Max RPM

[dave92029]

Early this AM I got on the freeway to meet some friends for breakfast.

The traffic on I-15 moves at a brisk pace, so I was trying to keep the engine RPM's around 8,000.

I got to thinking about several discussions on Chinariders Forum about the speedometer / odometer error and how to correct the error. I believe that many of the forum members who have corrected the errors have needed to reduce the indicated numbers by approx. 10%.

What I was wondering, if the odometer/ speedometer originally overstate the true speed and mileage by an indicated 10% , then is the RPM that is indicated on the same gauge also overstating the actual engine speed?

Would this mean that if the bikes are going down hill, is it safe and within the manufacturers specifications to let the RPM's run up to 9900 RPM ( 10%) above the indicated levels?

I try not to run the bike above 8000rpm, which is approx. 10% below redline as indicated on the gauge, but if that gauge is not accurate, and 10% overstating actual preformacne, am I actuating keeping the RPM's at approx 20% below the actual true engine speed

[Eco Mouse]

You could always get a optical tachometer and bench test the engine's actual RPMs.

[katflap]

I seem to remember when i have had my RX3 hooked up to the PCHUD diagnostic software, the tacho was near enough spot on

[SpudRider]

I think the Chinese are being overly cautious if they say the engine has a redline of 9,000 rpms. The Yamaha TW200 engine has a redline of approximately 10,000 rpms.

[jbfla]

Originally Posted by SpudRider

I think the Chinese are being overly cautious if they say the engine has a redline of 9,000 rpms. The Yamaha TW200 engine has a redline of approximately 10,000 rpms.

I remember reading (but can't remember where) that the rev limiter of the RX3 is set at 11,000 rpm.

jb

[SpudRider]

Originally Posted by jbfla

I remember reading (but can't remember where) that the rev limiter of the RX3 is set at 11,000 rpm.

jb

That figure sounds a lot more reasonable. I frequently push the engine above 9,000 rpms, and I haven't had any problems, whatsoever.

[rtking]

Originally Posted by SpudRider

That figure sounds a lot more reasonable. I frequently push the engine above 9,000 rpms, and I haven't had any problems, whatsoever.

I think the cut-off is around 10,500 rpm, as my dyno runs stopped there. But good to hear that others are running past redline. I do it frequently as well since the NC250 engine just likes to pull and power delivery is so linear.

[jbfla]

Originally Posted by rtking

I think the cut-off is around 10,500 rpm, as my dyno runs stopped there. But good to hear that others are running past redline. I do it frequently as well since the NC250 engine just likes to pull and power delivery is so linear.

rt, the dyno would be pretty good evidence for me.

From the CycleWorld review of the RX3, " the rev limiter cuts in around 10,500."

From Joe Berk's blog of Dec 24th, 2014:

"Another tidbit…the Cyclone has a rev limiter that kicks in at 11,000 rpm. The tach redline is 9,000 rpm. I didn’t know that until I talked to the bike’s designers on this trip"

jb

[SpudRider]

As the fuel gauge, I think the Zongshen engineers are being overly conservative by marking the redline on the tachometer at 9,000 rpms.