compression values

[raptorobbie]

I was just on DRR's website looking around and under the Tech section it listed compression values for the different years. Mines an 08 90cc and DRR says it should be "approx 180psi" w/ throttle wide open. Is anyone getting values that high on a stock engine?? My engine is having trouble getting off idle - so I did a comp check and I'm only getting 100 psi - so I know its low but omg I didnt think it was that low. Any feedback is appreciated!

Thanks!


rob

[etondaddy]

100 psi cold is no good......that's about 80 to 90 hot. Time to rebuild.


Mike Kozura

[Team-Ty]

seond that!

rebuild is a must! If I recall correctlt you need at least 80psi to fire and engine which your pretty much there (aint good)

[raptorobbie]

thanks - yes the comp is low and the bike fires and idles - it just doesnt want to get off the idle circuit.

The real question is - should the bike be at 180psi like the DRR site said or am I missing something?

[Team-Ty]

Guy scorrect me if I'm wrong here but I believe there is 2 types of heads out there one that is around 180PSI and the pther that is lik 130-140PSI. depending on which one you have.

[thequadfather+2]

2009 '90 @ 140 psi brand new. Bought in March this year @ Hot Quads. Still holding at 140.....