Derbi gpr50 polini 80cc
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Uploader Comments (50ccpower)
All Comments (15)
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met je pannenkoek
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i havent checked top speed due to poor weather and having a puncture at the moment.. but i get a TRUE 68.2 at 10,000 revs
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I have seen the jolly moto exhaust and they are meant to be very good and a high revving pipe. It's not the size of expansion chamber that decides the max rpm is it? Because i have another exhaust, custom made by someone and it will allow a bike to rev to 13500rpm. And the expansion chamber isn't that big, just a short exhaust similar shaped to the metrakit pro race exhaust.
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i bought it off ebay.. i just looked for a 420 pitch sprocket because thats the pitch of the chain..
only problem is its drilled so that when you put the plate over the top, the grooves line up perfectly :( .. so i just used my grinder to grind to little indents in the side of the plate that bolts on the front of it.. and then bolted it on..
yeh its not to bad.. although you have to cruise at higher revs, because my bike has power from say 8.5K all the way up to like 13000 or something (pto)
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where u running a malossi mhr 80cc? the difference between the standard malossi and the mhr is: the mhr is where the malossi uses only 1 piston ring (as opposed to 2 in every other displacement kit) plus they use it in their track-only bikes so the squish could've been reshaped and the head could be shorter (decked) for more compression, but u can to that at a local machine shop for wayyy cheaper than buying the kit. did any1 run jolly moto exhaust on their GPR? the expansion chambers are huge!!
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Mjj4 Where did you get your 17 tooth front sprocket and what sort of acceleration does it have as i was thinking of getting one, are you running a polini 80cc with that setup and speed. Does yours rev to 12000rpm with that gearing and what was the true top speed you have had out of it
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top speed?
xristakosgr 1 year ago
@xristakosgr
top speed is a genuine 75mph/120kmph, the bike is not at top speed in the video.
It's doing roughly 100kmph/ 60mph.
50ccpower 1 year ago
... or something rediculous (ive never revved mine past about 11300 while riding..
but yeh it would easily pull 12000 if i revved it that high.. it pulls anwhere from around 9k is the limit.. anything under that and it cant pull it.. il get a top speed for you tomorrow or somewhen (:
mjj4 3 years ago
Thanks for the info, did you manage to get a top speed from your bike, Had mine clocked by a car and it was at a genuine 70mph but had about 250rpm left so should do 72mph.
50ccpower 3 years ago