TRI Z cylinder

[sgoaty]

Hi ive got an 86 tri z and the piston is goosed its deformed on the exhaust side, It looks to have left deposits on the cylinder. Is the tri z cylinder coated with nikasil or something similar or will i just be able to hone it. Also how do i know if the last piston fitted was oversize? it has 25 stamped on it.
Thanks in advance
Scott

[whiteman350x]

The z cylinder is not plated. The 25 prolly means .25mm oversize.

[sgoaty]

would this be the first oversize ? and how would i be able to check what piston id be able to fit to it next time ?

[whiteman350x]

You can go to wiseco's site or denniskirk.com At dk just shop for tri-z pistions and they should show all the sizes. On the z I think the next size will be .50 mm.

Whiteman

[mbg75]

.25mm is .10" over, .50mm is .020" over..... etc

[sgoaty]

So if th piston which was fitted was the first oversize and the bore doesnt look to clever. Am i best to go to the next over size ? do i just hone the bore till the rings fit? any help appreciated
thanks

[whiteman350x]

Have a shop measue your cyl. Then you will know if it needs to be bored. Usually they do need to be bored.

[mike from long island]

i personally have the clyinder bored. this way i only have to do it once. but thats just me. i never did a hone before so i dont know if its better. my yamaha warrior was low on compression and the machine shop said they could hone it. i had them bore it. this way i know everything is good. but do what you think is best

[sgoaty]

Thanks guys but i theyre arent any shops that i know of near me. I was kind of looking to do it myself. Is it possible to hone up to the next size ?

[86waterpumper]

The only purpose in honing is when installing rings. This is to deglaze the clyinder where the rings will wear in right, otherwise they will not seal properly. Honing was never intended to be used as a way to go up to the next size bore. Honing that much you would never keep the bore straight or uniform.

[Tri-Z Pilot]

Yeah, honing just freshens up the cylinder, you can buy a honing attachment for a drill, but I would leave the cylinder boring to the professionals.

[JW125M]

:o take it too a machine shop

[86waterpumper]

The best hones are the ball type hones. They work far better and do a more consistent job than the ones with the three fingers on springs like they sell at autojunk, etc. Btw, JW125M that's not very good advice to be giving people. You and your dad may have pulled off a honing to the next bore, if you had some sort of jig, such as a machine shop would, but for what it costs to have a cylinder bored, it is pretty stupid to buy a new piston, and then ruin it and another bore, because you cheaped out. A hone is not meant to make bores with, and there is no way that someone with a hand drill can go all the way up a piston size, without ovaling or egging out the bore.

[TRI-Zbrian]

yeah i know it cost what like 25 $(atleast up here) to get a shop to bore a cylinder out for you lol cheap people amaze me some times doing trailprotrailprotrailprotrailpro half assed all the time and then wonder why there bike runs like trailprotrailprotrailprotrailpro or blows up.

[JW125M]

:?:

[J.D.]

yeah i know it cost what like 25 $(atleast up here) to get a shop to bore a cylinder out for you lol cheap people amaze me some times doing trailprotrailprotrailprotrailpro half assed all the time and then wonder why there bike runs like trailprotrailprotrailprotrailpro or blows up.

What? It's gonna cost me 80 bucks to have mine bored. What a crock.

[TRI-Zbrian]

you are getting ripped off a tri z cylinder is the best cause u dont have to replate it try a different place try a car machine shop thats ware i get mine doen and i get it done alot cheaper cause to them they are used to boring like 8 cylinders not just one small one thats why i get such a good deal

[slippy4]

whats a good deal to you? my small engine shop around here is going to charge me $30....

[TRI-Zbrian]

30$ is fine i get it done for 25$ thow here lol so take that lol and they do a good job when they are doen they cote the thing in oil and put it in a clear plastic bag for you and every thing. over here i can get a cylinder reslieved for 100$ for all the labor and what ever the slieve cost.

[86waterpumper]

LOL I think both the prices you dude mentioned are not really the norm, the price i think usually lies somewhere in the middle. 25 bucks is a steal on getting it done, I wish someone around here did it that cheap (if it's a good quality bore job) A couple places close to here used to do them for around 30 or 35, and here in Jackson, one place got 65, which was high since they bored my buddie's clyinder out before he had brought them the piston. This is one thing to make sure of, even with the same type pistons, the tolerances could be off just a hair, good shops will bore the jug to the exact piston, with the clearances specified by the piston maker. Oh and goku you got taken to the cleaners on that bore job in a bad bad way 80 bucks LOL...but the thing is, even at 80 bucks, it is well worth it if the option is to have it be half assed, and then have to buy another 100 dollar piston and another bore job on top of that.

[Tri-Z Pilot]

It costs me between 40 and 50 bucks at my local shops, and it is a really bad idea to bore a cylinder without measuring the piston first, as waterpumper said, and if that piston is off by a hair, it will either seize up as it expands, or you will loose compression and performance.

[J.D.]

LOL I think both the prices you dude mentioned are not really the norm, the price i think usually lies somewhere in the middle. 25 bucks is a steal on getting it done, I wish someone around here did it that cheap (if it's a good quality bore job) A couple places close to here used to do them for around 30 or 35, and here in Jackson, one place got 65, which was high since they bored my buddie's clyinder out before he had brought them the piston. This is one thing to make sure of, even with the same type pistons, the tolerances could be off just a hair, good shops will bore the jug to the exact piston, with the clearances specified by the piston maker. Oh and goku you got taken to the cleaners on that bore job in a bad bad way 80 bucks LOL...but the thing is, even at 80 bucks, it is well worth it if the option is to have it be half assed, and then have to buy another 100 dollar piston and another bore job on top of that.

I didn't have it done yet, but that's what the Yammy dealer charges, and they send it out to a machine shop in Vegas. I need to call the people who they send it to(found out who they send it to, hahaha) and ask a bunch of questions about there methods and their price, etc.

[Tri-Z Pilot]

Hey Goku, I bet that the the actual shop is only gonna charge you like 60 bucks max. You subscribe to dirtwheels right? Look in there, a lot of places advertise their price for cylinder boring, and it shouldnt cost that much to ship your cylinder.

[Jeb]

$25.00 is too much. I got you all beat... I can get mine done for free!!!!!!!! muhahahahha! :-P :-D

I spit coffee all over my monitor when i read that someones boring to the next size with a hone & hand drill! :shock: :D Now that was funny. Either someone is extremely patient and careful, or extremely lucky. :D Because that's impossible!

[TimSr]

The best hones are the ball type hones. They work far better and do a more consistent job than the ones with the three fingers on springs like they sell at autojunk, etc.

I just got one of the ball types, and they are awesome. The other type cant do the whole cylinder, and your are constantly getting the pedals caught in ports, etc.

Any machine shop can do boring, but I suggest looking for somebody who knows 2 stroke mc/ATVs and is knowledgeable about the different piston types. Yes, it wil probably cost more than $25, but with all the money you spend on these things, a quality bore job is not the place to skimp. I recommend a shop that sends to Wiseco, and if you cant find one, you can ship direct (which will not save you any money). Ive always gone through my dealer, and get it back with a good bore FOR a Wiseco piston. They also round the port lips into the cylinder which many machine shops neglect, and I get it back with a new piston and ring kit. If you dont have a local dealer, Im sure you can find a phone number at Wiseco.com.

[TRI-Zbrian]

yeah i alwase bring the new piston in with the cylinder so they can get the specs off the box for that piston i am using.

[Tri-Z Pilot]

Never trust the specs on the piston box, the piston must be measured with a micrometer to ensure that it will be a pefect fit. Not all pistons for a machine are spot on, it could be off by just a hair, you never know, you need to make sure the piston to cylinder clearance is just right. Oh, hey Jeb, I got you beat, I get all my powder coating done for free muhahaha!

[Jeb]

... Oh, hey Jeb, I got you beat, I get all my powder coating done for free muhahaha!


Nope, I can get that done free too. :-D

Actually, You probably do have me beat though because I can only get a few basic colors done free. And to tell you the truth I've lost touch with the guy that was doing that for me. :(

[Tri-Z Pilot]

Is there anything that you dont get for free jeb? LOL!

[Jeb]

Is there anything that you dont get for free jeb? LOL!


:D :D Free is not always good. Sometimes you'll end up getting what you payed for! :shock:

[sgoaty]

So the moral of the story is Ill have to stop being a cheap ass and get it bored for me :-D

[JMiller]

Py the money and have it done RIGHT 8)