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Old 11-26-2011, 01:57 PM   #1
halmc OP
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Two smoke boring

I have a Yamaha IT 175 that needs an oversized piston fitted. Everyone in my neck o' the woods wants to hone the cylinder, but I want it bored.

My question: any folks out there in ADV land have a machine shop that they use to bore small (~67mm) jugs? Although I'm in N. Fla, I don't mind shipping via ups, etc to a machine shop in a distant place.

PS: I've looked for a two stroke section of ADV, but never found one. If this note belongs somewhere else, please PM me and let me put it there.

Thanks!
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Old 11-26-2011, 02:21 PM   #2
SpeedFourJoe
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I'd check with Enduronut on http://yamahaenduro.com/. He really knows the old Yamahas. I think he charges $40 for bore, hone, and chamfer.
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Old 11-26-2011, 02:22 PM   #3
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Try Gary at http://www.spec2.com/

He has been doing 2 strokes forever and knows Yamahas intimately. He also did all the boring for Moto Carrera as well as numerous other shops around So. Cal.
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Old 11-26-2011, 02:37 PM   #4
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Send me a PM. We can do it here.
http://www.titanracinginc.com/
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Old 11-26-2011, 03:08 PM   #5
concours
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Quote:
Originally Posted by halmc View Post
I have a Yamaha IT 175 that needs an oversized piston fitted. Everyone in my neck o' the woods wants to hone the cylinder, but I want it bored.

My question: any folks out there in ADV land have a machine shop that they use to bore small (~67mm) jugs? Although I'm in N. Fla, I don't mind shipping via ups, etc to a machine shop in a distant place.

PS: I've looked for a two stroke section of ADV, but never found one. If this note belongs somewhere else, please PM me and let me put it there.

Thanks!
The oversize piston fitment process involves both, first we bore, then we hone to final size and cross hatch pattern.
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Old 11-26-2011, 03:46 PM   #6
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Originally Posted by concours View Post
The oversize piston fitment process involves both, first we bore, then we hone to final size and cross hatch pattern.
This normally is the correct procedure. However, it does depend upon how much material needs to be removed.
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Old 11-26-2011, 05:01 PM   #7
concours
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This normally is the correct procedure. However, it does depend upon how much material needs to be removed.
All japanese motorcycle pistons are offered in .5mm, 1.0mm, 1.5mm O.S., and so, the minimum bore is .5mm, (he didn't specify the amount needed to clean) way more than is practical to hone out.
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Old 11-26-2011, 09:42 PM   #8
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Originally Posted by concours View Post
All japanese motorcycle pistons are offered in .5mm, 1.0mm, 1.5mm O.S., and so, the minimum bore is .5mm, (he didn't specify the amount needed to clean) way more than is practical to hone out.

You are incorrect here, Sir. Some OEM & aftermarket suppliers offer in increments of 0.25mm....especially in racing-specific engines. I know this to be true of the Suzi PE-175 - the Yamaha IT-175's ISDE arch-rival. It's worth a look-see in Yamaha's FREE online lookup to be sure.

*EDIT* I took a quick look on "Yamaha-Motor.com" and saw that the 1982 model had 4 oversize piston kits available, in +0.25, +0.50, +0.75 & 1.0mm. I had not noticed the OP's model year, but I suspect that the same pattern follows for most years, based on my past professional experience with Yamaha.
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Duck_Pilot screwed with this post 11-26-2011 at 10:40 PM Reason: Fumbly fangerz.
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Old 11-27-2011, 07:05 AM   #9
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Two stroke cylinders are hard on boring tools. The interrupted cut beats the hell outta carbide. That's why I prefer to hone .010"/.025MM. If it needs more than that boring is OK but I'd rather not. Modern stones can take a lot of material out fast. Sometimes with cast in liners boring is needed to square the bore up. Yamaha is particularly bad with that.
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Old 11-27-2011, 01:33 PM   #10
concours
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Quote:
Originally Posted by Duck_Pilot View Post
You are incorrect here, Sir. Some OEM & aftermarket suppliers offer in increments of 0.25mm....especially in racing-specific engines. I know this to be true of the Suzi PE-175 - the Yamaha IT-175's ISDE arch-rival. It's worth a look-see in Yamaha's FREE online lookup to be sure.

*EDIT* I took a quick look on "Yamaha-Motor.com" and saw that the 1982 model had 4 oversize piston kits available, in +0.25, +0.50, +0.75 & 1.0mm. I had not noticed the OP's model year, but I suspect that the same pattern follows for most years, based on my past professional experience with Yamaha.

LOL, I knew it. I thought of writing "most" but got lazy. Carry on. Hone away.
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Old 11-26-2011, 05:37 PM   #11
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Quote:
Originally Posted by halmc View Post
I have a Yamaha IT 175 that needs an oversized piston fitted. Everyone in my neck o' the woods wants to hone the cylinder, but I want it bored.
surely there's a shop in your area that could bore it. the real question is why does everyone want to hone it? is it not bad, and you just wanna bore it for peace of mind? i know on my it200 that is now on last bore, i wish a hone was all it needed - it200 cylinders do not grow on trees... make sure the ports are chamfered too.... have had a few cylinders come in that were not chamfered, don't know why....
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Old 01-29-2012, 07:22 PM   #12
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Originally Posted by stainlesscycle View Post
surely there's a shop in your area that could bore it. the real question is why does everyone want to hone it? is it not bad, and you just wanna bore it for peace of mind? i know on my it200 that is now on last bore, i wish a hone was all it needed - it200 cylinders do not grow on trees... make sure the ports are chamfered too.... have had a few cylinders come in that were not chamfered, don't know why....


There is a company here in the PNW that makes sleaves for all kinds of bikes you might want to contact them nwsleeve they make all kinds
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Old 02-02-2012, 12:44 PM   #13
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US Chrome will bore and replate and get you a piston kit for it-check their website.
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Old 02-09-2012, 03:19 PM   #14
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I have been using eric gore racing for years. Everything and any thing 2 stroke he wrote the book. http://www.eric-gorr.com/
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Old 11-27-2011, 08:23 AM   #15
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If the cyl .isn't worn and clearances are fine don't waste the money on a bore job. Theres very little hp.to be gained by simply boring it out, however it will run hotter with each increase in size causing more rapid wear.
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