Why is it that quite a few Breva 750s have badly blued exhaust downpipes and a hotspot just to the rear of the silencer heat shield, and others have unblemished pipes? My wife's bike suffers from blueing, though runs perfectly without popping or hesitation and pulls cleanly and strongly throughout the rev range. Could this be indicitave of a closed-loop problem? The throttle bodies and idling are synched using Guzzidiags and there appears to be no adjustment possible for the mixture.
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Breva 750 blue exhaust pipes
- Thread starter Mickeyluv
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Have you read this
www.guzzitech.com
Bluing is not uncommon. You are not running rich. The pipes are single wall and heat will blue the pipes. You don't have a problem so I recommend not chasing one you don't have.
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www.guzzitech.com
Bluing is not uncommon. You are not running rich. The pipes are single wall and heat will blue the pipes. You don't have a problem so I recommend not chasing one you don't have.
I was thinking the opposite, that it could be running too lean due to a fault somewhere. I read the link you posted - I have zero interest in remapping. The question still remains, why are there many bikes with unblued, or just a slight yellowing of the pipes? As far as I know, all the Breva 750s used single wall pipes.
No question remaining at all. Sorry. You are looking for something that isn't there.
Lots of people, myself included, POLISH our single wall pipes.
They will turn gold or yellow once you stop polishing them. Eventually if you never polish them, they will turn blue as well because they are single wall pipes.
The pipes regularly get polished with every wash, using either Solvol or Peek, but the depth of blueing is too deep to remove without risking the chrome. We were out on a club meet up yesterday and was talking to a fellow owner - his pipes haven't blued despite doing nothing to them.
If you are dead set on not having blue pipes Semichrome makes a product named Blue Away that chemically removes the blue. To me it isn't worth the effort. In my opinion, if the pipes don't turn blue, it isn't running right. The only way I know to prevent pipes turning blue is to apply a ceramic coating to the inside of the pipes when they are new. I did that to a 1973 Eldorado I restored and the pipes stayed nice and shiny.
Well seeing as you are hell bent on finding a problem, may I suggest you pull the spark plugs. If there is truly a problem, the plugs will reveal it straight away.
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Here is what I mean about blue pipes. Bike is not running lean.
Stainless pipes will polish out to a chrome like finish (like in Scott's picture above).
When I have nothing better to do in the winter, I remove the header pipes and get out my big buffing wheel. Makes the bike look like new again. (maybe 3 years or so).
Very slowly, over time they will again turn to straw color, then darker.
Chrome is a whole different animal. Used to use "Blue Away", but it was a lot of work, so if your small block breva has stainless pipes, you just have to work a little harder at it, incl. some disassembly.
When I have nothing better to do in the winter, I remove the header pipes and get out my big buffing wheel. Makes the bike look like new again. (maybe 3 years or so).
Very slowly, over time they will again turn to straw color, then darker.
Chrome is a whole different animal. Used to use "Blue Away", but it was a lot of work, so if your small block breva has stainless pipes, you just have to work a little harder at it, incl. some disassembly.
Guys, time wasting topic covered here over and over again.
To the OP, use search and read. You have an antique motorcycle. Could be a clogged injector or failing muffler. This topic is now locked.
To the OP, use search and read. You have an antique motorcycle. Could be a clogged injector or failing muffler. This topic is now locked.
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