daman
New member
IF needed use OEM Yamaha pistons/rings,like JQ said you may be lucky and just need new pistons/rings,and a light hone on the cyl's, just some pics
of the piston's(walls) and cyl's(walls) is whats needed, try to get some
good one's...
here is your drain bolt for that engine,one for each cyl in the case,you'll
see them good after the exhaust is all off,drain it that way you won't
make a mess and get any down in the case
this is a pic of a triple but it's basically the same place as a twin,they'll
have copper washer's on the bolts
...
of the piston's(walls) and cyl's(walls) is whats needed, try to get some
good one's...
here is your drain bolt for that engine,one for each cyl in the case,you'll
see them good after the exhaust is all off,drain it that way you won't
make a mess and get any down in the case
this is a pic of a triple but it's basically the same place as a twin,they'll
have copper washer's on the bolts
...
daman
New member
In post #24, 4th pic down is that a chip in the wall,by the port??
JohnnyQuest
Member
Just exactly what I expected. Get two new pistons, rings, wrist pins and clips. Get both cylinders honed at a reputable automotive machine shop. Those jugs will hone out just fine.
Now of course for some reason a lot of people here SWEAR by using OEM pistons.... I on the other hand DO NOT use OEM pistons on a rebuild, EVER. But It is totally up to you though. depends on how much you want to spend, and if your in love with Yamaha parts
Now of course for some reason a lot of people here SWEAR by using OEM pistons.... I on the other hand DO NOT use OEM pistons on a rebuild, EVER. But It is totally up to you though. depends on how much you want to spend, and if your in love with Yamaha parts
Yes that is a chip, or it's been warn there pretty good. Is that a problem?daman said:
Where do you get your pistons from? Dennis Kirk, ShadeTree? Not really interested in spending a whole lot on yamaha parts.
Do I need to order piston bearings as well? Do I get the standard size piston? Standard automotive antifreeze 50/50? What about gaskets?
JohnnyQuest
Member
If that is a chip, you'll have to check with your machine shop to see if the location of the chip is crucial. From my expereince chips on the top side of the port like that are not good. Sometimes you can get away with a chip or flake in the bottom side of the port, because it does not effect the compression stroke of the motor. You might be looking at a little more money than you expected with that chip right there, sorry to say!! You will use standard size pistons unless bored, I would order a top end (piston) bearing as well. I usually get the best prices for Wiseco from Dennis Kirk. Get your head and base gaskets through Yamaha!!!!! You can use any glycol antifreeze, I always use Peak Global (Prediluted) antifreeze in everything that I rebuild.
First thing is to get the cyclinders to the machine shop to see what they say. I assume if the chip is crucial they would bore out the cylinder?
horkn
New member
laidt said:
yep, they will tell you if it needs to be bored. wait to hear from your machine shop before ordering psitons, since you will need oversized ones if it needs a bore of any kind. Make sure they tell you the exact overbore they do if necessary. you will need that number to order new pistons.
Good luck.
and I use Wisecos as well, although our 97 600twin has the original pistons, or hopefully the upgraded ones since they had issues with the absolutely original ones. Our venture 6 with the same mill as yours has just under 6k on it now. I have used the cometik gaskets that come in the wiseco kit on many (non yami) sleds in the past with no issues. The wisecos are lighter and stronger than stock. stock are probably cast, and the wisecos are forged.
daman
New member
Thanks for the link. I am going to drop the cylinders off today to get them checked out. Local guy by the name of Bill Bune. http://billbune.com/
daman
New member
Good luck with the project, keep us up to date....
patsxr700
New member
Mann that got hot lol learn your lession to check to oil pump? lol jkk But yea u need a cly. and some pistons :P but make sure that u take every thing out of bade u dont want another piece of alum. to fly up and make a mess again lol
JohnnyQuest
Member
There are no broken pieces of aluminum in this motor, so you're not even on the right page with this problem!!!! The damage was NOT caused by a dislodged piece of aluminum. It was a simple case of a dry seize. There was just enough heat to cause the piston to expand and stick, then the reason it fired back up is because the piston cooled back down and shrunk back to size thus freeing up the motor.
ADVICE: Don't give a diagnosis to a problem that you don't understand patsxr700!
ADVICE: Don't give a diagnosis to a problem that you don't understand patsxr700!
Ready for this. Cylinders were brought into machine shop. Since they are plated, I was told I have two options. First is to get them replated, $225 per cylinder. The second option is to get the plating bored out and use a sleeve, which is also about $200 per cylinder, which he recommended doing in case this ever happens again. He told me that both cylinders need to be done. First off, does anyone have some used cylinders in good shape that they can sell me for cheaper then $450.00. Or even a used Motor? I was also thinking, could I get some aftermarket parts for cheap, use the same cylinders and run the machine as is? Would I get better then the 90PSI compression that I was getting before ripping her apart? Or do I part the machine out? Looking for some advice.
daman
New member
So there saying both cyl's are bad???,, i thought the other one from what i
could see didn't look to bad.
i would not bored out and use a sleeve,,a sleeve cyl. won't dissipate the
heat as effectively as a plated cyl. would, if it was me i would look for a
good used stock cyl.,you can find them now pretty reasonable on here or
e-bay..pick up some OEM pistons/rings and be back in business..
this should not happen again IF you do the repair right, keep an eye on
jetting and the oiling system stays working(witch it will)..
you can be into this repair for decent money if you take your time and
look for good used(OEM)parts...
could see didn't look to bad.
i would not bored out and use a sleeve,,a sleeve cyl. won't dissipate the
heat as effectively as a plated cyl. would, if it was me i would look for a
good used stock cyl.,you can find them now pretty reasonable on here or
e-bay..pick up some OEM pistons/rings and be back in business..
this should not happen again IF you do the repair right, keep an eye on
jetting and the oiling system stays working(witch it will)..
you can be into this repair for decent money if you take your time and
look for good used(OEM)parts...