• Ciao Guest - You’ve landed at the ultimate Guzzi site. NEW FORUM REGISTRATIONS REQUIRE EMAIL ACTIVATION - CHECK YOUR SPAM FOLDER - Use the CONTACT above if you need help. New to the forum? For all new members, we require ONE post in the Introductions section at the bottom, in order to post in most of the other sections. ALWAYS TRY A SEARCH BEFORE STARTING A NEW TOPIC - Most questions you may have, have likely been already answered. DON'T BE A DRIVE-BY POSTER: As a common courtesy, check back in and reply within 24 hours, or your post will be deleted. Note there's decades of heavily experienced Guzzi professionals on this site, all whom happily give endless amounts of their VALUABLE time for free; BE COURTEOUS AND RESPECTFUL!
  • There is ZERO tolerance on personal attacks and ANY HYPERLINKS to PRODUCT(S) or other competing website(s), including personal pages, social media or other Forums. This ALSO INCLUDES ECU DIAGnostic software, questions and mapping. We work very hard to offer commercially supported products and to keep info relevant here. First offense is a note, second is a warning, third time will get you banned from the site. We don't have the time to chase repeat (and ignorant) offenders. This is NOT a social media platform; It's an ad-free, privately funded website, in small help with user donations. Be sure to see the GTM STORE link above; ALL product purchases help support the site, or you can upgrade your Forum profile or DONATE via the link above.
  • Be sure to see the GTM STORE link also above for our 700+ product inventory, including OEM parts and many of our 100% Made-in-SoCal-USA GTM products and engine kits. In SoCal? Click the SERVICE tab above for the best in service, tires, tuning and installation of our products or custom work, and don't miss our GT MotoCycles® (not) art on the BUILDS tab above. WE'RE HERE ONLINE ONLY - NO PHONE CALLS MADE OR RECEIVED - DO NOT EMAIL AND ASK QUESTIONS OR ASK TO CALL YOU.
  • Like the new V100, GuzziTech is full throttle into the future! We're now running on an all-new server and we've updated our Forum software. The visual differences are obvious, but hopefully you'll notice the super-fast speed. If you notice any glitches or have any issues, please post on the Site Support section at the bottom. If you haven't yet, please upgrade your account which is covered in the Site Support section or via the DONATE tab above, which gives you full site access including the DOWNLOADS section. We really appreciate every $ and your support to keep this site ad-free. Create an account, sign in, upgrade your account, and enjoy. See you on the road in 2024.

uneven bluing on exhaust tubes

Y

yukonica

Tuned and Synch'ed
GT Contributor
Joined
Feb 25, 2014
Messages
60
Location
Whitehorse, Yukon
Pretty simple question; perhaps.
I'm noticing a significant difference in discolouration in the two exhaust pipes.
One is deep blue; the other closer to royal purple tinged in gold. The distance of the discolouration from the exhaust port is roughly the same 8 or so inches to the down turn.
I do notice a tiny amount of carbon residue at the muffler outlet on the side that is blue.
It appears the gasses in the cylinders are exiting at different temperatures. Would this be a correct guess?
I also hear a very slight stumble when the bike is warm and at idle. Do I need to re-gap the valves?... on the Blue side?
Or, could it just be a slight difference in metallurgy or chrome plating on the two pipes?
 
Single throttle body or dual throttle bodies? If the former, I'd suspect the valve lash. For the dual TB it could be TB balance, valve lash, or maybe even a problem with the O2 sensor.

Peter Y.
 
My 2004 Breva 750 (2TB) had uneven pipe coloration. It stumbled, bucked, and blubbered - until I had the ECU reflashed by Todd on this board.

Over the next 10,000 miles the pipe coloration evened out and the bike now runs perfectly. Hard starting and pre-warmup problems disappeared. Transition from throttle off to throttle on is smooth as silk. It is an absolute pleasure to ride now.

'Geezer
 
Hello Peter, this bike is a 2013 model. Fuel delivery should be pretty consistent. That is why I thought about the valves.
Did the first service myself so 'operator error' is high on my list.
Regarding MotoGeezer recommending a re-flash... that is also high on my list. I've bought a set of mid-level shocks from Todd. Once those are installed I'll pester him about the front end. By then, 8 months of winter will have set in and I'll have time enough to have the ECU worked over.
thx to you both.
Yukonica.
 
You must log in or register to reply here.
Back
Top