Glowing exhaust header - Suzuki ATV Forum
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post #1 of 12 Old 08-16-2019, 08:09 AM Thread Starter
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Glowing exhaust header

So I've seen two different schools of thought on the glowing cherry of the exhaust header on air/oil cooled King Quad 300F. One is that it's normal on an air/oil cooled design like this when sitting idle or moving slow and the other that it's too hot by being too lean and needs the pilot/mix screw turned out to richen the mixture. What is the hard facts about this issue really? Lol.
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post #2 of 12 Old 08-16-2019, 08:48 AM
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It's both......But mainly running lean ( all air cooled will heat up if not moving especially it hot weather)

Most common reason is that the idle circuit jet is blocked to some degree......

2002 King Quad 300
2001 King Quad 300
1997 King Quad 300
1997 quad Runner 250 2x4
2008 Kawasaki 250 Bayou 2x4
2013 TaoTao 110
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post #3 of 12 Old 08-16-2019, 02:20 PM Thread Starter
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Ok. I guess I'll try backing the pilot screw off a little after I try to determine how far out it already is.
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post #4 of 12 Old 08-16-2019, 03:06 PM
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If the jet is blocked......that's not going to fix the problem ( might help some for a while)

2002 King Quad 300
2001 King Quad 300
1997 King Quad 300
1997 quad Runner 250 2x4
2008 Kawasaki 250 Bayou 2x4
2013 TaoTao 110
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post #5 of 12 Old 08-16-2019, 03:22 PM Thread Starter
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Right. I wouldn't think it was blocked so much since I had it cleaned/rebuilt a while ago and a fuel filter put on at the same time. It runs pretty good even now but I'll monitor it nevertheless.
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post #6 of 12 Old 08-16-2019, 06:11 PM
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If it is a CV type carb, it is an air screw, (before the slide) so backing off leans it out more.

Regular carbs the screw is a fuel screw, back out to add fuel.

Easiest way to tell the difference between a CV and a normal carb is the throttle cable controls a butterfly valve on CV carbs, it controls the slide on regular.

Not sure what years Suzuki used the CV carb on, but my 1990 has one, but the 1989 does not.

2013 Suzuki King Quad 500 AXi w/EPS
1990 Suzuki LT-4WD 250
and lots of snowmachines
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post #7 of 12 Old 08-16-2019, 09:28 PM
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Buy a carb rebuild kit. My 300 was glowing and after rebuild it was back to normal.

2000 KQ300
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post #8 of 12 Old 08-19-2019, 05:50 AM Thread Starter
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It's a 2000 with a CV carb. Has a pilot/mix screw on the engine side of the carb.
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post #9 of 12 Old 08-19-2019, 08:12 AM Thread Starter
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Quote:
Originally Posted by markzrt1 View Post
Buy a carb rebuild kit. My 300 was glowing and after rebuild it was back to normal.
It could be that but it could also be the mix screw was set correctly after you rebuilt it or you eventually unclogged a jet too, couldn't it?
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post #10 of 12 Old 08-22-2019, 09:30 AM
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Definately not normal. Usually when running lean the engine will miss badly especially under load. The idle mixture screw only controls the mixture at idle. The main jet controls the mixture above engine idle speeds. At least two other possibilities exist: vaccum leak, & burnt exhaust valve. The rubber flex intake manifolds are notorious for leaking against the head. I've sucessfully used RTV silicone to seal these. You can test for a leak by spraying carb cleaner around the base at the head with the motor at idle. If it speeds up the engine is drawing in the added fuel via the leak. Let's not talk about the burnt valve. It's bad news.
Happy diagnosing!
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