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General => General Discussion => Topic started by: vermiselle on May 21, 2020, 08:19:01 PM

Title: 49cc 2t (red line)?
Post by: vermiselle on May 21, 2020, 08:19:01 PM

What is the (red line) in RPM for a 49cc 2T to be safe? ::)
On my digital RPM, top speed 45mph @ 8900rmp with variator rollers 7.5g.

Thank's

Title: Re: 49cc 2t (red line)?
Post by: dan v. on May 21, 2020, 09:10:10 PM

Red line -or top rpm on a two stroke is generally a function of the cylinder/porting/pipe.  Longevity at high rpm is related to the crank given that lubrication is sufficient.

The OEM cranks in Kymco 2strokes are good for high rpm 10-11,000 rpm.  You shoud be good, even with hot rod parts that may be installed.

Others, such as the Minarelli,  crank should be replaced if hot rodding, as they will not handle the higher rpm for long.

You will be fine - no worries!

Title: Re: 49cc 2t (red line)?
Post by: vermiselle on May 21, 2020, 10:19:40 PM

I only have a Tecnigas Next R, Polini variator, original carburetor and airbox (no restriction)...