Hi everyone!
want to ask what i can do to go a little faster.
did wire splice and mod airbox and now what?
i will do a top end rebuilt and was thinking to put wisecos.
will they be more reliable than the stock pistons?
will they give something?
other thought is to put rear head front.
to do this i need only to have a hose to fit or i need other things too?other plugs?
i have the rear head thats why i am asking.
the gains for the head conversion?
thanks!

Best thing to do is look in the tunning section here on the site, or look at www.tyga-performance.com and look up the power up for nsr's your head will need a hose and maybe a plug! have you done chambers, cans, jetkits, reeds stuffers, etc? really have a look at tyga or tunning section for lots of ideas, i cant commet on the wiseco stuff as mine are standard but @ 60hp thats fine for me!!!

i dont want to spend money for now(pipes,reeds, etc).neither tune it and play with reliability!i red that with the head conversion i will need a hose to fit (i think i can fix one!) and some stubs?

It's not simply a case of slapping a set of Wiseco's in, as the deck height of the piston is different to stock.

As for reliability, well who can say? It all depends on far too many other factors. Longevity on the other hand, will be much less with single-ring Wiseco's. Just ask StephenRC45 ow many sets of rings and pistons he's gone through this summer on his MC21F3!

Unless you are willing to spend a lot of money, and a lot of time maintaining the motor (and I mean A LOT of time!), then stick to the Honda parts and the proven tweaks!

On the other hand, if you want to send us a motor and £1000 then you too can have a 70hp+ screamer!!
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Andy.
NSR-WORLD.COM

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Too true, Ive gone though 8 head gaskets and 4 sets of rings this summer. Add to that all the base gaskets and pistons and your rattling up some moneys worth.

As Andy says, there is no point at all in slapping in a set of pistons in and not putting in the time to set the squish etc. 2 stokes might be pretty simple but they arent thaaat simple, you might lose more by putting "racing" pistons in than you would have done just by sorting out your stock motor.

I know Andy thinks I rebuild/check mine a little too often but when you're making real power and you have invested a lot of money and time into something best keep and eye on it.

I'm getting around 200 miles out of a set of rings, and around double that for the pistons. So, thats pretty much a rebuild every weekend. It is worth it though as the thing does go like hell.
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If I have to take the carbs off once more...

Hey are you replacing the piston and rings because they measure below tolerences or just to be safe?

cheers
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If all else fails - gas it!

Also with Wiseco pistons, they are forged and they have a tendency shrink after the first heat cycle almost .0015.
I tried them in my TZ 350`s for a while and the trick was to put them in the oven @ 400 degrees for 20 minutes before fitting them. You also have to give ample warmup time before you give em the berries as cold siezures are common with them.
They were also heavier than the stock pistons.

Not recommended!

Mike
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Mike

Thats strange as Wobbly (Top 2 stroke tuner)runs these pistons in his go-karts reving to 15000 rpm + with good life and excellent results.

They need a good warm up or they will seize, but then they are top stuff.

You are talking about the Pro-lite single ring ones?

Cheers
Jared
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If all else fails - gas it!

Sure. I have heard all kinds of stories about guys running these with no problems. Then, if you stick around them long enough, you find out the truth!

Wiseco's just plain suck. Their pistons shrink and swell so much, it almost takes an act of God to get them to work.

I found this out lately, as one of the local machinists here does a whole lot of overbore work. In his statements, almost ANY of the other top brand piston makers are a much better choice, even if you have to get the pistons custom made.

My previous NSR was running Wiseco's as an overbore kit. The pistons were WAY lighter, and the bike ran like a raped ape. BUT... I never could run down a straight for more than 20 seconds WOT without it four-point seizing. And the last time happened after 100 miles of break-in and 3 hours of warm-up.

I warned one of my coworkers about this. Last weekend his wife seized his Wiseco-pistoned Banshee out in the 'dunes...
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Paul Herr
'88 FZR4/GSXR/YZF Frankenbike
MY BIKE PICS

Well I here a lot of stories as well - thats the internet for you, full of experts!

When a tuner who builds world championship winning go-karts, classic race bikes, has developed a gp500 bikes for WCM, kr3, and has built a v3 gp500 bike (producing 147 rwhp), from scratch, and he builds 3 or 4 race engines a month with no problem then I suspect it has more to do with the set-up than the piston.

Wiseco used to be the worst piston maker everybody here knows that, however about ten years ago they head-hunted an expert from a different company and he has completely changed there manufaturing process and quality control.

I have heard from several sources from within the gp paddock that there pro-lites are as good as anything hrc or others are producing.

Who knows, maybe i will eat my words as i'm running these pistons in my nsr project, well see.

Wobbly has just set-up one of my brothers kr1s's with these pistons as well so i'll know how they go soon. I will report back.

cheers
Jared
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If all else fails - gas it!

I used to run my TZR125 Ministocker on Wiseco slugs. They needed huge clearance and required very careful warming and running in. You'd have to heat cycle them and then pull 'em out and rub down the high spots. Then run them up and down the road for a while, then pull it apart again and rub down any more high spots. Then you go racing. It was hard work, but they were reliable once you got them to the right shape!

An NSR that was here (no names mentioned) was running (RM125 I think) Wiseco pistons. It had a bit of an issue on first start up which was a crank seal. We replaced that, but I mentioned that the bore looked a little tight. Sure enough, half a lap of the pit and it nipped. Not a piston problem, just not enough clearance.

My CR250 had a buggered (std) piston when I first bought it. I replaced with a Pro-X, which cracked after about 100kms. Swapped this for a Wiseco and never had a problem again.

My CR500 ran all last year on the same Wiseco piston. I pulled it apart many times, but I only changed the rings once during the Supermoto season. It was a bit wobbly come the end of the year, but still worked fine.

Fitted Wiseco to various other crossers 125/250 with no reported problems.

I also had special one offs made that have won the 160cc 2 stroke drag race championship in Thailand two years running, and are leading the championship now. Fastest time and highest terminal. We tried various other types/makes and they've all flown apart.

Wiseco boiler pistons seem to be ok too. Heard scarey reports of hi-comp CRF450 pistons going pop, but not had one break that I've fitted.

We're also looking to make some specials boiler slugs for the 160cc 4 stroke drag racer here and it's Wiseco I'm in touch with. I'm very happy with their service and technical help.

I've never really given any other piston make a good enough chance to say which is the best, but I'm happy with the way that Wiseco have worked for me and with me. Let's just hope the pistons they made for my 300 stay together, or they'll be getting a phone call

I suspect it has more to do with the set-up than the piston.

Exactly. And they take a whole lot of careful setup to work, which is my point. I just want the guy who is asking about these pistons to know what he is getting into.

Be prepared to do this:

They needed huge clearance and required very careful warming and running in. You'd have to heat cycle them and then pull 'em out and rub down the high spots. Then run them up and down the road for a while, then pull it apart again and rub down any more high spots. Then you go racing.

Then, loose horsepower because you large clearance required makes your ring gap larger.

The guy I got my info from did some extensive testing on the Wiseco's. Heat cycling them and checking them with a micrometer to see how much they changed. The Wiseco's consistanty changed way more than any other piston he has tried. He runs a machine shop here locally and does TONS of standard bore and overbore kits, and alot of testing for a local Jetski pro.

I WISH the Wiseco's were better. I dumped a whole lot of money into my bigbore kit and wished she had turned out rock-solid reliable. In the end, I wished I would have just got the Tyga 300 kit.

Just be prepared: every Wiseco that I have seen seized in an NSR cylinder has also cracked the exhaust port and ruined the cylinder. It'll cost you alot more than just a new piston kit and replate.
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Paul Herr
'88 FZR4/GSXR/YZF Frankenbike
MY BIKE PICS

i had some prox pistons in my 21 and never had any probs with them it mite be worth giving them a try

Thanks for the info guys!
its better work with the stock pistons!
now working and saving money for a 300kit...
i just want to ask what it would be if we had the 300kit rebored to 350 and the other tyga mods.matt do you hear?

Wrench. wrote:
In the end, I wished I would have just got the Tyga 300 kit...

TYGA's 300 kit doesn't use Honda pistons either.
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Andy.
NSR-WORLD.COM

Please keep all responses to Forum posts on the Forum so that others may benefit.

Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.

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