210 engine into 50cc runner frame

hi all im wanting some reliability so i was thinking about sourcing a 210 runner engine and putting it in my runner 50 frame? at the moment i have a 125 engine with 172 bore but its 2 stroke and i fancy some reliability but also steady speed? anyone done this before if so what would i need if its do able? also rough cost thanks joe

 

210 = fail. they are prone a die as the bore is just too big and have 0 reliability
if you want some real reliability use a 100% stock bike

 

So wht stock/reliable engines do I have available to me that can do sort of 80mph?

 

none.

my stock sr 125 would do 75 on the clock so 65(ish) real
80mph on a scooter is a LOT.

 

Runner 180 engine will do 85-90 on the clock as standard.

 

If you want to go that fast buy a bike, I'm sure a cbr 600 will do a steady speed of 80 odd mph!

 

i think im gonna stick with my 125 but buy a new ngf 172 kit for it as the ngf kit on it now looks as if its had its day

 

so real speed 70/75?

 

why are you knocking alot of speed of what the clock says? i done a test on my runner and at me doing 85 my friend in his car was reading 83 so its not the 10-15mph out that your suggesting i also did it with another friend in his golf which read 84 when i was doing 86

 

yer they lie, a lot

 

Unknown, but I would say at least a genuine 80mph.

 

i also though the speedo's lie also but seems they do lie but only by 1-3mph

 

50cc clocks are celebrated to 30mph only. over 50cc are celebrated to 70mph.
there not supposed to go any faster so they would the makers pay to celebrate past that point, i know you think its not out by a lot but they really are.

my old NRG power did 74 on stock gearing with digital clocks? the stock piaggio gearing runs out at 65.

 

i know its no out a lot because ive compared it to 2 cars and another bike thats how i can say its a fact that i know because ive done it lol

 

It'll do a steady 120mph+

 

I think the word you are looking for is calibrate, unless you really want to "celebrate good times c'mon" in a disco stylee

 

Would be intresting.

 

Don't worry, everyone on here loves to preach how the clock speed of every bike is out by 5mph+

 

i heard they was also bad but did some research and there as good as any looked after