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I always had a problem with that method of truing cranks, if you put your dial indicators right above your point of contact in the v block, or the rollers in this case, most of what your measuring is roundness of surface your indicating on. To measure runout with this method you have to offset...

lol yeah, and on saturday I was first other 701 was second 650 never ran, but the same guy got on someones sxr to run around the course for fun, end of saturday I cracked a piston in half at the end of the holeshot in the second ski lites moto so couldn't run vintage or ski lites on sunday.

Yeah that picture you sent was the only rules I ever saw about it. I did go and race with a piped, ported 701 in a sn hull. nobody showed up on a js hull and there were two other superjets, one stock 650 and one 701 that was more built than mine lol. It seems pretty relaxed, but I'm wondering if...

Can put a dial indicator on the pistons and run the motor over tdc to make sure there's no dead spot.

Nice, I've been saying I was gonna do this for a long time now, still hasn't happened lol.

If your cable had 3-4ohms that was probably your problem.

Might be more likely that your battery is fine and your starter is going bad, making it crank slow and draw a ton of current. If you have a multimeter you could check battery voltage and starter motor resistance

Pump can go out and in at any point, easiest to pull the motor and the ebox at the same time and keep them together because the stator is hard wired into the ebox. Just put the stuff in the new hull in the opposite order you took it out of the old one. It wont take long if you have everything...

you could always use a piston ring compressor, or a make shift one like two beer cans with the zip ties around them if u don't have a real one

Just to not totally blame the wsm pistons, I did measure that blown up motor, the non cracked piston was 3.187" like its supposed to be. The cylinder clearance was .010" at the tightest, .017" at the loosest. The out of round was most likely from the piston slapping around, but there's no way it...

I run ProX in my dirtbike, I think its better for the plated cylinder, In an iron sleeve I think the stronger forged piston may be beneficial despite its higher CTE. I think were getting a bit off topic now though. For the original question I think all I meant to say is you never really know...

I will when I put the new motor together, luckily I have a spare ported 61x motor that came with the ski. I doubt the squish was too tight though it only read 165psi on a good gauge when it was running good, never noticed any detonation. I just checked, (ski only blew up on saturday and I was...

Well once you shear your key the timing is way off

I got a 99 yz250 if ur interested?

The sheriff at our lake thinks it’s cool to see people doing backflips, on the other hand one time the nys “park police” were at the launch and gave us a bunch of tickets for nothing, got them all thrown out in court but it sucks burning up hours in the court room for bs tickets, honestly would...

Mine just cracked the skirt off the front piston, it had the same stuff done to it, I bought it with good compression this spring and probably only put 10 hours on it, I just swapped it to another hull and looked at the pistons through the exhaust port when I did that, they looked fine, that was...

Thanks for the reply, So can I bring a 90-93 squarenose that had a 701 swapped in with a bunch of mods or it still has to be a 650 motor at the heart of it?

Is there any rulebook for the vintage open class in east coast watercross? I'd like to know what I can do to my 650 square nose, can I put a pipe on it? I don't see anything in any of the ijsba rulebooks about the vintage class, and east coast watercross does not seem to have their own rulebook.

I have one with a hole in the side but I'm kinda far, I might be able to send it to virginia with a buddy of mine in two weeks though. I just finished swapping everything out of it to a different hull after that same buddy crashed into it and put the hole in the side lol.

I just measured a stock aluminum prop, its m20 x 1.5