Question about 1979 kawasaki Z 650 SR

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On my 1979 kawasaki z400 the throttle side header pipe glows red if left to tickover can not find blockage in carb or air leak but the fuel tap will only work on the pri position is this my problem not letting the petrol in fast enough to that cylinder

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No, it is more likely a bent exhaust valve or burned. The fuel flow position may indicate an additional issue with the carb, but the exhaust should not glow red like that- when it does it means there is unburned fuel and burning combustion gasses entering the pipe.

If the bike is hard to start, this can be why as well. Do a static compression test to see if the valves are leaking.

Posted on Oct 29, 2012

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Posted on Jan 02, 2017

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SOURCE: Kawasaki EL250 carburettor

Turn off the gas and remove the float bowl. Remove the fuel line. Remove the float pin and float with needle valve. Do not bend the tang that the float needle sits on. Spray carb cleaner into the seat where the needle valve came from to clear out any trash in the valve casing. Spray the float bowl and interior of the carb. Remount the needle and float back in place and put the float bowl back on. Install an in-line fuel filter. The diagram below shows a 1994 carb Yours will be the same or close to it.

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Posted on Jul 03, 2009

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SOURCE: Kawasaki ZZR 250. Engine hydrauliced after fuel

sounds like you blew a set of piston rings. instead of building compression in the cylinder its pressurizing your crank case forceing the oil out the breather into your air box

Posted on Dec 19, 2009

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2 Answers

I have a Honda xr 100 dirt bike when running exhaust seems to get red hot in front pipe on bike is there a problem


Hi, Shaun on a 2 stroke no on a 4 stroke yes and the usual suspects are:
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4. Massive air leak.
5. Intake manifold cracked or damaged.
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For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
http://motocrosshideout.com/2012/06/17/is-a-glowing-red-head-pipe-okay
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1 Answer

My side by side is running at half throttle and the muffler gets blood red hot like its flooding


I'm not familiar with your vehicle, but if it was a road car I would guess at:
Oxygen sensor
Failed catalytic converter
Cylinder head problem.

There's either an air/fuel mixture problem finding its way into your muffler (and is burning inside it) or red-hot exhaust gases (because of a head problem) finding their way direct into the pipe.

I would doubt that there's too much fuel as such - an over supply of fuel tends to 'choke' and make an engine sluggish. A weak mixture - ie, too much air for the amount of fuel - causes overheating.

If you can, check for air leaks - air being drawn into the fuel system. This can cause overheating, though I can't say I've ever come across a muffler glowing red hot because of it.

Then again .. if it's running at half power, that does suggest an over -rich fuel/air mixture

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I have a Kawasaki zephyr 750 after I cleaned carbs the header glows red after I start it and let it run for a few mins. I put hotter pugs in it last year when I had carb trouble could that be it? (All four...


A hotter plug could cause the piston crown to melt (depending on how much hotter) The reason engine makers give a recommended spark plug is because this grade will give the best performance and efficiency. Try reverting to the correct grade.But the headers glowing red is not unusual as not all header pipes are twin wall tubing.

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2007 yamaha yz450f... while riding last week it was backfiring on deceleration. it blew a 5 inch hole in the header pipe. i purchased a new one, cleaned the air filter, changed the oil and put a new spark...


Exhaust leaks near the exhaust port can draw air into pipe on deceleration and detonate any unburnt fuel leaving engine, causing backfire and high temps.
An overly lean fuel mixture on the engine can make decel backfire worse too.

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My z 650 chop has mukini slide carbs thesticking up between carb just above float bowl level this pie on no3 carb sucks air , i am after a exploded carb diagram to see what it should do


hi there are two possabilites to this one ,it could be a redundant pipe feed to the airbox that you probably dont have now as youve got a chop and well airboxes look awful leave it as it is or it could be your carbs came off a much later bike that had the vacuum fuel tap fitted and this has been left open which should be capped off try sealing it off with a blocked piece of rubber pipe suitable size
if it runs a lot better blocked off theres your answer cheers

Sep 21, 2010 | 1979 kawasaki Z 650

2 Answers

Virago Red Glowing Pipes


you can add fuel stabalizer to prevent carbs from gumming, get the fuel down low in the tank add stabilzer and add fuel so it mixes now run the bike for a few mins to get the carbs lubricated and you good. the noise could be the valve train from cold oil etc hard to say. as for your red pipes
Most likely cause is that you are running lean (not enough fuel/too much air). This could be caused by the wrong size jets, but if you have not changed them, I would look elsewhere. A clogged fuel filter could be to blame. That would be the first place to look. Next I would look for a leak around the joint from the carb to the engine the rubber joint there get brittle over the years and are not air tight anymore . Spray starting fluid...or WD-40 around the joints and listen for a change in engine RPM. This would indicate a leak, You might just have to rebuild the carbs.. good luck

Jan 23, 2010 | 1988 Yamaha XV 535 Virago DX

1 Answer

What coud be making my pipe got red hot


Hi, the pipe getting red at the header is caused by the fuel mixture being to lean or the ignition timing being too retarded. Check the induction side of the engine for air leaks and the carburettor for blockages etc. Check the ignition timing.
Hope that helps Matt...

Nov 23, 2009 | 1986 Suzuki LS 650 Savage

1 Answer

Immediate overheating... with in 1 to 2 minutes of warm up... bad enough to make the header pipe glow red.


It sounds like the fuel mixture is running extremely lean for some reason. Disassemble the carb and clean out the jets. Inspect any rubber parts between the carb and the intake. Make sure the intake manifold doesn't have an air leak.

Oct 07, 2009 | 1998 Honda XR 400R

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