cylinder, piston replacement choices, Poll!

Which way are you likely to (done it) go?

  • cruzin image 2nd over, local bore +-$200

    Votes: 6 25.0%
  • cruzing image 706cc kit, local bore +- $250

    Votes: 7 29.2%
  • 750 kit from YamahaXS650 +- $500 when they're gone they're gone

    Votes: 10 41.7%
  • 750 kit from MikesXS +- $650

    Votes: 1 4.2%
  • Hoos- JE or Wisco pistons, cylinder service, head rework +-$1500?

    Votes: 6 25.0%
  • Hone the cylinder, sand the pistons put in new rings +-$100

    Votes: 4 16.7%

  • Total voters
    24

gggGary

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You were; fogging mosquitos, found glitter in your oil, the front cam chain guide was sitting in the sump, pistons were stuck when you bought it, motor's coming apart, while you're in there, which way would you go?
Go ahead and comment, add choices, detail other work you'd do..
I'm asking cuz I got a stack of cylinders and a local shop that will do my boring, mostly trying to decide 2nd over or 706cc kits for them.
 

jpdevol

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So I just got the Yamaha650 kit - don't even have a motor to bolt it to.

But, if one is going for originality, the big fin thing won't work.....

Depends on the build goals; nothing wrong with std oversize, bored locally. With all the stuff layin' around the SOIR, you could do one of each and post pics:geek:🤪

I'm no help......
 

Mailman

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For me I think it would depend on the bike it was going into and my budget considerations.

For a correct restoration on an early bike…..2nd over stock
If money is tight……2nd over
If money is not an issue……750 kit
Im not familiar with the cruising image 706 kit……..what’s in it? Price?
 

gggGary

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Would be relatively easy to take a die grinder to the fins and make it look just like the originals... if originality lookin' was a concern.
interesting thought.
Hit the tipping point to get going on this when a "local" guy ran up and grabbed my last done ready to go in 2nd over set .
1674164783162.png
 

GLJ

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Would be relatively easy to take a die grinder to the fins and make it look just like the originals... if originality lookin' was a concern.
It would be impossible. Jim look at your BBK and a stock block. You'll see what I mean.
Hint you would loose the vertical post between fins.
I'm building another 750 engine for myself soon. I want it to look stock. I am going with the 750 sleeves and pistons.
I don't just want the fins to look original also want the cam chain tensioner to look original.
Yes it will cost more for the machine work as the block will have to be bored for the sleeves and then the sleeves bored for the pistons.
Piston and sleeves are on sale.
https://yamahaxs650.com/product/big-bore-80mm-piston-kit/
https://yamahaxs650.com/product/big-bore-cylinder-sleeve/
 

Jim

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Hint you would loose the vertical post between fins.
I see what you mean. You could still get pretty close though. Leave the post in place and cut forward and aft from there. Side view would be unnoticeable. As you moved to the front it would be apparent, but I'd guess most folk wouldn't notice. Might not be the exact match you're goin' for, but I think it'd be passable for others (me).
 

jpdevol

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I'm building another 750 engine for myself soon. I want it to look stock. I am going with the 750 sleeves and pistons.

If I'd have a good cylinder and a guy to bore it, I'd buy one of these kits from Hoos Racing and sleeve it to a 750.
View attachment 234058
I think that makes more sense if using a stock cylinder vs spending all day with a grinder. Then your shop floor ends-up looking like this:
20230106_145807.jpg

:laugh2:
 

willis

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Like others have said, it depends on the build. I scored a 750 kit back when they went on sale. It was as great deal for the price. Yes I had to ream out my mount holes but it was worth it. The kit even shipped with an extra set of rings. That was a mistake by the vendor in packaging, but a total bonus. The motor is built but never ran yet. Maybe this spring. I still have the stock parts that came off this motor too, and would be a great candidate for a hone and sand.

I also have a Cruisin Image 706 kit. Also scored it when on sale a while back. It sits on the shelf in the box it came in. I’m sure I’ll get to it someday. It’s good to have options.
 

gggGary

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If I'd have a good cylinder and a guy to bore it, I'd buy one of these kits from Hoos Racing and sleeve it to a 750.
View attachment 234058
Shell/JE750 kits, I carry these in Standard 80m (3.151) , 2nd over (3.169), and 4th over (3.89) . I have these for 447 and 256 motor they are all 10.5 to 1 compression . Pistons kits come with pistons, pins, rings and clips.
http://www.hoosracing.com/new650750engineparts.html





As with all performance parts it is always good to check clearances.





477 motor 74-84


Part# 285495 3.151 bore $365.00
Part# 286317 3.169 bore, $365.00

Part# 285498/360817 3.189 bore, $365.00



256 motors 70-73

Part# 285499 3.151 bore, $365.00

Part# 286310 3.169 bore, $365.00

Part# 332618 3.189 bore, $365.00



Part# LA132 Sleeves 2 for $280



Complete kit with Sleeves, piston kit of your choice and head and base gasket.

Part# 18-2220 $670.00



Part#18-2221 comes with all of 18-2220 kit plus we bead blast, bore , deck head and fit the piston. Kit of your choice $970.00
 

gggGary

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Less than 300 LOL but the 300 is 4 bores with two separate sets of dimensions and I'll assume you need to heat the jugs to drop in the sleeves like stock? .
Have to check my guys current rates. ;^)
 
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MrBultaco

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Yup, 4 bores. You can remove and install the sleeves yourself if you have an oven and a freezer...lots of fun btw...
 
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