Performance problem

[freddie558]

I have a 1999 GSX 1300 Hayabusa engine fitted to a 1959 Isetta! There are two problems which someone might be able to help me with. First, if I take it out for 20 miles or so, once it has got hot, even though the temp shows OK, it starts to lose power. If I try to accelerate it coughs and stutters and will not accelerate but it will keep going (just). When I change gear and it is in neutral the revs rise for a second and then settle. It does not do this when cold and may indicate that it is an electrical problem once the engine is hot.

Secondly, if I try to restart it when it is hot it is as if it has a flat battery and it will not turn it over but if left for a while it then starts it.

If you are interested there are a few pics at: www.freewebs.com/benjy911

Any ideas?

 

[CoolBUSA5454]

Sounds like a sensor is faulty in the FI system. As far as difficulty when hot, welcome to the club. Just gotta keep pecking away.

 

[Charlesbusa]

Mine can be difficult to start when its still hot from a ride. But I bought a high output battery that puts out 235cca and haven't had a problem since.

 

[freddie558]

It works - thank you for your replies.

I read elsewhere that there were issues with the fuel injector pump and I have replaced it.

It's as good as new - the bubble is back!