Question about 2003 Honda VT 750 CD Shadow A.C.E. Deluxe

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I just recently changed to a air intake on my bike to a open filter, but now I need to take the carburator off to replace the jet in the carb to allow for more fuel. Is this a complicated task ? I have good mechanical skills just never messed with the carburator on a bike before. Is it pretty much the same concept as the carburator on a car?? thanks for getting back t5o me on this matter!!

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Some similarities, but they are different. You need to remove the bowl on the bottom, and the main jet (If this is what you are changing) will be near the center, usually a hex head (6mm), just don't over tighten the new one, they will break. (The main jet is what your slide needle goes into.)

Posted on Oct 05, 2010


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I have a zx6r f1 1995 ninja. I recently had the downpipes changed on the bike. Now the bike struggles to go past 40mph. I have taken it to a dyno specailist and he as checked the carbs etc and hey are...

Hi, Melvin for openers you need to seek out an experienced professional technician that knows what he's doing, this isn't rocket science and Dyno's are a waste of time, money, and are brutal on your engine and if there is a catastrophic engine failure while on the Dyno guess who pays for a rebuild or a new engine, here's a little hint it won't be the Dyno operator or the company he represents. I have been in the motorcycle business 35 years and worked on thousands of bikes and never once needed a Dyno to help diagnose a performance issue.
If you have changed your 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" your not getting enough fuel.
1. Closed 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. 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, 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.
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How do you adjust the high speed, low speed jets on a 2002 Yamaha Road Star carburator.

The jets are not adjustable. Well - the pilot jet is adjustable a little by turning the air screw, but this is for fine tuning, not for correcting an incorrectly sized jet. If the air screw is screwed out more than about 2.5 turns, the pilot jet is too large and if it is turned in less than 1 turn, your pilot jets are too small.

Adjust the air screw out until you get the highest, smooth idle and then turn back in about 1/4 turn or less.

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1 Answer

Bike fires up very well but will not accellerate

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