running lean - Honda Rebel Forum
 
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post #1 of 5 Old 04-04-2019, 08:48 PM Thread Starter
 
Join Date: Feb 2019
Posts: 61
running lean

got the rebel out really for the first time since carbs rebuild by jacks, ran 20 miles, exhaust turning blue and plugs grayesh white, also noticed at 55 mph in 5th felt like it was starving for fuel, what adjustment can I make, have not adjusted the idle mixture screws but they should not make a difference at highway speeds. both cylinders the same color on plugs and exhaust. ideas?

86 rebel 450
82 450 nighthawk
97 vette
kennedy759 is offline  
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post #2 of 5 Old 04-06-2019, 08:48 PM
 
Join Date: Nov 2016
Location: Chandler, AZ
Posts: 775
First you need to find out what jets are in the carbs. If they are stock, you may have a vacuum leak or a low float level. Also check the pilot air screws. They do make a difference above idle. Unfortunately I have never worked on Rebel 450 carbs, but I am assuming they are pretty much the same as any other CV carb.
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post #3 of 5 Old 04-07-2019, 12:15 PM Thread Starter
 
Join Date: Feb 2019
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Quote:
Originally Posted by JerryH View Post
First you need to find out what jets are in the carbs. If they are stock, you may have a vacuum leak or a low float level. Also check the pilot air screws. They do make a difference above idle. Unfortunately I have never worked on Rebel 450 carbs, but I am assuming they are pretty much the same as any other CV carb.
everything stock, will adjust pilot air screws next and see if that helps,

86 rebel 450
82 450 nighthawk
97 vette
kennedy759 is offline  
 
post #4 of 5 Old 04-07-2019, 11:20 PM
 
Join Date: Nov 2016
Location: Chandler, AZ
Posts: 775
Something is causing it to run lean (not enough fuel in the air/fuel mixture) aside from the carburetors themselves, about the only things that could cause that are a vacuum leak (which is not likely on both sides with 2 carbs) or a non stock air filter or exhaust. Pod air filters and open pipes can lean it out so much that the carbs cannot be tuned enough to cope with it.
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post #5 of 5 Old 04-08-2019, 12:29 PM Thread Starter
 
Join Date: Feb 2019
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Quote:
Originally Posted by JerryH View Post
Something is causing it to run lean (not enough fuel in the air/fuel mixture) aside from the carburetors themselves, about the only things that could cause that are a vacuum leak (which is not likely on both sides with 2 carbs) or a non stock air filter or exhaust. Pod air filters and open pipes can lean it out so much that the carbs cannot be tuned enough to cope with it.
went back and checked all the rubber boot connections to the carbs, the left one was loose from the carb to the air box, now it is not running lean, on the right one bolt from the boot to the engine was a qtr turn loose from where I loosened it thinking that was the way I was going to remove the carbs, ended up not taking the front boots off. BUT when I did have the carbs off, checking the front boots I could see fuel residue around where the o ring sits, so I think it is leaking air between the boot and engine. So wondering if I can loosen the boots enough on both carbs to replace the o-rings or can I use a RTV sealant since its in a vacuum to seal it? also the right carb needed 3/4 of a turn richer on the idle mixture screw

86 rebel 450
82 450 nighthawk
97 vette
kennedy759 is offline  
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