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i have 33cc domes, i need 100 octane. what kind of mixture should i use with 93 and 110?

what would cause multiple threads to strip out of the cylinder while trying to torque the acorn nuts down on a girdled head? i chased the threads before installing the studs, put the studs all the way in and i have now officially stripped out 4 threads (in addition to two existing helicoils)...

I hate to keep asking questions regarding jetting, but ive been trying to get my new motor properly jetted and tuned for a while. im at the point now where it hits very hard every were but off of 1/4 throttle, when i hold it then go wot it makes a distinct gargling or burping sound then clears...

delete, double post

im replacing my head right now and i took a look at the piston wash. How long does it take for piston wash to show a difference, the pistons were showing a lean condition when i bought the motor (all the piston top was dark on each cylinder) the edges are now showing some sines of the dark...

i just got a "thunder cats" girdled head. i have fittings for the tapped out cooling holes and i need a little advise as to what to do with all of these holes. three of the 4 holes are labeled out, one large one at the front of the head , one for cylinder 1, and one for cylinder 2. the 4th...

Awesome seller :arms:, gave me an unbelievable deal on a ported topend with two sets of pistons, girdled head, and two sets of domes. everything was packed great. Thanks alot!

i just bought this head: http://x-h2o.com/showthread.php?t=41343 it is a thundercat head... never heard of it but it was cheap and a deal, from the pics it looks like its gonna be needing new o-rings where can i get some?

i know that putting a jet in the return line restricts the flow, but what is the purpose of this and when would it be necessary to do?

new to me motor, just got everything ready to ride this afternoon and as i went to start it before leaving, it started i reved it twice and it cut off. it would then start if i continued to prime it, and will now only start if i take the flame arrestor off and cover the carb with my hand...

double post please delete

1) when running single carb on 62t cases can i just plug one of the pulse fittings on the case, does it matter which one? 2) paul at lpw just gave me jetting specs for my motor and the 46mm carb, he said full throttle was out of the question for more than 3-5 seconds. How am I suppose to...

I saw a coffman pipe on pwctoday that had a water adjuster in the head pipe like a b-pipe, the seller claimed it hit just as hard as an alike sj with a b-pipe. I asked the guy how he did it and how it works, but got no response. anyone else done this and care to share how to do this mod?

:ugh: http://cgi.ebay.com/ebaymotors/Yamaha-Superjet-FX-1-Jet-Ski-Freestyle-Stand-Up-60-MPH_W0QQcmdZViewItemQQcategoryZ31267QQihZ010QQitemZ200237937217QQrdZ1QQsspagenameZWDVW

im getting these off of a board member, they are carbon fiber, anyone have an idea what kind they are just from the pics?

my ski has been out of commission for 2 weeks with electrical probs, so i decided to go ahead and get a ported 701 and some other goodies to upgrade. while waiting i decided to give it a rattle can paint job, nothing fancy. this is after sanding with 220 grit on rough spots then 400 wet sand...

Just picked this up :headbang: http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=160258105845&ssPageName=ADME:B:EOIBSA:MT:11

here are the symptoms: 90 sj Motor doesnt crank when start button is pressed, when relay is crossed over with a screw driver or starter is connected directly to battery it cranks fine. I have two relays, neither make a difference, each were tested on a battery for continuity ( red to pos...

I just replaced my pump and midshaft, while trying to shim the back of the pump i put bt an 8th'' or a little more of shims and the drive shaft is still not in the center of the hole. Is that much shimming normal? it just seems a bit excessive

i have been having issues with spark on my sj, i replaced the ignition coil and problem was fixed. my battery has also been going dead, i assumed it was time to replace, but after just testing the ohms on my stator my charge coil and pulser coil registered nothing (brown white to black, red...