07-12-2010, 04:33 PM #1
missing rpm's...timing chain position issue?
hey guys, i need a little input here. i have a 05 rxp that i just built the engine. has a stage 3 charger, 42lb injectors, race ecu, big intercooler, 14/19 solas, RRFPR.
it's only doing 7600rpm's at 66mph but what's wierd is i have the a/f at wot set at 11.7/9 but at idle it's reading like 10 to 10.5?? could my a/f ratio issue be from a possible timing chain off by one which may lead to my missing rpm's??? kinda stumped here. any input would be helpful. thanks guys!
07-12-2010, 06:02 PM #2
I have an 05 that I just rebuilt that is stock with the same issue. It tops out at 7600 RPM. Does anyone have any suggestions?
07-12-2010, 06:39 PM #3
07-12-2010, 07:14 PM #4
- Join Date
- Jul 2006
- Beaufort, SC
yea i agree with psycho
what condition is the wear ring?
07-12-2010, 08:36 PM #5
duke just set up my SC and installed new mcmaster washers so it should be fine. the ecu is a PPG ecu i believe. it's not the riva one. the wear ring is good too and doesn't cavitate at all. feels strong out of the hole but just no top end. definately not a prop issue due to the mph and rpm's. why would yall think the a/f is kinda backwards and running super rich at idle instead of the normal 13 to 14's ratio. that's why i wondered about the timing chain. i did look at the letters being even with the head on the cam gear and it is just a bit slight angle with the crank and cam locks installed. it's never perfectly even????
07-12-2010, 09:36 PM #6
07-12-2010, 10:24 PM #7
Several Sea Doos with low RPMs now. This sounds similar to the problems listed in Snowman's thread.
07-12-2010, 11:02 PM #8
yea, didn't check compression but would think it would be fine as it make good torque but maybe. i did just mess with the chain timing tonight, i got it to move over 1 tooth and now the two timing lines are pretty straight but when i removed the locks, reinstalled the tensioner and turned the motor back and forth to check for freeness, i then tried to double check the marks are reinstall the locks, the crank lock didn't wanna go in. i will try it in the morning to see if it made a difference or not. maybe it will change the way it's burning and get the a/f ratios back to normal.
07-12-2010, 11:33 PM #9
Do you need that piggy back knock sensor harness for your boat? That will cause 7600 RPM
07-13-2010, 12:10 AM #10
im not really sure but i dont think so. the ecu is a ppg, brp racing only ecu.
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