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Honda cb500 twin carb adjustment running 2 rich

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  • Contributor
  • 41 Answers

Float level, or old brass float corroded out. Shake float and see if it has gas in it.

Posted on Jul 04, 2013

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

ginocussen
  • 216 Answers

SOURCE: honda vt 750 backfires

First check all spark plugs(NGK are a good brand) / HT leads / plug caps. Secondly, Check that the valves are properly gapped - if they are tight they will leak the cylinder gases past the valve(s) and this will cause a misfire. A losse or leaking manifold will also. if you have aftermarket pipes then it may need to be rejetted to suit. If you got them at a dealer they will know the right jets. I couldnt find an english manual but here is a german on that may help with diagrams etc... Good luck. Rate if good.
Thanks

http://www.carlsalter.com/download.asp?fileid=072111110100097095086084055053048095067045067050086095039057055095040103101114109097110041046112100102

Posted on Mar 26, 2009

  • 1 Answer

SOURCE: 1983 honda GL1100I, New spark plugs, good

When I recently ordered parts from Saber Cycle, they included a piece of information that pertained to my motorcycle, which is also a 1983 Honda Goldwing GL1100 Interstate. Here is what it says, I hope this helps:

Air Cut-Off Valve

The air cut-off valve is an extremely important part of the fuel/air intake system that is frequently missed even my competent mechanics, most of whom are not even aware of its existence or how it functions.

Every GL1000 has one, located in the air intake tube, between the air cleaner box and the manifold. Every GL1100 has four, located in the top air intake passage of each carburetor, and every GL1200 has one located in the plenum box below the air cleaner box similar to the GL1000.

These valves are "air blockers", along with the carburetor o-rings, serving to restrict air flow and increase the fuel/air mixture ratio when the carb slides are in the lower RPM range, up to closed so that the machine will start and idle smoothly with virtually no choking and accelerate rapidly, with no stumble or hesitation.

When typical starting requires heavy and prolonged choking to keep the bike running, when stalling and hesitation occurs even while "warmed up" and when backfiring pops while the throttle is shut off while cruising, most people will start fooling with the air screws to try to overcome the problem, only making it worse along with reducing their gas mileage.

Running with dysfunctional air cut-off valves can causes severe engine damage or failure. When the valves are dysfunctional, the engine pulls nearly total air in the low RPM range through the carbs and on to the combustion chamber. The fuel/air ratio is extremely poor with pre-ignition long before the normal 38 to 40 degree firing point, generating an enormous amount of heat, with no power, which is trapped a longer period of time in the cylinder before the exhaust valve opens.

This heat goes mostly up through the cylinder head, gradually incinerating the head gaskets and allowing engine coolant (anti-freeze) to seep into the engine. You can easily spot when you are in trouble by a puff of bluish-white or white smoke on first starting the engine. Don't leave it alone. Change head gaskets immediately or you could take out your bottom end bearings, ruining the engine.

For those of you installing new exhaust systems, you will discolor your headpipes, either blue (lean state) or gold (rich state). You can destain your pipes using "blueaway" or "blue-off" but be careful not to rub the chrome, just dab gently.k These compounds are usually purchased at a Harley dealer or Harley oriented aftermarket shop.

Honda genuine pipes, like many Yamaha pipes, have a double wall for a portion of the headpipe which masks this discoloration-but also masks a bad state of tune. Even if your pipes are original and still in good shape, don't think that you are OK if the bike has any or all of the dysfunctional air cut-off valve running and performance characteristics.

If your 1975 to 1987 Gold Wing is not getting 50-58 miles per gallon (20-23 KM/Liter), you have one of the most obvious signs of trouble. It is likely your air screws have been backed out to try overcome the effects of the poor running, stumbling, starting and stalling and quitting.

Resynchronize all four carbs to the #3 carb vacuum level using mercury carb sticks or vacuum dial gauges. Stay with strict use of the setting levels in either the Honda, Clymer or Haynes manuals. Do not attempt to tune any other way! Guessing will not work and can cause considerable engine damage!!!

Posted on Sep 26, 2009

ollie reece
  • 1167 Answers

SOURCE: Carb is running rich. How can I adjust it?

on the mixture screw in picture below buddy b4b6b13.jpg

Posted on Nov 03, 2009

SOURCE: how do i adjust my carb for my honda crf 70 its either

To know if it is too rich or too lean or if its ok , you will have to remove the spark plug i.e. after a short run.
If the spark plug is blackish sooty thn its rich, if its totally whitish thn its lean, if is brownish, its ok.

To adjust this you will need to set the air-mixture screw. Tighten it all the way in slowly taking care not to overt tighten it as you may damage the tip of the screw, thn unscrew it 2 &h alf to 3 turns outwards, start your bike's engine and monitor, you may thn go either way alittle to suit the idling.
Best would be to replace the saprk plug.
Hope this helps!

Posted on Nov 21, 2009

SOURCE: honda vlx 600 seems to be running rich,took out a

There are two set screws on the throat of the intake. One is the high side and the other is the low side. You need to turn the high side about 1/4 turn clockwise. If it is still rich, do it again until it is nominal.

Posted on Apr 07, 2010

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I have a 19993 cb 750 nighthawk. I have cleaned the carbs and replaced the floats, but i have 2 cyls still running rich. Could it be from the , what honda calls the starter valve(choke)?


Hi, Paul it is possible or your carbs need to be sync for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Honda, despair not, for a mere zero $ you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
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Sounds like it is running far too rich. Verify proper spark, verify that the float bowl is not overflowing (replace the float and/or the needle & seat if necessary), and adjust the idle mixture screw clockwise to make the idle mixture more lean. (Many tutorials on carburetor adjustment on Youtube.)

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Where is the battery on a cb500 twin 98


Lift the seat. and buy a manual. then try bump starting the bike, when it is running let it sit for a while. If the bike has been sitting with a flat battery for more than about 1 month you will more than likely need a new battery. Try Wemoto for parts and batteries.

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Where is the fuel mixture screw for 30mm JINKE Carburetor on a Atomik 250cc motrobike?


what kind of carb is it? some will be on the side of the main chamber, although on some others that are CV (constant Vaccum) carbs like a ZX6R they are underneath in the gap of the float bowl, although a Honda CB500 has it right between both carbs quite high up and you need a very trick screwdriver for that!

if you are unsure take each screw out that you think it may be, and if its got a needle type end then thats ya mixture screw.

put it all the way in again and turn it 3 full turns out as a guideline, may need more or less

get a Gunson Colourtune to get it completely accurate

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YOU dont need a diagram for twin carbys as put them on the manifold back off all throttle linkage and adjustment screws make sure thay are all down, and turn both screws down till they touch, now back off the jets nuts under the carbys and then undo them 2 turns only[thats the ones the choke move up and down] now HB on out of gear a little choke start engine adjust 2 screws 1 more turn each and choke in
make sure you have very thin oil in pistons, then when running adjust jets 1flat at a time when it runs smooth lock up the linkage and adjust screws till idle at 600 RPM.

Aug 15, 2012 | Austin-Healey SPRITE Cars & Trucks

1 Answer

How do i adjust my carb for my honda crf 70 its either


To know if it is too rich or too lean or if its ok , you will have to remove the spark plug i.e. after a short run.
If the spark plug is blackish sooty thn its rich, if its totally whitish thn its lean, if is brownish, its ok.

To adjust this you will need to set the air-mixture screw. Tighten it all the way in slowly taking care not to overt tighten it as you may damage the tip of the screw, thn unscrew it 2 &h alf to 3 turns outwards, start your bike's engine and monitor, you may thn go either way alittle to suit the idling.
Best would be to replace the saprk plug.
Hope this helps!

Nov 21, 2009 | Honda CRF 150 F Motorcycles

1 Answer

Throutle cables conections


to adjust the mixture will be a screw on the carb fiddle with this screw till it runs perfect this is to adjust the richeness and leaneness7cca8b2.jpg

Sep 30, 2009 | 2005 Honda CRF 250 R

1 Answer

1999 CB500 starting problem


How about the carbs? Jets could be plugged. May want to put some sea foam in it first and see if it needs a good cleaning with that.
I would put a fuel inline filter on it and put fresh 91 octane gas in it.
My savage had a clogged muffler once..

Sep 22, 2009 | 1997 Honda CB 500 S

1 Answer

Engine has no power


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