There's several stuck piston pusher ideas round here. I've gotten out some severely rusted ones. it is very important to send them both down at the same time or you can damage crank, connecting rods.
-
Enjoy XS650.com? Consider making a donation to help support the site.
XS650.com receives a small share of sales from some links on this page, but direct donations have a much greater impact on keeping this site going.
Which engine is the better one?
- Thread starter scrapmetal
- Start date
Never personally heard of anybody trying the method you suggest. I'm not saying it wouldn't work. Might make a lot of mess, but you would have to be ready for swarf everywhere. And it might be that the pistons are better stuck than most and reluctant to shift.
What usually works is releasing oil, leave it a while, then tap the head of each piston with a wooden drift, typically start with a hammer handle, working around the edge of each one and increasing the level of force until it moves. Have you looked at 5t's patent piston pusher? I guess you have 'coz you've seen his ingenious engine stands.
Good luck!
What usually works is releasing oil, leave it a while, then tap the head of each piston with a wooden drift, typically start with a hammer handle, working around the edge of each one and increasing the level of force until it moves. Have you looked at 5t's patent piston pusher? I guess you have 'coz you've seen his ingenious engine stands.
Good luck!
scrapmetal
XS650 Addict
yeah, tried all kinds already, I'll keep on going, drilling the pistons is my lat option!
scrapmetal
XS650 Addict
off for night-shift today,
working on seized motor, no chance to move the pistons, found out the reason the starter where in a box, homemade plug, hard plastic with a bolt thru the case cover, not too bad, the starting gear still in the lower case,
working on seized motor, no chance to move the pistons, found out the reason the starter where in a box, homemade plug, hard plastic with a bolt thru the case cover, not too bad, the starting gear still in the lower case,
Attachments
Wasn't HE clever!
scrapmetal
XS650 Addict
Hey Gary,
A kind of clever or smart?
Have you seen the picture with the extended clutch spring? What was the idea behind that?
Think now this guy knowed what he did, maybe on a low budget,
I remember bought this motors 10 years ago in Ontario, Owen Sound the guy had some other bikes, English bikes in his amazing two story heated barn, I was impressed,
Was a long hauler that time, Canada USA, stopped on the way home to Nova Scotia, load the 3 engines behind the Cab between the tractor trailer, on studs secured with a couple ratchets straps, never forget that, still have the phone number, may I call him some day
A kind of clever or smart?
Have you seen the picture with the extended clutch spring? What was the idea behind that?
Think now this guy knowed what he did, maybe on a low budget,
I remember bought this motors 10 years ago in Ontario, Owen Sound the guy had some other bikes, English bikes in his amazing two story heated barn, I was impressed,
Was a long hauler that time, Canada USA, stopped on the way home to Nova Scotia, load the 3 engines behind the Cab between the tractor trailer, on studs secured with a couple ratchets straps, never forget that, still have the phone number, may I call him some day
scrapmetal
XS650 Addict
So every engine, every bike I ever owned have there own story,
You guys may have the same background with every bike you owned,
Would be a idea for a thread?
You guys may have the same background with every bike you owned,
Would be a idea for a thread?
Hi Scrapmetal, I thought so too, so I started this thread:
http://www.xs650.com/posts/606400/
I could easily add stories about probably most of the bikes I've owned.
Didn't find it.
On pushing pistons; make your pusher so it connects with the outer edge of the piston, the crown is thin and can be shoved in, not that it matters to the piston but it won't move the piston in the cylinder. Need to watch that you don't keep pushing after the crank has reached BDC! At some point you need to block up the cylinders to keep pushing the pistons out.
scrapmetal
XS650 Addict
done!
had a nice conversation in German and English with the sized Motor,
the conversation, soaked in mystery oil for a couple days, heat from the torch, some gently touches with the hammer on the hardwood chisel,
RESULT: apart without further damage, BINGO,
talked with my buddy, he owns a bike shop, quads etc. he will drill the cylinder for the next oversize pistons,
pic 5 shows the damage lower case I'm replacing with he case from the sized motor, pic 6,
pics 7 , 8 and 9, working on the engines without having a motor stand
had a nice conversation in German and English with the sized Motor,
the conversation, soaked in mystery oil for a couple days, heat from the torch, some gently touches with the hammer on the hardwood chisel,
RESULT: apart without further damage, BINGO,
talked with my buddy, he owns a bike shop, quads etc. he will drill the cylinder for the next oversize pistons,
pic 5 shows the damage lower case I'm replacing with he case from the sized motor, pic 6,
pics 7 , 8 and 9, working on the engines without having a motor stand
Attachments
For reasonably priced oversized pistons, check out cruzinimage. They also sell on eBay .....
https://www.cruzinimage.net/2017/08/17/yamaha-xs650-0-5mm-oversize-pistons-set-447-type/
https://www.cruzinimage.net/2017/08/17/yamaha-xs650-0-5mm-oversize-pistons-set-447-type/
scrapmetal
XS650 Addict
Hey, 5Twins,
how do I know what size I just removed in the seized cylinder? may the previous owner put a oversize in it already?
there are no stamps on the top, one have a stamp # 3 the other have 4 inside the body wall, diameter I measured is around 75mm.
thanks in advance,
Scrap
Stock bores are just over 75mm, stock pistons just under. On a stock piston, there is a 3 digit number stamped into the top, but you'll have to clean the piston off real good to see it .....
The 3 numbers represent the fractional part of the piston size, as in 74.xxx mm. The 3 numbers replace the 3 x's. But your piston tops look a bit flattened out, maybe from pounding on them, so maybe the numbers won't show any more.
Oversize pistons go in 1/4mm steps. 1st oversize would be 1/4mm bigger and have a "25" stamped on top. The ones I linked to are 2nd oversize or 1/2mm bigger. They would have a "50" stamped on top. If you can't find any number markings then your only recourse would be to measure them. The stock piston in my pic above new was 74.953mm. All I've seen are very close to 75mm, like in the 74.9xx range. That means even the 1st oversize (.25mm) would put the size over 75mm.
The 3 numbers represent the fractional part of the piston size, as in 74.xxx mm. The 3 numbers replace the 3 x's. But your piston tops look a bit flattened out, maybe from pounding on them, so maybe the numbers won't show any more.
Oversize pistons go in 1/4mm steps. 1st oversize would be 1/4mm bigger and have a "25" stamped on top. The ones I linked to are 2nd oversize or 1/2mm bigger. They would have a "50" stamped on top. If you can't find any number markings then your only recourse would be to measure them. The stock piston in my pic above new was 74.953mm. All I've seen are very close to 75mm, like in the 74.9xx range. That means even the 1st oversize (.25mm) would put the size over 75mm.
scrapmetal
XS650 Addict
that helps, thankyou
Note: the normal "needs a bore" Cruzinimage piston is a 2nd oversize, 75.5MM
706cc kits also available... It's trickier doing the 706 bore cuz that's about the limit for the liner.
scrapmetal
XS650 Addict
Hi
What do you think about the big bore kit 705cc?
Need the bore anyways, why not go something bigger, and its nod a bad price at cruzinimage, what else do I need then?
scrapmetal
XS650 Addict
scrapmetal
XS650 Addict
Just asked the question!!
Thanks
Thanks
scrapmetal
XS650 Addict
Need to talk with my buddy what he think about the 706cc,
The cylinder sleeve wall is getting pretty thin
You said: it's the limit
The cylinder sleeve wall is getting pretty thin
You said: it's the limit
