JE rebore PHUK! Hilfe!

[honkdawillydahonk]

JE do recommend much looser piston to bore clearance than Yamaha do for thier standard parts - Make sure you get this right or it'll smoke like fook or seize!

[Killerwhale]

JE do recommend much looser piston to bore clearance than Yamaha do for thier standard parts - Make sure you get this right or it'll smoke like fook or seize!

Dude said he will set it somewhere 5-700...
They do all motorwork for Suzuki GBG and "Kenneth´s" so they should know what they are doing.....but with my luck.....

[honkdawillydahonk]

JE do recommend much looser piston to bore clearance than Yamaha do for thier standard parts - Make sure you get this right or it'll smoke like fook or seize!

Dude said he will set it somewhere 5-700...
They do all motorwork for Suzuki GBG and "Kenneth´s" so they should know what they are doing.....but with my luck.....

Is that what JE recommend though?

[madivi]

JE do recommend much looser piston to bore clearance than Yamaha do for thier standard parts - Make sure you get this right or it'll smoke like fook or seize!

I had my SRX rebored and fitted a new forged piston (Wiseco).
Was astonished to realize that clearance was bigger than for the stock casted one.

One of my basic beliefs is, that forged pistons expand more evenly then casted ones and are therefore better.
What is your knowledge or experience as to this?

[Killerwhale]

JE do recommend much looser piston to bore clearance than Yamaha do for thier standard parts - Make sure you get this right or it'll smoke like fook or seize!

Dude said he will set it somewhere 5-700...
They do all motorwork for Suzuki GBG and "Kenneth´s" so they should know what they are doing.....but with my luck.....

Is that what JE recommend though?

The JE reseller says so, and i REALLY hope they don´t say something else...

[DOBBO]

They should measure the pistons and then bore to suit each individual piston as they all vary slightly. Clearence then should be set to piston manufactures specs i would imagine.

[Killerwhale]

And BTW, if You're contacting JE, ask them what ring gap clearance should be. I didn't bother, just set it to Yamaha Standard, but it might have been wrong...

Hey, just got word. Ring gap should be 1/10 to 1/30mm

...but you could explain a bit further....and is this measurement other than standard ones?

[phuk72]

They should measure the pistons and then bore to suit each individual piston as they all vary slightly. Clearence then should be set to piston manufactures specs i would imagine.

yeah - that's what happened when I had mine done

And BTW, if You're contacting JE, ask them what ring gap clearance should be. I didn't bother, just set it to Yamaha Standard, but it might have been wrong...

Hey, just got word. Ring gap should be 1/10 to 1/30mm

...but you could explain a bit further....and is this measurement other than standard ones?

I'll check my JE box tonight - I wrote the gaps on that

[HansJ]

And BTW, if You're contacting JE, ask them what ring gap clearance should be. I didn't bother, just set it to Yamaha Standard, but it might have been wrong...

Hey, just got word. Ring gap should be 1/10 to 1/30mm

...but you could explain a bit further....and is this measurement other than standard ones?

You put the rings in the cylinder (without the pistons...), and measure the gap between the ends with a feeler gauge. Standard measures are for the 2 compression rings, 0.30 - 0.45 mm, and for the oil ring 0.20 - 070 mm.

[Killerwhale]

And BTW, if You're contacting JE, ask them what ring gap clearance should be. I didn't bother, just set it to Yamaha Standard, but it might have been wrong...

Hey, just got word. Ring gap should be 1/10 to 1/30mm

...but you could explain a bit further....and is this measurement other than standard ones?

You put the rings in the cylinder (without the pistons...), and measure the gap between the ends with a feeler gauge. Standard measures are for the 2 compression rings, 0.30 - 0.45 mm, and for the oil ring 0.20 - 070 mm.

But this must be to check rings if you buy them on the side so to speak...because after you bored for the pistons it´s kinda done deal isn´t it!?

[HansJ]

Nope, You measure, and if the gap is too little, You have to adjust the rings, i.e. take off some material. I had to adjust mine... If the gap is too big on the other hand, then You're right...

[Killerwhale]

And BTW, if You're contacting JE, ask them what ring gap clearance should be. I didn't bother, just set it to Yamaha Standard, but it might have been wrong...

Hey, just got word. Ring gap should be 1/10 to 1/30mm

...but you could explain a bit further....and is this measurement other than standard ones?

, and for the oil ring 0.20 - 070 mm.

Do you remember the oil ring measurement for JE??

[HansJ]

No, sorry, but I'd set it the same as the compression rings, or slightly bigger. It's not as critical as the compression rings.

[Killerwhale]

No, sorry, but I'd set it the same as the compression rings, or slightly bigger. It's not as critical as the compression rings.

JE answer directly from USA:

Hi Mattias,
Now we're talking! You'll want to set piston to cylinder wall clearance at .0030 or .08mm and your top ring gap should be about .015-.016 or .406mm. Good luck!

[phuk72]

Just checked the box I got my pistons in and the recommended gaps (as provided by TTS) are
0.012 - 0.014 inch for rings