[email protected] 0 Posted December 28, 2021 (edited) Hiy there bought a seezed bike trx 420 2007 fuel injection , fitted new top end over hall Oem parts, starting bike up now exhausts glowing red, all timming marks are bang on also split to look at cam gear it's also lineing up, thanks graham Edited December 28, 2021 by [email protected] Share this post Link to post Share on other sites
Fishfiles 20,147 Posted December 28, 2021 Hi Graham , glowing red exhaust could be over fueling from running rich , like too big a jet , but since your fuel injected it is not a jet , makes me wonder if that 420 has some kind of tuner on it ?? ----- Or the exhaust is plugged / stopped up Share this post Link to post Share on other sites
[email protected] 0 Posted December 28, 2021 Hiy there thanks fishfiles, Also tryed removing the exhaust back box, front pipe still glowing red, ones I had the pipe of and had it running it is like a fire the whole time through exhaust Share this post Link to post Share on other sites
Fishfiles 20,147 Posted December 28, 2021 Grahan , does your 420 have a oxygen sensor delete ??? Seems you bought it pre-owned Share this post Link to post Share on other sites
[email protected] 0 Posted December 28, 2021 Fishfiles, I am unsure if it has a oxegen sensor delete, it doesn't have one in the exhaust if thats where it is suppose to be thanks Share this post Link to post Share on other sites
Fishfiles 20,147 Posted December 28, 2021 1 hour ago, [email protected] said: Fishfiles, I am unsure if it has a oxegen sensor delete, it doesn't have one in the exhaust if thats where it is suppose to be thanks I just looked , it seems the oxygen sensors started around 2014 and up Share this post Link to post Share on other sites
Melatv 797 Posted December 28, 2021 Hi: Here is a good read for red hot exhaust 12 Most Common Reasons for a Glowing Red Hot ATV Exhaust | BoostATV.com 3 Share this post Link to post Share on other sites
shadetree 5,977 Posted December 29, 2021 9 out of 10 times, a red hot exhaust tells me the engine is running lean ?, or the exhaust system is stopped up ?. chances for either are 50-50 shot. 1 Share this post Link to post Share on other sites
[email protected] 0 Posted December 29, 2021 Thanks shadetree, I have removed the rear muffler and left the front pipe on, it's still glowing, could it possibly be the throttle body I have never done much with these thanks Share this post Link to post Share on other sites
shadetree 5,977 Posted December 30, 2021 15 hours ago, [email protected] said: Thanks shadetree, I have removed the rear muffler and left the front pipe on, it's still glowing, could it possibly be the throttle body I have never done much with these thanks a clogged fuel injector will make it run lean. check the air filter too. 1 Share this post Link to post Share on other sites
