I've had my new bike out for one ride so far, and have a little hr meter with RPM guage that tracks max rpm's and it seems to be reading low.. At idle the numbers seem logical, but when revved out it seems low.  So what is approximately our max rpm?  I would have assumed over 10,000.. But maybe with the heavy flywheel and restrictive exhaust it just can't get there?  Anyone?

 

https://goo.gl/photos/ofYmTm8ik3d2TRKP9

Pic from yesterday 

Edited April 10, 20179 yr by jmutiger
Trying to make the pic up and down not sideways

I wouldn't trust the revcounter on one of those meters.  Still, you won't have to worry about it for long - I don't think I have come across one that lasted more than half a dozen trials.

28 minutes ago, jmutiger said:

I've had my new bike out for one ride so far, and have a little hr meter with RPM guage that tracks max rpm's and it seems to be reading low.. At idle the numbers seem logical, but when revved out it seems low.  So what is approximately our max rpm?  I would have assumed over 10,000.. But maybe with the heavy flywheel and restrictive exhaust it just can't get there?  Anyone?

 

I wouldn't anticipate you'd reach maximum revs on a brand new engine.

Neither would I advise trying to as a way of running the engine in.

Why would you ever want to rev a trials bike engine to 10,000 ?

Why not go and buy yourself a motocross bike

Guys, I'm not trying to hit max rpm  I just wanted to know what theoretically the max is.  

If its still on its warranty period, wind'er up and dont worry about it

 The 4Rt has a very short RPM range. Who cares what a meter shows. You want more, there`s plenty in the aftermarket. I followed Frexia a little this weekend at the USA nationals. His bike rev`s way past what a stocker does.

I would expect a stock 4RT engine without limiters should get up to at least 8k, however I wouldn't be shocked if they limited it in the ECU. 

Long shot but... Any chance you got the bike with any of the limiters that can come in the EU road versions by mistake?  Seeing that your in BC Canada and I don't know what options you can get there I figured it doesn't hurt to ask. 

Edited April 10, 20179 yr by jonnyc21

Generally a racing (as in max power / speed) 2t engine has a maximum piston speed of about 4,000 ft per minute. This would equate to a shade over 10,000 RPM on a 300 Sherco. As trials engines are tuned for low end torque and only deliver about 1/2 power of a MX engine I would think a Shercos max revs would be some way short of 10,000 especially as it has a restrictive exhaust and not an expansion chamber.

Edited April 10, 20179 yr by dadof2

I just changed my profile to reflect the fact that I'm no longer on the Sherco factory 

 Probably someone that has played with mapping would know more. The factory usually showed n/a on any literature. We have 4 4rt`s at work and they really don`t rev real high as the stock unit is made to make the most torque at mid rpm.

My seat of the pants guess or maybe soles of the boots guess is that trials bikes max out around 6000 rpm, maybe less. That is why they feel "softer" with lower gearing...if it gets away from you, it runs out of rpms fairly quickly.

They tick over at 1800rm,  so I'm guessing they could pull more than 10k

Maps on the std bike goes to 12,000 rpm