97 F650 rejetting with stock jets...how could it have gone so wrong?
f650 funduro 97 45000 miles
I bought the bike with 11000 miles on it a few years back. The previous owner had rejetted, cut holes in the air box and put a performance pipe on to match. I didn't think too much of this at the time but... the engine had been running so rich I started to call the bike little piggy. It was backfiring and behaving badly, black smoke etc.. so
I changed the pipe for stock and adjusted (thanks to my friends) the aftermarket jets. but still it was using too much fuel. So I thought why not go back to the original stock jets. I had them installed in January and things were going fine until, the bike sat for about a month while I waited on a new starter switch to be sent from the states. It had started to stall a bit before that, but not too bad. Now the plugs are fouled within a day... black as night, and the bike won't start without a new set put in. I have a good mechanic working on it here and he says the jets are too big and letting too much gas in. He wants to try smaller jets.
Have any of you run into this problem on the f650?
Does anyone have any information on aftermarket jets that are smaller than the stock. I found some info on f650. com website but they were for bigger jets.
also the airbox was modified..... should I go ahead and buy a new airbox and try that?
How about problems with running the engine too lean with little tiny jets? Should I be worried about that as well?
Thanks
Susan
Last edited by Homer Susan; 23 May 2007 at 01:19.
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