTrader: (1)

thanks for the replies i have a vi performance monitor and im sure it can check afr readings

burbling1

iTrader: (1)

Do you have a VTA dumpvalve fitted?