Killed the ‘Cat

Practical Sportsbikes (UK) - - On the Bench -

Q: I’d just fin­ished work­ing on my Yamaha Thun­der­cat. It started fine but while let­ting her warm up the rev counter started shoot­ing up to 7000rpm then back to 0rpm al­though the en­gine speed was not ris­ing. The head­light was also dim­ming and bright­en­ing. Then the en­gine died and then there were no electrics at all. Any ideas please? Paul Wright, PS Face­book Group

A: Saul Tow­ers says: The busi­ness with the rev counter in­di­cates a fault code, in this case with the throt­tle po­si­tion sen­sor. How­ever it seems there are fur­ther is­sues here. Check earths, bat­tery ter­mi­nal and block con­nec­tors as well as in this case fuses. Re­trace your steps on the work you were do­ing to see if there’s any­where you might have in­tro­duced is­sues.

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