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Oct 11

Posts: 9

mafakin says:

The sound of big singles

I have recently purchased and am pleased with my mt-03

However, when I throttle back and change down there are a couple of soft back-fires - that is the best way I can describe it. Is this normal - I am not used to this type of engine. Perhaps modern engines burn lean because of emmisions and this causes it? 

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  • Posted 3 years ago (11 April 2012 19:00)

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Aug 09

Posts: 2721

MarcusMarsh says:

Big singles

A bit of popping and banging on the over-run is not uncommon on a big single.  It is part of their charm :smile 

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Mar 09

Posts: 9029

jaffa90 says:


Sounds about right as Marcus states,if that`s your only problem your lucky.Are you getting any spitting back or coughing at any constant revs as 3000rpm?

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Jan 11

Posts: 204

frazmataz says:


miss my MT03:upset:

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Jan 08

Posts: 7744

kcmc says:

Yamaha MT-03 year?

Hi Mafakin

More info.

What mileage is the bike?if the bike has after market exhausts it could back fire as cold air is drawn back up into the headers on the over run,this can also happen if the exhaust is not sealing properly at a joint.Check the colour of the spark plug,it could be running a little rich?dirty air filter,or it could be a air induction valve problem?.Sometimes these emission control devises cause problems like this by allowing to much fresh air into the exhaust system again with the same effect as a leaking exhaust system,it can be blanked off on the exhaust side only not the breather from the camshaft chamber above the inlet though.Good Luck


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