Dyno required?

I've noticed recently that when I pull up at a junction theres a distinct odour of petrol, a friend pointed out the same earlier today, it seems its not burning it properly.

I'm suspecting its because I've faffed around with the exhaust quite a lot so is it likely a dyno is all thats required or could it also be some deeper servicing required? its just done 18k so it due some major checking but the most obvious candidate in my mind was the exhaust but I know enough to know I know nothing

What say ye org?

[edit] and if I need to dyno it can anyone suggest somewhere in the north west to do it?[/edit]

[Speedy]

Check for a fuel leak first, playing with an exhaust like you have, (I read your post on your stubby conversion), will not make it run that "lean".

Besides, if we're talking about "lean/rich" fuel mixtures, if you can smell fuel out your exhaust, then I'd say it's running too rich, Plus it would be running BAD if there was that much unburnt fuel coming out the pipe.

Check your tank breather pipes too.

Hmm K, I'll give it a sniff over tomorrow morning, that way nothing should have been coming out of the exhaust yet, hmm although I would expect to see signs on my shed floor if its leaking? will check that over too just incase I've been blinkered, wouldn't surprise me.

Thanks for the input, makes sense what you say.

[Speedy]

Don't forget petrol evaporates very quickly, especially when dripping onto a hot engine or components, hence why you may be smelling it when you stop at lights.
I.e, no air moving over the bike to drag the fumes away.

Also, if you're concerned about "fueling", check the opening of your end can. Look at the colour of the pipe.

Light grey/white= Lean/Very lean (respective) NB if white, seek dealers or tuners to rectify sharpish.

Dark grey/black (but without heavy sooting)= fueling about right, safe until set up properly.

Black but heavy deposits of soot=VERY rich. Not good for power, economy or your engine as you could effectively be "washing" the bores of the very fine film of oil that sticks to the surface of said cylinder bores.

[flymo]

Have a chat with Chris at Dynopro racing in Runcorn. http://www.dynopro-racing.co.uk/index.html?_ret_=return

Originally Posted by Speedy

Don't forget petrol evaporates very quickly, especially when dripping onto a hot engine or components, hence why you may be smelling it when you stop at lights.
I.e, no air moving over the bike to drag the fumes away.

Also, if you're concerned about "fueling", check the opening of your end can. Look at the colour of the pipe.

Light grey/white= Lean/Very lean (respective) NB if white, seek dealers or tuners to rectify sharpish.

Dark grey/black (but without heavy sooting)= fueling about right, safe until set up properly.

Black but heavy deposits of soot=VERY rich. Not good for power, economy or your engine as you could effectively be "washing" the bores of the very fine film of oil that sticks to the surface of said cylinder bores.

just outa curiosity, what do we consider 'heavy sooting'?

[Speedy]

Originally Posted by noob-saibot

just outa curiosity, what do we consider 'heavy sooting'?

What I consider to be "heavy sooting" is when you get a crumbly build up, stick your finger up the pipe, (ooh er missus!), if it comes out powdered black, the same texture as say icing sugar, then I'd say thats heavy sooting.

Picture a car exhaust before the invention of the catalytic converter.

My exhaust is more black than dark grey, but there is no powdery residue.

[Old Git]

Originally Posted by Speedy

What I consider to be "heavy sooting" is when you get a crumbly build up, stick your finger up the pipe, (ooh er missus!), if it comes out powdered black, the same texture as say icing sugar, then I'd say thats heavy sooting.

Picture a car exhaust before the invention of the catalytic converter.

My exhaust is more black than dark grey, but there is no powdery residue.

Interested in this, sorry to steal the thread, I have restrictor washers in a curvy, with aftermarket exhaust on which has black 'sooty' deposits (naughty sooty!, wheres sweep?), is this due to the washers, should I turn down the mix screw on the carbs???
Ta.

hmmm, sooty here aswell. Black lip on unbaffled exhaust and a blackish finger when wiped. Not extremely powdered but black none the less

[Speedy]

A friend of mine who is a bike mechanic, ALWAYS says that restrictor washers always bugger up the way a bike engine runs.

Basically, the engine is getting same amount of fuel delivered, but not enough Air to help burn it.

I rode a bandit 600 with restrictor washers, EXTREMELY rubbish in terms of engine smoothness. It was being strangled and overfuelled.

Removed them and it was sweet, revved cleanly etc etc. Now this should be expected as the point to restricted engines, is exactly that. To restrict.

noob-saibot, my SV runs without the baffle, mines the same. Black, get a slightly blackish finger, however it's not CRUMBLY deposits. It's still clean.

Think back to the days of manual chokes on cars, when you see someone trying to pull away with the choke still on, Black smoke, sooty patch on the road, watering eyes.

Thats what I mean by sooty.