gilera runner 172 backfire?

right my gilera runner 172 was running good, but i noticed at top speed it backfired like once or twice but ran fine, i checked the plug and it looked good, but i noticed one of my fuses had blown as well, the 15watt one, anyways driving back it backfired loads top speed and now at half throttle it keeps jerking forward and backwards. and it cut it twice at the lights. the battery light comes on when it cuts out if thats any help?
any ideas?

 

bump anyone? :beg:

 

ok mate will stip the panels off it sunday. and the battery warning light stays on when i turn the ignition on so im asuming it must be something electrical? and tbh i think the fuse might have been a coincedence but you never know, i did change the panels before i had this problem so i might have knocked a wire out of place, also they are 2 main thick wires conected to the red part of the battery is this correct? my typhoon and sr both only had 1 thick wire conected to the battery?

 

well the battery isnt dead so something electrical is fucked :cray:
how can i 100% make sure its of them thats fucked? what can i do to spot the problem?

 

sounds exactly like what happened to my 172 (backfire, etc)
the key in the crank let the flywheel grind the stator to shit

 

say again ? lol sounds like my bike is fooooked

 

well im not saying that that's whats happened to yours lol

 

how did you find out it was that mate? what do i need to look for?

 

If the supply power is low from the bat because of non charging then it will backfire and fart as and degenerate until the bat is flat.As Minor said if the rectifier is dead the you are getting no charge to the battery,(this changes the AC from the stator to DC to charge the battery.
A multimeter is needed to test this.

Paul

 

ok sweet, just need to take it to a shop then and get it checked out, hopfully will be an easy fix!