Max RPM ?

[snowbalz]

Just curious what everybody is getting for a max RPM on a drx50? I can't seem to get over 11300 and I feel that is not enough.

[bulldogfallon]

OEM or modified?


The stock pipe doesn't make power that high....We keep them under 10,000 rpm with the stock pipe.


What are you using in your CVT (rollers, torque spring) and your current sprocketing.

[snowbalz]

Rollers are 3.5 and 4 split And the torque spring is a white malassi. I don't know what the clutch shoe springs are they are stock.

[bulldogfallon]

What is your sprocket set up

This is a stk limited 50?

[snowbalz]

Sprocket setup 19/32.

This is a 50 with a ported cylinder 21mm carb, with U4.2 fuel and UNI air filter.

[bulldogfallon]

The pipe is what's limiting you but 11300 is a lot for a stk limited 50 IMO

[snowbalz]

OK well, I guess I will leave well enough alone.

[snowbalz]

Any advantage to the high speed gears?

[jerkyboy]

snowbalz your up north did you run the last race at Walden last year. And on a 50 high speed gears are not going to help you IMO.

[snowbalz]

If you are talking about the tri-state race. Yes we did race it but we did not do to well on the last race. My son got sick on the last day of the race so he barely finished. We ended up with eighth place over all. How did you do?

[quadrider79]

11300 max rpm's on a 50. There is only one word that can describe that, WOW!!! Is the bike water or air cooled?

How does the malossi white compare to the yellow and red? Is it stiffer or softer?

[jerkyboy]

quadrider I think the white is softer.

Snowbalz you were parked behind us. My son is Dale #6
He fininished 2nd overall in the 50 class. He was a little down
on power but still managed to have a good finish. Some of the other riders were realy pulling on him on the long straight away
before the finish line.

[bulldogfallon]

On the 50 with a stock pipe the power should be made under 10,000 rpm.

We have on of the faster 50s in the florida area that also fairs well at national events and the power is made under 10,000 rpm.

The pipe doesn't continue to make power abpove that.

The roller weight with the torque spring set up doesn't seem to favor the ability to turn higher rpms with that sprocket set up.

We use lighter weights and heavier torque springs..

Wish I could see this one in person...

This rpm reading is with the wheels on the ground..not on a stand? Or jumping?

[hotquads1]

white spring and 3.75 avg on rollers ... hmmm, you are shifting the cvt at approx 8100 rpm , if your bike is turning 11,300 top rpm you should be shifting much higher up in the rpm range, maybe mid 10k range, this would take a red Mallossi or stiffer with about 2.6 rollers. I would have to say this rpm you mentioned was free wheeling or the tach is off , or the pipe is not stock DRR , or your cvt is not shifting out of low gear position because you would be running about 40 MPH which would certaimly be fast enough to out run other stock limited 50's. But if all of these things are confirmed correct then throw a stiffer t-spring and lighted up those rollers some and she will really rip.
marc

[quadrider79]

Originally posted by bulldogfallon
On the 50 with a stock pipe the power should be made under 10,000 rpm.

We have on of the faster 50s in the florida area that also fairs well at national events and the power is made under 10,000 rpm.

The pipe doesn't continue to make power abpove that.

The roller weight with the torque spring set up doesn't seem to favor the ability to turn higher rpms with that sprocket set up.

We use lighter weights and heavier torque springs..

Wish I could see this one in person...

This rpm reading is with the wheels on the ground..not on a stand? Or jumping?


Bulldog, I was gonna ask the same question. I did alot, alot of testing last year with the 50's. The max rpm that I came up with was 9360. Now with the tires off the ground it went over 12,000.

[bulldogfallon]

Originally posted by quadrider79
Bulldog, I was gonna ask the same question. I did alot, alot of testing last year with the 50's. The max rpm that I came up with was 9360. Now with the tires off the ground it went over 12,000.

You should be able to pull more rpms than that...

Did you try lighter roller weights? or work with the main jet at all?

Or it could be linked to the sprocket ratio?

Can you provide any details on the above questions?

Carb type too

Lets see if we can squeze a few more roms out of that 50. :)

[ugliest6868]

i tried to post the other day here and screwed it up. just wanted to say that if your doin local racin or stuff where you CAN change the pipe then i would suggest the technigas pipe. it has been tested at SMS and is by far the best 50 pipe you can buy. we were gettin 14,000 rpm's out of it no problem however that was with a SMS top end