rappy660 Posted March 30, 2014 Report Posted March 30, 2014 Looking for some opinions here. I just rebuilt my engine and changed allot of thing up, and i am now haveing a noticable vibration coming from the motor. I will give a list of before and afters to see if anyone can say if there is a reason for it. Before After stock crank 4 mil 115 rod hod rods 20CC domes 18 cc domes + 4 timing +7 timing stock clutch driveline performance clutch 93 oct 110 / 93 50/50 mix I was thinking maybe becuase of the timing. I did not ride it yet, just heat cycled in the garage. Not sure if it will go away with a load on it. Thanks for any help. Quote
sheerider11 Posted March 30, 2014 Report Posted March 30, 2014 Did you put the dampeners back in staggered on the mounts? Are you running 1988 cases with rotted mounts? Flywheel tight? Quote
Man-O-Steele Posted March 30, 2014 Report Posted March 30, 2014 i think hes refering to where the motor mount bolts go through the front and rear of the cases. Quote
sheerider11 Posted March 30, 2014 Report Posted March 30, 2014 dampeners? wheres that?The kind of D shaped ones Quote
Tony Lopez Posted April 14, 2014 Report Posted April 14, 2014 (edited) I had the exact same issue. The problem is the gas. You need to use straight up 110 only. Mine would vibrate and spit the plugs out. As soon as I started using VP110 only the problem whet away. The issue is detonation or at least it was for me. I run a Cheetah 4Mil with 34 Pjs. email me if you have any questions I did a lot of research on this. [email protected] Edited April 14, 2014 by Tony Lopez Quote
WINDYCITYJOHN400 Posted April 15, 2014 Report Posted April 15, 2014 ^^^^^ WHAT HE SAID! 18cc domes and +7 timing......on mixed fuel? If you put ANY race fuel in your tank....make it ALL race fuel. Quote
sleeper06 Posted April 15, 2014 Report Posted April 15, 2014 Im never a big fan of mixing fuels, we are not chemists. 18 cc domes are alot of compression Quote
sleeper06 Posted April 15, 2014 Report Posted April 15, 2014 Whats the squish at. Static comp? What kind of race fuel, I have ran similar set ups on c-14 with no issues in 300ft but stretching them out longer distances I saw faint signs of deto without a good ignition that retards timing Quote
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