Question about 2004 Honda Shadow VLX
How do I adjust my 2003 honda vlx motorcycle carb so it won't die when driven past 60 miles an hour. @
Hi, Mintonrobin if you have changed your engine size, fuel delivery system, air filter size or flow rate, mufflers or exhaust system or a significant change in altitude your carburetors need re-tuning and if your fuel system (gas tank, filters, fuel valve, and carburetor) is contaminated with ethanol sludge, varnish, rust, dirt, water etc. or your bike has been sitting for months or years without running these components must be "PROPERLY" cleaned and reassembled "CORRECTLY" before any adjustments can be made. Tuning your carburetor is fairly simple once you understand the basic principals. You engine is a simple airbox sucking air in and blowing it out, it is finely tuned at the factory for maximum performance once you upset that delicate balance by changing air filters, camshafts or exhaust systems your performance may go down the and the engine may run poorly, you need to compensate the air-fuel mixture in the carburetor in order for the engine to run smoothly and at peak performance. If you are running multi carburetors you need to sync them first and make sure your air cleaner element is clean and dry for paper elements or lightly oiled for foam and meshed elements and properly installed. Here is how and where you compensate trouble: "TIP" if your engine "BOGS" you're not getting enough fuel.
1. Close to 1/8 throttle is managed by the air screw and pilot/slow jet.
2. 1/8 to 1/4 throttle is managed by the air-screw, pilot/slow jet, and throttle slide.
3. 1/4 to 1/2 throttle is managed by the throttle slide and jet needle.
4. 1/2 to 3/4 throttle is managed by the jet needle, needle jet, main jet, and air jet.
5. 3/4 to wide open throttle is managed by the main jet and air jet.
6. A wide open throttle is managed by the main jet.
If you are running lean, spark plug electrode color is white, engine runs hot and feels like it is starving for fuel you need to go up on the jet size or move the c-clip down one notch. If you are running rich, spark plug color is black or dark gray, the engine runs cool, and bogs down when accelerating you need to go down on jet size or move the c-clip up one notch. When your carburetor is properly tuned for maximum performance your spark plug electrode will be a light tan color like coffee with cream. If you prefer fuel economy over performance you can go down on main jet sizes until a satisfactory level of lower performance is acceptable versus MPH, your spark plug color will be whiter and your engine will run warmer. These tuning adjustments will only make improvements if your intake and exhaust system have no air leaks or sealing issues and the entire electrical system is in proper working order and you have no mechanical issues.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
Carburator Theory and Tuning
Performance Tuning Single Carb Honda Shadow VLX600
Honda VT600C Shadow VLX Service Manual
Honda VT600C Owner Manual
Posted on Feb 14, 2018
A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Hi! I presume you have a Kei Shein carburettor set up? if so there really isnt a float height as such, if you are experiencing flooding or fuel spewing out of the rear aperture it is more likely the float needle/valve is either worn or has foreign matter stopping it from shutting out the fuel supply.
When you take the float bowl off and look at the float you'll see at the end under a tang a tiny spring around the tang which is attached to the float needle careful removal will reveal all for servicing.
O.K. penny dropped? do you mean Needle Jet? if so try middle to start and check plug colour after good run, remember raising richens the mixture lowering weakens. Trial & error I'm afraid as mileage, wear and fuel quality all determine final result?
Posted on Dec 06, 2008
The seal under the dirt seal on the fork was leaking when I picked the bike up from the owner. left the fork oil under the dirt seal kept bouncing the forks up and down for 4 days the seal got soft from the fork oil so I pulled the dirt seal up then cleaned the fork oil under it with a rag then checked it for leaks then pushed dirt seal back down in the groove and its not leaking now 200 miles and still dry.
Posted on Jun 07, 2009
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
Tips for a great answer:
Aug 19, 2017 | 2004 Honda Shadow VLX Deluxe
May 26, 2014 | 2002 Honda VT 600 CD Shadow
Apr 10, 2013 | 2006 Honda Shadow VLX
Mar 17, 2013 | 2004 Honda Shadow VLX Deluxe
Jun 06, 2012 | 1997 Honda VT 600 C Shadow
Apr 18, 2012 | 2003 Honda VT 600 CD Shadow
Mar 27, 2012 | Honda Shadow VLX Motorcycles
Aug 07, 2011 | 2005 Honda Shadow VLX
Oct 21, 2017 | 2005 Honda Shadow VLX
Mar 28, 2011 | 2003 Honda VT 600 CD Shadow
158 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: