My scooter (upgraded, no exhaust)

My Rex RS 450 (Jian Quingqi) is now upgraded with an 82 cc 4 stroke engine kit and started up with no exhaust.

Category:

Autos & Vehicles

Tags:

• scooter
• no
• exhaust
• upgraded
• rex
• rs
• 450
• 82
• cc
• stroke
• quingqi
• chinese
• qmb
• 139
• engine

[KawasakiRocks124]

what size of carb

[HanzelikR]

@KawasakiRocks124 The same original carb.

[FATHOM2356]

What is the maximum speed that this 82 cc engine can achieve?

What are its legality conditions for Toronto? Will it excellerate to more than 32km?

If yes, couldn't you simply maintain a 32 km max instead of going faster? Wouldn't it be considered a scooter like an electric bike?

[HanzelikR]

i have achieved so far 80 km/h on straight road and about 100 km/h downhill (the needle from the spedometer went off the scales). According to the scooter's certiicate, it is considered as a 49.8 cc and the maximum speed is 45 km/h. When i gought this scooter it was limited to the maximum of 45 km/h, the limiter was a simple plate mounted on the variator assembly to prevent the expansion of the variator

[Y0RKSHRE]

smart arse, brand new kit so why not blow the rings by not having a exhaust on. retard

[HanzelikR]

So what infuence does have on the piston rings by running the engine with no muffler? i guess the engine gains 1 hp by removing the muffler! it's a 4 stroke not a 2 stroke. 2 stroke engines get damaged by not using any muffler.

[peckerwood479]

dumbass u will burn it up like that at least put the pipe back on and drill a hole or 2 into it so it will be mean sounding and functionall longer i know frm expirence

[justmartoo]

the exhaust is there for a reason

[CrfKid96]

i love that bubble-machine sound, haha. and actually you need at least a 6 inch pipe on there to not mess up your rings. I have about a 14in straight pipe on mine.

[118donk118]

@HanzelikR 100 kph holy shit bet that was scary did it rattle much?

[sleeksilver]

A tuned exhaust will give you a bit of a gain, but not removing it.

[msnpapske]

@sleeksilver you dont get anything, 4stroke exhausts mainly just prevent dirt from entereing the exhaust connection on the engine, diverting hot air and filtering out chemical crap

[msnpapske]

@vuuvje more cc = more power, with more power you CAN compensate for more friction, so you CAN go faster, but you'd need to removed or replace the limiting factors like speed limiters and in this 4stroke case, the crankshaft eventually.

[msnpapske]

@DoPe993 4stroke exhaust is a joke, if you want 4stroke exhausts to be usefull you need a very very very long tube-shaped exhaust.