compression is 195 too high?

[STINKYDELUXE]

is 195 and 190 psi too high? the reason im asking is because my plugs are backing out, like 5 time a day at the dunes . i run 110 octane and it runs great but something has to be wrong.

[fastbanshee8]

Is your timing advanced? If so, how much?

[okbeast]

Plugs backing out usually means it's getting a lean detonation. You definately should NOT run it after this happens. Check your timing, check for air leak, check your jetting, etc.

[STINKYDELUXE]

im running a 10 mil stroke with a supercub, 25cc head the timming is at 7 although im thinking alot about running 8, cpi inframe pipes, 39 pwks

the running temp is around 180 - 200

[moneybags]

What size jets are you running? You should do a leak down test befor you ride it anymore. Better safe then sorry. Definitely dont up the timing if it is pushing the plugs out now... From what I understand 185psi is about all you want to run for compression.

[shanYE west]

I was running 195-200lbs on mine with 13 on the plate.. but i'm running alky too..

 

Like okbeast and moneybags said.. i'd do a leak down and if that passes... you must be lean your jetting..

[sheefreak]

Where did you get your domes? Did you have them cut? What is your squish at? I ran a gas motor at 195 psi for two seasons...I did back out the plugs on a couple occasions, but the few times, something was not right(lean jetting, and had oring sealing problem causing a coolant leak). And as mentioned, definately don't up the timing till you get it straightened out. Oh, and one other question. Are you running a stock cdi?

[STINKYDELUXE]

I'm running a stock cdi. I got the domes from rdz they said 25 on them. i didn't check the squish , how do you check it?

[rubberneck]

What jetting are you running in your 39s pilot/needle/ clip on the needle and mains?

[Snopczynski]

Obviously its not a good idea to go to +8 timing if your backing the plugs out at +7. Yes it sounds like its too much. Hard to say exactly without some squish numbers to back up the suspicion. Another option is to track down some 114 octane.

[STINKYDELUXE]

im trying to get a friend to check the squish. im in Kuwait right now. what kinda squish number should i be hopeing for? I dont rember what jets and needles we used.