Any idea why my Derbi Red Rocket scooter engine is dying at full throttle?

by Adam
(Perth City, Western Australia, Australia)

Hi... I have a Derbi Red Rocket 50cc scooter, 2 stroke, auto oil feed, air cooled. The fault in question is the engine loses power on full throttle and is sluggish at 1/2 throttle after approx 2-3 mins of starting it.


I experienced this fault a couple of times before. Briefly when going up steep hills, I come to a stop to let cars past (it doesn't stall), I ride off and it's fine. Happened about 2 times in the last month.

Now today as I ride home from work, the bike completely loses top end power (still doesn't stall) but keeps its loss of power. I have tried it after leaving it a while to cool, but still loses power after 2-3 minutes every time now.

I suspect a blocked carbi valve poss into the float chamber? Can anyone verify or help on this issue?

Comments for Any idea why my Derbi Red Rocket scooter engine is dying at full throttle?

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Jul 25, 2014
I had the same problem NEW
by: bill

I got it fixed it was a broken O ring on my intake valve now it runs fine

Mar 12, 2011
fixed it!!!
by: Anonymous

Hi... I'd like to take this opportunity to thank everyone who replied with an opinion about fixing the fault I was experiencing with my little scooter. After stripping the scooter extensively I finally found the fault.

I stripped and cleaned the carb, fuel tank regulator valve, pressure tested the reed valve and inlet, compression test, tested the spark plug and ht lead and checked for engine seizure. All were OK with no faults.

I finally found a carbon blockage in the exhaust after a bend in the pipe. Cleared and cleaned it and now it runs better than ever! Thanks again to all that tried to help. :)

Mar 06, 2011
fuel filter
by: adam

hi thanks for the help ive looked for the fuel filter but cant find one i just have 2 pipes off a kinda regulator on the tank that go to the carb. should fuel run freely from the reg?

Mar 06, 2011
Fuel
by: willis

ditto check the fuel filter, or hoses to and from the carb. possible vacuum leak.

Mar 06, 2011
1st thing to do
by: WPB Joe

I had my reliable 150cc die on me a few weeks ago.

I located and changed the gas filter (should be one of the easiest things to do)

Hope that helps.


Note : doesn't have to look exactly like the one you remove...as long as it's at least as big and fits space for it. I got mine at Home Depot, lawn mower parts dept.

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