What difference are from the moriwaki pistons?

Where can i buy a cuople of high compression pistons?

thanks!

 

Moriwaki will be more expensive, but they may also be lighter.

 

http://www.orientexpress.com/Honda/S...+1000/Pistons/

 

I forgot to mention, I have American made CP forged pistons in my bike.

 

What include the JE Piston kit?

The new rings are present in the kit?

What should I buy over the kit?
Only the head gaskets or other?

Please answer quickly, i've make an order ad thinking about this kit...... thanks!!!

 

JE pistons use the stock Honda rings. You will have to buy those too.

 

Nothing else? And the head gaskets?
Are you sure?

 

Well, splitting the head's usually means replacing the gaskets... It's kind of implied...
And to get there you usually remove other stuff first that might need new gaskets and/or Hondabond (or similar)...

 

I think you can buy 2 gasket kits and if I recall you'll need both. I think there are ways to get the pistons out without complete disassembly, but that to me seems sloppy and depending on the motor age/condition you might as well do it right. Just my opinion. You'll need new con rod bolts also as a minimum. The little parts add up quickly.

 

JE's are only offered in standard bore unless you want to buy a custom set. Also their customer service is crappy. I got really screwed by them once and I will never buy another piston from them again. I'll go with either Weisco or Arias next time. I'd rather pay them money for a custom than deal with JE again.

Are the Moriwaki pistons even still available?

 

Not sure Jamie, it has been a long time since I asked about them.

 

I'm 99.99% sure they still only offer the standard bore. They are a bunch of turkeys over there at JE.

 

Looks like they are. Scroll all the way down, 4th from the bottom here. http://www.moriwaki.co.jp/global/product/op.php

 

These fit in without boring, correct? And how much power do these give due to the added compression?

 

I got good service from JE and the vendor I bought them from. Obviously YMMV, but I had a good experience.

 

JE pistons have a slightly higher dome volume and give a slightly higher compression ratio than Moriwakis. I'm pretty sure that Moriwaki pistons are the same as HRC. Mori bought HRC pistons and valves and put them in Mori plastic bags.

JE pistons work fine, but tend to be a bit loose in stock bores - a combination of JE machining to the low end of the skirt tolerance and Honda machining to the high end of the bore tolerance.

If you are going to all of the trouble, it only makes sense to replace rings, main and rod bearings, con rod bolts (a must) and seals. I would recommend cutting new valve seats too. You might also consider shimming the end play of the gears on the transmission shafts.

I posted a list of part numbers a while back. It's on here somewhere.

 

+1 and Rama I wouldn't order anything till you measure your cylinder bores cuz you may need to bore/hone them to the point that you'll need oversized pistons and rings...I'm going with OS JE Pistions in my motor, but beware if you order custom/oversized pistons you'll have to order a set of 4 and sell the 2 extras you don't need.

 

I think that Wiseco and JE sleeps together, at least owned by the same group.
On the BMW crowd CP pistons are preferred with Carillo rods, not the cheapest, but you pay for what you have.
+1 on con rods bolts.
The rods bolts are easy on one side, but the other may require some trickery, specially to get accurate torque readings, like an offset arm, or maybe a simple U joint will do, but not the best for accurate torque.

 

Wow, the Superhawk/Firestorm must pull like a beast on steroids. JE says their piston is 11.5:1, and Greg's site says stock is 9.4:1. WOW!

 

I'm thinking about retro-fitting my machine with h.c. pistons. Mines a '98 model that I purchased new in '99.

These should be first over-size as my bike has now gone 54,000 miles and the cylinders would likely need to be bored to first over-size. These would complement the stage 1 Yoshimura cams and Yoshimura full system exhaust. But I'm not sure if these are available in first over-size.

Need to do some research on this.

 

I was looking into this when I rebuilt mine and could not find any company that offered an oversized HC piston. If you do, please share!

 

Why the heck JE would offer standard bore pistons in their catalog but no oversizes for service use is beyond me. What happens you need to replace the pistons later on? You are hosed.

JE will happily make you an oversize, but you have to buy four. Pretty much everyone is the same, that's why I'd go with Arias or Weisco instead - you'll get treated better with those guys.

 

You got that right,
If someone raise it's compression, obviously it's to increase performance, why not machining the cylinders to get as little leakdown as possible, the oversize should be the first choice.

 

I wouldn't retro-fit my bike with standard size HC pistons, not with 54,000 miles on the odometer.

According to the Honda service manual, pistons are offered in 2 over-sizes - 0.010" and 0.020" - so it would be nice if after-market pistons were available in these sizes also.

Looks like Wiseco would make over-size pistons, but on a custom order basis only. Arias is probably the same.

JE would provide these, but I would have to buy 4. What to do with the other 2 pistons??

Waiting on Moriwaki to respond.

I thought there was an outfit or 2 (Vee Two or HPower) in Australia that makes HC pistons for the VTR.

The quest continues....

 

I ordered 4 OS JE Pistons and sold the 2 I didn't use on this forum. You wont have any trouble selling them if you buy a custom set of 4...just make sure you order them to fit the OEM over sized rings which come in 0.25mm OS or 0.50mm OS:

http://fiche.ronayers.com/Index.cfm/...NKSHAFT_PISTON

 

HPower in Australia (www.hpower.com.au) advises over-size HC pistons are not available from Moriwaki for the VTR, standard size only.

I'm SOL then, it's gonna have to be a custom order if I go ahead with the retro-fit.

 

I have custom made CP pistons. You only have to buy two from them.

 

Where you buy CP Piston? and they are H.C. pistons?!?!

I can't look in CP's catalogue a model for VTR...

 

UP for shayne...