Cylinder n piston.

[YamaZuki]

I do not have a piston to measure,i got this jug off of ebay with a head i wanna have re-cut.
The cylinder is in really good shape and my buddy flex honed it for me just a lil and the minor scratches diseapeared.
It measures 66.21 mm. Is that too much?i should just do a 1st overbore huh.
Did i just answer my own question?

 

[sicivicdude]

You certainly answered your own question. If it measures 66.21mm now you'll need to buy a 1st oversize piston and have it finish up to 66.25mm.

 

[YamaZuki]

sweet ty,so i did good, a virgin jug.That is too awesome,much life left in her then

 

[dksix]

.04mm is close, be sure you're getting a good measurement. If you are over that anywhere in the cylinder, it might not clean up for a 66.25mm piston. I would be worried that the cylinder isn't true and round. How and where were the measurement taken?

 

[York Racing]

If your cylinder is out of round by .04 something is wrong.

 

[YamaZuki]

I took a measure at the top of the jug,bottom of the skirts and at the transfer ports,they were all the same.with digital calipers mind youthey only go so deep.Not a propper tool in my opinion but gets me a general idea.Where di the out of round thing come from?hmm
The jug will be going to a local race shop. i will have them do the bore and order the piston i choose for it.Even if i have to go .20 over ,still i am happy with the purchase for a virgin jug.
The head will be sent to KOR when funda provide.
I have a spare bottom end,bad rod bearing,not sure of the transmission health.Need to slpit the cases.Something to do while healing my broken collar bone and can't work.
I just got my ebay and paypal setup so i can liquidate the house to build this beast and become a supporting member here.
I have soo much stuff saved to put on ebay.Parted out motorcycles,not selling ANY blaster stuff.Tons of unused music gear.I bet i could scrape up 600 bux in a hurry.
She runs great now,just putting together a fresh top end.
I already extended the swingarm,i made a thread for that ,check it out,came out sweet.
But,the bad is,i need swingarm and axle bearings,Change my axle,it is bent i have a spare,
And if i am doing a top end i am replacing all the seals to boot.everything i need to. I am NOT gonna put all this into a top end just for something else to fail and blow an engine.
It will wait until i have everything together for it,like i said,it runs now.

 

[YamaZuki]

taht felt good to donate for all i have learned FINALY.i am a procrastinator of sorts lol

 

[YamaZuki]

Here is the swingarm i made.it is straigh n tru and came out at 3.75 inches over stock.
Can't wait to do the a- arms.I have a very limited budget,why buy it when you can build it is my motto hehe
http://www.blasterforum.com/full-rebuilds-128/now-swingarm-50080/

 

[dksix]

York Racing, I was saying .04mm or .0019" (the difference between 66.21mm and 66.25mm) not .040". I would think .04mm wear in the front of a cylinder would not at all be uncommon.

YamaZuki, I bought a rod kit on ebay awhile back for cheap. Figured it would be useful down the road. If you are interested, I would pass the deal onto you. Seems like I got it for around $30 but would have to look back for an exact price. Even if you have to go to 2nd bore, it's still a good find. I bid some on a fresh cylinder and head last week, I wonder if you got it instead? This is the one I was bidding on Yamaha Blaster Cylinder Head | eBay

I looked back at you swing arm, I did mine the same way but haven't gotten the shock mount on it yet. I'm setting mine up with a 400ex shock mount. I got the mount bored for the 400ex shock bearing but don't have it ready to weld on yet. Here is mine

 

[YamaZuki]

Lookin good,i braced mine on the outsidealso, and went long as i could on the inside wall,making it 3 layers thick lol.overkill i know.But why do it 2 times?
The piece i used for the shock mount i took off of a road bike and drilled the extra holes.
On the cylinder i pulled the trigger on a buy it now.
Gotta get funds up first but if then u still have the rod i will let ya know.that wil be sent to KOR also.Ken is close to me shipping will be cheap.