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?

Click here to add your own comments

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
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 long as it's at least as big and fits space for it. I got mine at Home Depot, lawn mower parts dept.

Click here to add your own comments

Return to Q&A Archives - Speed/Acceleration/Power.

When you're done here, you may also be interested in reading some of these popular pages:

If you like to talk scooters, check out our motor scooter forums!

Battery Tender Junior in package

A battery tender like the Battery Tender Jr. can make all the difference in whether your scooter will start right up each spring, after being stored for months.

Just about every scooter owner needs to have a battery tender, sometimes called a trickle charger. Unless you are lucky enough to live in a climate where you can ride all year long, chances are your scooter will be put on ice, figuratively-speaking, for at least a couple months every winter.

One of the key steps in winterizing a scooter is to protect your battery from draining during its "rest" period. This can – and will – happen if you leave your battery sitting untended in your cold scooter over the winter, even if it's in a garage or shed.

Read our review or go right to to buy this highly recommended Battery Tender Jr NOW...


ATTENTION! I have had to delete the Scooter Forum for this site, unfortunately. Despite my best efforts, I could not adequately prevent daily attacks by hackers and spammers. Even though most of their posts did not go public, they still cluttered up my website host's server space, jeopardizing my account. I appreciate everyone's contributions over the past few years and I apologize for having to do this.

Wondering why your scooter question never got posted?

Chances are, there is a good reason. Did you...

If you "checked yes" on any of the points above, then I've deleted your post. Sorry, but I have standards. Feel free to re-submit, following the instructions I have everywhere on the site.

Also... all submissions have to be reviewed by me, and I am currently backlogged. Comments go live without approval, but still take 30 to 60 minutes to show up, so don't repost them, please.

This Week's Highlights

Share Your Scooter Blog Here
Your Help Needed!

We have lots of unanswered questions... can you help? Also, check out our newest eScooter Club members We are growing every week!

Keep Up to Date

Follow us on our Facebook Fan Page Follow our updates on Twitter
Subscribe to my motor scooter blog Subscribe to our RSS feed in your feed reader

Help Us Grow

Support This Site

I support this site by using affiliate marketing and running Google ads. I earn a small commission when you purchase items here, which helps to keep the site afloat. Thank you for your support.

XML RSSSubscribe To This Site

follow us in feedly
Add to My Yahoo!
Add to My MSN
Subscribe with Bloglines