I know this topic has been touched on previously but I am wondering if there is a proper method of honing the GPR cylinders that the dealers use or that RIVA follows.

Riva, please comment and educate all of us..

Also my GPR, with stock engine at 100 hours, has some brown on the cylinder liners. Almost as though it was running hot. Does anyone know if this a problem?

They can answer all of your questions

www.uschrome.com

Fercho

I have no scoring or seizure marks just some brown discoloration. Since I've got a 100 hours on this engine I though about just tossing some new rings on and having it honed but would like to have it honed correctly.

If I've got an engine problem, brown discoloration on cylinder walls then I'll have yamaha cover it under warranty if possible.

I was told by Eric Gorr to use some Scotch Brite and clean them. If you need honing to do it properly an expensive and special tool is needed. Mario spoke in detail with Eric, he can tell you all about it.

Fercho

If you need to hone you must use a diamond hone, you can have it done at an upscale exotic auto shop as Porsches and Ferraris an some others now use plated cylinders, or you can send them to Eric or US Chrome, where Eric sends them anyway. you might not need a hone at all, but little cleanups that are not seizures can be done with scrochbrite pads or even a ball hone for more pesky ones, the ball hone just is not adequate when you need to take a little material out the nickasil is just to hard for it. Eric charged me 25 per cylinder to do it to my blueprinted cylinders.

I have used a ball hone in the past ,It will cut the nicell.

If you dont have any scoring Just use a stoch bright pad.

I also use those pads on the pistons & PV's to remove carbon,They work great!

Be sure to check your end gap on your rings,yes even if you use the standerd size.
never trust the people that put stuf in box's

SEA YA

anyone else hone their gpr cylinders??? I know some of you must have re-ringed your GPR by now.

How did you hone your cylinders?

I had Watercross of Texas hone mine out....they are nicasill......Ultra 150 cylinders.....they used a special machine to hone them, and also used muriatic acid to clean them up......they look great.....also worked the exahaust ports a bit, to help from hanging a ring....

i'm going to weigh in on this.. the mx bikes use nical cylinders and anytime i replaced the rings, i ran the bead hone through the cylinders. it left a fresh crosshatch pattern in the bore that allowed the new rings to seat. i never had any problem with this procedure and have done it several times on my gps.
everyone has their own opinion , but i raced mx bikes for 25 years......
this is a simple process, once done, you need to use a HOT soapy solution to flush the residue out of the bore, then spray it down with WD 40 and take a paper towel and wipe down the bore until the towel comes out completely clean. re install and let it rip!

Dont let Watercross of Texas touch your GPR

[ 07-29-2002: Message edited by: Fercho ]

Will new rings seat properly without honing the cylinders? I seem to be getting some ring blow-by on my pistons. Brown residue that builds up to just below the 2nd ring. If I clean up the cylinders with Scotchbrite, will there be good crosshatch? I don't have any scoring in the cylinders. It just seems some charge is getting by the new rings. only about 10 hours on new rebuild. I would like to cure the problem in this rebuild. Please ADVISE.

quote:

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Originally posted by Fercho:
Dont let Watercross of Texas touch your GPR

[ 07-29-2002: Message edited by: Fercho ]

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They wouldn't touch a GPR anyway, They do Kawasaki's........I was just letting the guy know it could be done....and yes, they did a TERRIFIC job on my cylinders..........

I have seen his GPR performance package first hand, which I am sure that you have not otherwise you would be surprise

[ 07-31-2002: Message edited by: Fercho ]

waveracer,
you can scotchbrite the cylinders until you finger bleed, but a bead hone is the only way to break the glaze and give the rings something to seat against.

Elfboy I see that you know the story very well.

The pictures that I took speak loud and clear.

I cant understand why soomeone who builds a race ski does not true and weld a crank and somehow after 10 hours of use the stock reed just come loose, .

If you did not see the actual finished product your opinion is actually worthless. You can not coment on what you have not seen. Your opinion is based on what you think. I saw his job first hand.

MXVET,

scotchbrite and muratic acid will do the job.

fercho,
why do you let this guy get to you? we know that you integrety is beyond question. you knowledge and pictures are testimony to 'been there done that'. there will always someone who thinks this tuner or that company is better (**** , i've had eric gorr do some of my race cylinders over 12 years ago!!!!) , i for one, and the majority of this forum will listen to you above almost everyone else.
keep up the great work and thank you for SHARING !
david

ele, you keep bringing up a post that refers to Fercho's advise being responsible for a seizure, y don't u copy and paste a link for our viewing pleasure since you seem poised to fight. I guess that would clear the air as to wht you are refering to, as I remember no such allegations, and even if they are true, someones advise only cannot hold someone responsible for the executors work and if someone does work as a fix for someone elses bad work, there are always things that can be missed and that person still cannot be held responsible. If you want to screw someone for performing bad work you can only do so if this person is the only one that ever touched the boat and only his actions could have caused a catastrophic reaction. As has been well said, Fercho's reputation preceeds him and you slanderous statements hold no water.

Oh Oh, elbouf, looks like you started on mess. You must know something about this mees. You should not slander some one, although Mr. Fercho almost did that to water of texas. It might get interesting. Whose ski was it?

ball hone is fine to break the glaze [brown stuff] and set a new cross hatch pattern properly. Rings will not seat without doing the cross hatch pattern. The brown on the walls is the result of blowby of burnt gases. they slip past poorly sealing rings. It is not a warranty issue. New rings, deglaze with wd-40 then wash with hot soapy water to get rid of all grit and cuttings. then light oil and reinstall.