Speed fight 2

Bought a gianelli exhaust for my standard 50 speedfight it did about 55 now I've put a 70cc kit on it and a technigas silent sport exhaust on and it won't do over 50?? Any help

 

Have you up jetted? Any other symptoms ?

 

Assuming everything was fitted correctly, Most likely need carb and transmission set up right, I'm going through it myself and it's a pain, especially while running in

 

Haven't done anything except that what jet size should I use

 

I have no idea off the top of my head but im sure you need to upjet for a 70s kit maybe have a look in the tuning section

 

Ok thanks

 

and check for aa restrictor in the new exhaust

 

Where would that be mate? I think the one by the top by the bolts has been taken out

 

Your mixture is running weaker at the top end due to the sports exhaust. Take the main jet out of the carb, read the number stamped on it, add 4 to that number and that's the minimum jet size you need to correct the mixture.

 

Ok will it need to go up any more because I have a k&n style air filter

 

Yeah, that won't help either as that will also weaken the mixture. The air flow has increased inside the engine and you need to increase the fuel flow to compensate.

 

Ok, thanks and should I buy these? http://item.mobileweb.ebay.co.uk/viewitem?itemId=360770708036

 

You need the set that goes above 72. Pedstop, Pedparts or similar will stock the larger size range kit.

 

Ok what should the lowest be?

 

http://www.pedparts.co.uk/product/516/dellorto-stage6-jets-box--5mm would this be ok? In standard carb? Sorry to ask so many questions haha

 

You need the kit that goes from 75 to 98, but Pedparts don't have them in stock at the moment.

http://www.pedparts.co.uk/product/464/dellorto-jets-box--5mm#option587

These are in stock though;

http://www.pedparts.co.uk/product/1085/motoforce-racing-dellorto-6mm-jets-box-jetbox#option1175

You need to know which carburettor is fitted to your bike, e.g. Gurtner, Dellorto etc. as the jets can be 5mm or 6mm depending on the type fitted.

 

It's the standard carb

 

I think gurtner

 

The standard Gurtner carb takes 6mm jets.

 

Could anyone send me a link to a gear up kit I should use? Thanks