whats the peak rpm on some of the 2 strokes.

[TRI Z Racer]

i was just wondering this earlier today, does anyone actially know what their peak rpm is? Do you guys think its 10k or more? I am guessing its close to 10,000prms, I have a Tri Z and id love to know what my peak rpm is. anyone out there with a tach?

[Blown 331]

I don't have the answer but interesting topic. Do they have any type of rev limit built into the ignition? There are lots of bikes that the revs are controlled by the CDI. That would tell you the RPM limit right there. I'm not sure a TRI-Z has that though. One the ones that do lots of times you can buy an aftermarket CDI that increases rev limit and advances the ignition curve.

[TRI Z Racer]

yeah, i dont think 2 strokes have rev limiters, i think thats more on the newer quads.

[86250RZ]

No rev limiter. Im almost positive that the 85/86R rev's to about 9,000 RPM. Not sure about the Tri-Z

[BIGCRIP28]

No rev limiter. Im almost positive that the 85/86R rev's to about 9,000 RPM. Not sure about the Tri-Z

probably at least, the 350x tach has 8250 as a redline.
i dont think any of the trikes have rev limiters, at least any of the ones i have ridden.

[slothminx]

i havent had exsperience with the z's or the r's, but our small yamaha 2 stroke bike 80cc revs to 15,000rpm without pushing it too hard, and my goped revs to 17,500 rpm, so i think these would be around 10-12,000rpm correct me if im wrong

will

[OldSchoolin86]

Both the Tri-Z and 250r(liquid) can turn anywhere from 9,500-11,000 depending on what was done to them. Most completely fall off of power by 10,000.

[hrc85250r]

some of the newer 2 strokes have a rev limiter, also the yamahas had the t.o.r.s. system on the shee's and blasters....

[TRI Z Racer]

the reason i asked this was cause i have a "tiny tach" i picked up for 5 bucks. its a small digital tach and hour meter, it only goes to 9995 rpms though. im gonna give it a try, see how i like it, its only one wire and no permanent modifications. well see!

[03 ORANGE SHEE]

the tors is throttle override system, which shuts the motor down if the throttle remains stuck open, like a tps, and your expansion chamber determines your peak rpm.. i bet my zilla red lines at 6,000 rpm

[Troll 2]

Here's a dyno chart for a 86' 250r http://www.macdizzy.com/trx_dyno.htm Looks like the peak is at 8 to 9k................................ :beer

[OldSchoolin86]

Here's a dyno chart for a 86' 250r http://www.macdizzy.com/trx_dyno.htm Looks like the peak is at 8 to 9k................................ :beer
That chart shows peak RPM to be between 9-10. Peak HP on that was between 8-9.

[SpeedBump]

The Tiger 200/250 that I had, 13000+ and would keep going until it exploded. That was the story from the original owner who had raced, blown it up, rebuilt and blown it up more than a few times. As for the other normal 2 strokes...like most others said....9-11 range. Porting, Pipe and also carb size all make the difference.

[42F67N]

my 2 stroke blaster will rev to 8500 stock

[CHAINSAW]

Yamaha's (YZ motors) will rev higher then Hondas. My dyno guy says a typical Tri Z or YZ motor will peak at 11,000-12,500 and a honda will peak at 9,000-9,500. He used to race mini sprints and used yamaha's only because he could rap them so much tighter and they would hold together longer even with the high rpms.

[TRI Z Racer]

good bit of info to hold onto

[OldSchoolin86]

Yamaha's (YZ motors) will rev higher then Hondas. My dyno guy says a typical Tri Z or YZ motor will peak at 11,000-12,500 and a honda will peak at 9,000-9,500.
Your dyno guy's wrong. The new YZ's won't even turn 11,000 without some heavy work.

[CHAINSAW]

sorry to break it to you, but my YZ motor in my Z was pulling right at 11,000 and my pipe was holding me back from going any further. Ive seen it with my own eyes, on a motor thats only had a little bit of work done to it, so dont be calling me out unless ya got some facts man.

[OldSchoolin86]

sorry to break it to you, but my YZ motor in my Z was pulling right at 11,000 and my pipe was holding me back from going any further. Ive seen it with my own eyes, on a motor thats only had a little bit of work done to it, so dont be calling me out unless ya got some facts man.

First of all, if your hitting 11,000 you better shift because you've rolled right past your powerband. Second, please don't confuse me for some punk kid that just speaks the word of magazines. Third, your calling me out for facts when you haven't ponied up a single one yourself. Now since we've taken this to a debate level the true way to resolve this would be working together in a dyno room getting our own results. The problem is that we live way too far apart and I'm not sure that we should even be putting this much effort into this. With that said I'm going to offer the classic facts of other people's dynos. ;)

http://www.boyesen.com/ezimagecatalogue/catalogue/variations/67-550x550.jpg

http://www.fmfracing.com/dynocharts/yamaha/yz250sst.jpg

http://www.geocities.com/gtthunder.geo/yz250.jpg

[jmack3986]

well i dont have facts but i have knowledge and most of your atv motors 4 stroke include exempt are the new racing four strokes. hondas and yamahas will rev about 10.5 to 11 and my 200x rev limiter is 9.8. now on newer bikes like my cr it is reving close to 12 the new racing four stroke crf and yzf will rev 13.5 chansaw is right with the right mods you can broden your power curve now another thing that will affect your rev limit is jetting lean will run mean untill it burns up. a lean engine will rev higher becuase of the fact you are getting more air. like i said earlier with the right mods like maching the piston or turboing the crank or even port and ploish if you port and polish make sure not to polish intake side or it will run like ****. a new reed cage or reeds could give you a higher rev. stock though will rev out at eleven all your racing 2 strokes will hit 11 or close to it give or take a few.

[OldSchoolin86]

well i dont have facts but i have knowledge and most of your atv motors 4 stroke include exempt are the new racing four strokes. hondas and yamahas will rev about 10.5 to 11 and my 200x rev limiter is 9.8. now on newer bikes like my cr it is reving close to 12 the new racing four stroke crf and yzf will rev 13.5 chansaw is right with the right mods you can broden your power curve now another thing that will affect your rev limit is jetting lean will run mean untill it burns up. a lean engine will rev higher becuase of the fact you are getting more air. like i said earlier with the right mods like maching the piston or turboing the crank or even port and ploish if you port and polish make sure not to polish intake side or it will run like ****. a new reed cage or reeds could give you a higher rev. stock though will rev out at eleven all your racing 2 strokes will hit 11 or close to it give or take a few.
If we're talking good to heavy mods then sure, just about any of these numbers are possible. I was just under the assumption that this thread was started to get a general idea of general old 2-strokes. The opening post is asking about a Tri-Z motor.

[TRI Z Racer]

i started the post cause i was curious about all older 2 strokes, i just more specifically wanted to know what the tri-z or yz peaked at.

Oldschoolin - those numbers my be rear wheel HP numbers right?

[OldSchoolin86]

Oldschoolin - those numbers my be rear wheel HP numbers right?
Yes they are.

[Lots_Of_Nothing]

I dont have any numbers for you, but I can say this.. my 85 triz revved higher then the 84 and 85 250R's I had. But the Z's power was DEAD long before it topped the revs out.

Now the 87 Tecate I had for a week, That thing revved to the MOON, that sucker just kept climbing and climbing, and it never seemed to stop pulling like a bastardI had it revved out down the road, and I figured I'd see how far I could take it, And I blew the crank out through the case. So I guess its better to Just keep them in the rpm's that are usefull.

[CHAINSAW]

First of all, if your hitting 11,000 you better shift because you've rolled right past your powerband.


His question had nothing to do with peak power, it was max rpm. If you have been on any kind of dyno with any 87-91 YZ motors, you will know with a few bolts ons, they will reach 11,000 easy. With some port work, pipe work and playing around you can reach 12,500. So easy on the know-it-all stuff there buddy, you arent gonna try to tell me the sky is green when Im looking at a blue one (not to mention inside the dyno room, not taken off someone else website)

[OldSchoolin86]

His question had nothing to do with peak power, it was max rpm. If you have been on any kind of dyno with any 87-91 YZ motors, you will know with a few bolts ons, they will reach 11,000 easy. With some port work, pipe work and playing around you can reach 12,500. So easy on the know-it-all stuff there buddy, you arent gonna try to tell me the sky is green when Im looking at a blue one (not to mention inside the dyno room, not taken off someone else website)
Re-read the earlier posts and you'll see how pointless your last post was.