Running Rich

[Grant66]

The exhaust and plugs suggest that the engine in running a little rich, since I changed the exhaust to a fuel slip-on can (bit sooty). I get around 130miles on a tank and it seems to run OK (sounds great), before the exhaust change was getting 120mile per tank.

Various places suggest that if I was to put a K&N filter in it would run leaner (more air).

So do I:

a) Leave it alone, its running all right don't f*** around with it.

b) Stick a better flow air filter in, it'll lean it up a bit. Might be all that's needed.

c) Change the air filter and adjust the idle mixture using a colour tune plug.

d) Re-map the carbs (yes its a curvy) and enter a whole new world of hassle.

Don't care about extra power (cause I won't get any), would just like the fuel mixture to be right and not soot the plugs up (although this hasn't caused any miss fires etc).

Thoughts?

[Dave20046]

I'd try with a race filter personally (BMC are the recommended ones IIRC), but you could always mess around with the jetting (or leave it alone!)

I have the same thing, bike rides lovely but plugs suggest it's running very rich - slightly less options on the pointy though...

[Biker Biggles]

You could start by checking your choke plungers and cables as these stick and cause rich running.

[Grant66]

Originally Posted by Biker Biggles

You could start by checking your choke plungers and cables as these stick and cause rich running

Did that on Saturday, froze my n*** off at least the engine kept my fingers warm The running rich started to show signes after changing the can, just haven't got round to doing anything about it. Its due a filter change, so was wondering to go for OEM or 'improve' the flow to reduce the richness (is that a word?).

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