Running too lean
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Cruiser
Joined: Jul 2016
Posts: 138
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From: ga
Running too lean
stock evo 1200 except drag pipes,started could only run with choke out and was too rich,rebuilt carb,went from 40 slow jet to 45,from 170 main to 180 but now runs with choke in but plugs are white,lean! Also installed. Easy adjust a/f screw
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Joined: May 2005
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From: A barrier island in NJ
Personally, I would ditch the drag pies and get something on there that will give some back pressure. Drag pipes, aside from being loud, only benefit high-end speeds. Low and mid range running suffer and excessive heat can cause you problems with the exhaust valves. If you're bent on keeping the drag pipes, move up to at least a #48 and #85 jet.
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Joined: Aug 2017
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From: Buffalo, NY
Cruiser
Joined: Jan 2018
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From: Bellevue WA
If you had the carb off and didn't use brand new seals when re-installing I would check for intake leaks.
If you don't already have one of these intake manifold wrenches then I would get one.
I can remove and replace my intake manifold with the tank on using one of these. The only part other than the carb that was in the way was the VOES. EZ PZ.
Craig
If you don't already have one of these intake manifold wrenches then I would get one.
I can remove and replace my intake manifold with the tank on using one of these. The only part other than the carb that was in the way was the VOES. EZ PZ.
Craig
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Joined: Aug 2009
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Modern gas doesn't really color plugs. The insulator SHOULD be white or light tan. You can adjust the insulator color a bit by running a colder spark plug. What you don't want to see is bubbles or a glazed appearance on the insulator, as that is overheating.
45/180 and about 2.5-3 turns on the mixture screw is perfect for a 1200 Sporty. If it's in fact running lean you have an intake leak somewhere or fuel is not being delivered properly.
45/180 and about 2.5-3 turns on the mixture screw is perfect for a 1200 Sporty. If it's in fact running lean you have an intake leak somewhere or fuel is not being delivered properly.
Last edited by Scuba10jdl; Apr 11, 2018 at 09:23 AM.
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Dynojet main jets are sized completely different...
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