spurdy

Sorry man, didn't even consider someone running cast pistons. I've always used Wiseco forged pistons and thought most people did as well. Cast pistons don't require as much of a gap due to the process of manufacturing them. Since they are molten and poured into a mold the grains of the metal are allowed to equally settle where as a forged piston is pressed into shape and the grains of the metal are very irregular and produces a lot of internal stress in the metal. A forged piston will swell more when it is heated then a cast piston will. I should have asked which pistons he was using before I gave the tolerances from wiseco. My bad. Shannon

Just about anyone can do a top end on a 2 stroke. Buy a clymers and it will be a piece of cake. When you send the jugs out shipping isn't very expensive and when you put it back together it is no different then rebuilding the top end. You don't have to send the entire motor out to have the porting done. Send out the jugs, have the porting done, buy your parts from the guy you decide to have do the porting, he ships everything back to you and you assemble by following the instructions in the clymers manual. Easy breezy. Lots of people on here to help you along if you run into trouble. Just take your time and follow directions. Don't take shourt cuts, do a pressure test on the motor when it is done, check compression before you start the engine. By the way, porting is by far the best bang for your buck, just plan your build and talk to builders before you start. SP

0.003" - 0.005" or 0.0762mm - 0.127mm SP

Year model really doesn't effect price as much as overall condition. I bought mine used and the frame is powder coated so the VIN cannot be read. The guy thought it was a '96 or '98. He said he had built so many he didn't remember. The only years models I can see effecting price are the J arm year models. Other then that they are pretty much the same. Let me know if you want to part it out. I need a rolling chassis! Where are you located? SP

I had a set on a stock port stock carbed engine years ago and it ran pretty damn good. Pulled hard with stock gearing and 22" tires. Been a long time ago but it ripped. I also put the pipes on ebay a couple of years ago and got around $300 for them plus about $100 for shipping to France. I had the toomey silencers for mine though. Not sure if that matters, I think people use the pipes for something else but there is a market for them. Mine where also black finished like yours. SP

Looks like a T3 SP

THe shift shaft could also be worn out and in need of replacement. The rivet that holds the claw on wears out and the ends of the claw can slip over the pins of the shift star. Or buy the new shift star from "blowit" (i think) that has longer pins on the start the help prevent this. SP

Jeff at FAST sells them also. You could make them out of all thread but the studs are usually harder then mild steel you will find in all thread or similar. The thread is an M8 x 1.25 pitch but I would just go with the replacement studs. I think Jeff gets $30 for them but you could check on his website http://www.farmandsandtoys.com/index.asp SP

X2

Actually, full oil level with debris in the oil could cause the steel to gall and introduce interference between the gear and the shaft. It is likely the shaft may need replacement as well. SP

I would have to agree also. Bearings on a rebuilt crank should be replaced whether they are needed or not. Bearings are relatively cheap comparatively. If all the other bearings still look good then I think that tells the story. A lean condition or improperly mixed fuel wouldn't be prejudice against one bearing. SP

You can't go wrong with Kevin there! He does a super job and is a great guy to work with. Check out his website http://www.herrjugsracing.com/ SP

1/2 revolution

I was wondering the same thing! VF reeds run really well on heavily ported engines. There may be better suited reeds depending on your set up and riding style. SP

A lot of people run 33s and even bigger carbs on stock stroke engines. I had 35s on my last stock stroke ported 350. SP

Absolutely! If the chain breaks again it could bust a hole in the case and then you are buying a new set of cases! I broke a tooth off of a gear one time high in 3rd and locked the tranny up and snapped the chain. That case already had been bitten once before I got it. The case saver prevented further damage. The TM Design is more expensive then the others but I think in this case you get what you pay for. SP

Just took his carb bowl off and checked. There is a hose coming off the bottom of the carb that drains from a pipe inside the carb bowl that is below the carb bore. I also checked Keihin's website and this is called an overflow. He is just running a stock petcock. I am surprised that this could flow enough fuel to fill the case that quickly. Then again, I don't know how long he tried to pull start it either. SP

X2. I have a good sized buddy that used to have a 660. It fit him well. When I would ride it I could never keep the front end down and I felt lost on it. The center of gravity seemed way too high for me @ 6' 175#. SP

Mostly this is due to poor maintenance. Chain too loose, loose axle nut, worn sprockets, engine seizure, etc. A case saver is the way to go. It mounts around the primary drive sprocket and helps to protect your case if the chain comes off or breaks. I run the TM Design but there are several out there. I think the TM Design is best because it is supported by tabs that butt up against the cases itself for support while others are just bolted on and all the stress is absorbed by the M3 bolts that hold it in place. SP

There, I fixed your post so we can decipher your code. :biggrin: SP

Yeah, what's wrong with it? Does it leak? Is it cracked through? If it's just missing the piece from the chain break I would square it up with a die grinder and paint away! I have 2 sets of cases like that. One has been running on my 4 mil for 2 seasons. I have another motor I am putting together for a friend just like it. No worries here. SP

Never heard of it and I'd bet you'd be ok with high octane pump gas. I run Sunoco Turbo Blue. SP

Ouch dude, that sucks. Hope everything comes together in the end. You still gonna make it for Sand Fest? SP

Stock porting and stock head? Could be inconsistencies in the stock casting. Exhaust roof height and dome size also play a part in your compression besides how well your rings seal. SP

But these are Keihin PWKs and they do have overflows. That's what I don't get. At least I think they have overflows. I haven't look at them yet but my PWKs have overflows. SP