Hey folks,

Been having problems with my 2002 rev 3 250cc,

For the last 2 weeks my bike has been pinging and knocking and running like crap when it gets hot?

I have rebuild top end- Still no good

De-coked everything- still no good

Swapped carb from my friends bike- still no good

changed all oils and water- still no good

tested stator- still no good.

Has any one had this problem before

The bike runs like a dream for the first 20mins of riding then it all goes pete-tong and is un-rideable

?!?! Puzzled ?!?!

The fan coming on and off, yes?

Check your fans working and coolant circulating

The fan coming on and off, yes?

yup, fan runs like clockwork, not long had new thermostat and impeller!

Tried a new spark plug? Could be breaking down with the heat.

Tried a new spark plug? Could be breaking down with the heat.

This is the one thing i have not replaced but i will at some point, The spark plug in there seems to be in perfect condition

I would check your timing and the woodruff key, heat is a strange thing, could be that the flywheel is twisting a bit and putting your timing out...Worth a try

Often this is from a bad batch of petrol.

Its def not the woodruff key because i have had flywheel of when checking stator,

Bad batch of fuel is possible i i normally get mine from Tesco

Hi,

Stator could be breaking down with increase in engine temperature. I also have a 2002 Beta Rev 3 250 and my stator problem caused the bike to cut out after about 3/4 of an hour running. It would restart after cooling down. I had it rewound but then it wouldn't rev (problem with high speed trigger) so I bought a new one from Lampkins.

I am very interested in you're problem as mine runs poorely under load. It sounds like it's 4 stroking or pinking and doesn't pull cleanly. I've tried everything and would now like to find someone with a similiar bike to swap things over. I've replaced the stator, coil, HT lead, plug, rebuilt the carb, flywheel, new main bearings, and a new piston. I've tried replacement CDI, stator, and coil just incase one of the new items was faulty. I live in Northamptonshire, Nr Banbury. Anyone got any ideas?

Bad batch of fuel is possible i i normally get mine from Tesco

Try running a tank of Super unleaded through it every half dozen tanks or so and I'd avoid Tesco's, I always get my bike petrol at the local Shell, know what I'm getting that way.

Hi,

Stator could be breaking down with increase in engine temperature. I also have a 2002 Beta Rev 3 250 and my stator problem caused the bike to cut out after about 3/4 of an hour running. It would restart after cooling down. I had it rewound but then it wouldn't rev (problem with high speed trigger) so I bought a new one from Lampkins.

I am very interested in you're problem as mine runs poorely under load. It sounds like it's 4 stroking or pinking and doesn't pull cleanly. I've tried everything and would now like to find someone with a similiar bike to swap things over. I've replaced the stator, coil, HT lead, plug, rebuilt the carb, flywheel, new main bearings, and a new piston. I've tried replacement CDI, stator, and coil just incase one of the new items was faulty. I live in Northamptonshire, Nr Banbury. Anyone got any ideas?

It seems you have the same problem as me, Im lucky in the fact that i got a few mates with trials bike one being exactly the same bike as mine, Its really bugging me now tho. . . I have tried all the obvios like you have and still no joy, My next plan of attack is a new spark plug and some fresh fuel (Not tesco) Even though i have alwas ran it on tesco 99 and it has been fine?!?!? Wierd eh?

Not that weird. I used to run Sunoco Ultra and on occasion the bike would run really terrible for a few weeks. Could never quite figure out why. Finally after it stalled halfway up a rock and deposited me, tender parts first, on a stump I switched to racing fuel and bikes have run faultless and consistant ever since. That was in '89 I think. You would think that premium fuel from a supposed known source would be consistant but that isn't the case.

Edited March 11, 201016 yr by Dan Williams

Found out the problem,

STATOR!!!!!

Bloody things are

You can get em rewound for a lot less, i was gonna ask if you ruled out the kill switch, was out with a friend on his Beta on the weekend and he had problems as you describe we disconnected the Kill and problem gone.