Q Why is my R1 mak­ing black smoke sig­nals?

Motorcycle News (UK) - - Garage -

I have a fuelling prob­lem with my 2012 Yamaha R1. It will be run­ning fine on a small throt­tle open­ing and then ran­domly start hes­i­tat­ing/run­ning rough un­til I open the throt­tle fur­ther. When it hes­i­tates the trip-com­puter shows the fuel con­sump­tion plum­met­ing from 4050mpg to 15-20mpg, and as I open it up mates be­hind see a black cloud from the Akrapovic ex­haust and smell petrol.

I’ve had the bike into a Yamaha dealer three times to have an 8000-mile ser­vice, a new bat­tery, a Power Com­man­der and re­place­ment throt­tle bod­ies. I think the pre­vi­ous owner had an ECU flash. I have just about run out of pa­tience and money to cure the prob­lem. David Ray­mond, email

A An­swered by Charles Marvell, Fl­itwick Mo­tor­cy­cles You need to bite the bullet and get the bike on to a good dyno with some­one who knows what they are do­ing. This will pin­point what is hap­pen­ing to the fuelling.

Power Com­man­ders will not cure a se­ri­ous un­der­ly­ing prob­lem, they are there to marry the fuelling to a new set-up (eg an aftermarket pipe) and take out the dips put in to achieve the nec­es­sary Euro emis­sions spec.

If all else fails, then go­ing back to stan­dard is re­ally the only way to go, at least it will give you known base­lines from where to pro­ceed. Un­for­tu­nately, this is an ex­pen­sive busi­ness with your Yamaha, need­ing a com­plete ECU and ig­ni­tion switch kit.

It’s a stark warn­ing re­gard­ing the buy­ing of non-stan­dard ma­chines; you have to won­der why the pre­vi­ous owner sold it?

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