Major Loss of power in Aprilia SR 50cc

Joelpeters · L Plate Warrior Joined: 03 Nov 2011 Karma :

Ive recently inherited a 2000 Aprilia Sr 50cc scooter from my parents which has been sat in the garage for about 4-5 years. got insured on it after an MOT and have been riding it for a week could get 50 mph quite easily. was driving up a slight hill to my girlfriends when power droppped significantly barely could hit 20 mph. also noticed starting up being a problem taking a lot of throttle to get it going. got it home had a look at the spark plug which is fine, tried to start it up and the engine seized! had a dude free it at a local garage and run compression tests which say it is fine. it is not overheating either. had another ride on the estate and on full throttle it really struggles to get anywhere. the engine starts up it begins to get going but after 5 secs the power massively decreases. i dont know whats going on but if anyone has a clue would be very handy! thanks!

Quornholio · World Chat Champion Joined: 11 Jun 2011 Karma :

Hang on, you've seized it, then carried on running it? Confused

andy_uk · World Chat Champion Joined: 13 Aug 2011 Karma :

Does it have 2stroke oil in the oil tank?
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Aprilia Classic 125, GS500E, ER5-A1, ER5-C4, ER6 & an XJ6 project frame...

P.addy · Red Rocket Joined: 14 Feb 2008 Karma :

You might want to actually check the compression yourself. Compression isn't a 100% indicator that its fine. My RS said it was at 130psi even though the main bearings had shat themselves.

Joelpeters · L Plate Warrior Joined: 03 Nov 2011 Karma :

well it seized after i cleaned the spark plug and fired it up again (kickstart wouldnt budge!!) checked the oil and there was some in there for sure, the oil indicator didnt come on anyway. took the bike to a garage and the dude freed it up there so ive rode about on it since then but with this major loss of power. yeah compression said 130 funny enough. not confident myself opening the engine up would rather have it done properly but dont want to be paying shit loads? i was thinking even maybe if it came to it getting a new engine but saying that, the fault may not lie in the engine!

Quornholio · World Chat Champion Joined: 11 Jun 2011 Karma :

If the engine makes the power for it to move, and there is a loss of power, it's a good chance it's engine related.

dobby · Nitrous Nuisance Joined: 09 Mar 2010 Karma :

chances are that it is nipping up, check the variator isnt sticking or belt hasnt worn its self out or freyed