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Main jet size delorto phbh 30 - 2011 Moto Guzzi Nevada 750 Anniversario

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Main jet size


Bigger jet is not the problem. More fuel would be put in and you said that it runs well at the top end. So it is not a fuel shortage issue.

May 28, 2015 | 2005 Yamaha DT 125 RE

1 Answer

I have a 1980 rm125 and I have a 140 main jet on it is that the right jet or if not please tell me the right stock jetting.


You should really have the workshop manual if you are working on the carb. Not only will this tell you the correct main jet size, you will also get the pilot jet size, mixture screw, and jet needle positions. All of these should be checked if you're taking apart the carb yea?

Mar 10, 2015 | Motorcycles

1 Answer

Carburator jetting


if the carb is fairly old the vibration makes the needle bang aroun the hole of the jet, thus making it larger and richer over time.
Ill try for that height about 3-4 numbers leaner... but be carefull!, if youre rich (gasoline term!)and go higher (altitude i.e. to a mountain) the only problem is that the engine will waste fuel, and a little black smoke... BUT if you are lean (or close to lean-of-peak) and go lower (altitude i.e. close to the sea) you can go dangerously lean and can make a hole in one piston or destroy the engine due to detonation and preignition.
just go 2 numbers, and if going to the beach, re jet the carb.

Aug 08, 2014 | 1969 Volkswagen Beetle Carburetor Rebuild...

1 Answer

Carby needs tuning


Rejetting is a good idea.
Finding the right jet is a process of elimitnation.

Feb 18, 2014 | 1999 Aprilia RS 125 Extrema

1 Answer

Factory Jet Sizes


Front cylinder carburetor:

·
112.5 Main Jet

·
17.5 Pilot Jet

·
(1) 0.020" thick shim washer under the needle

·
PMS setting apparently varies from bike to bike... but it should be 2.5 turns

Rear cylinder carburetor:

·
110 Main Jet

·
17.5 Pilot Jet

·
(1) 0.020" thick shim washer under the needle

·
PMS setting apparently varies from bike to bike... but it should be 2.5 turns

May 23, 2013 | 2000 Yamaha V Star 1100 Classic

1 Answer

Fuel line routing


Instructions

1

Fine tune your motorcycle before rejetting your carburetor. If it's still running too lean, you can replace the pilot jet as a first step
2

Remove the bowl at the base of the carburetor by unscrewing the screws holding it in place. Unscrew the pilot jet inside, but be careful not to strip it. The jet size will be on top.


5 Year/ unlimited mile warranty No up front core charge
www.Cylinder-Heads.com
3

Use a screwdriver to remove the main jet from the brass jet needle holder, which is also called the emulsion tube.
4

Put in a pilot jet that is one size larger. Replacing it with a jet two sizes larger will make your mixture too rich.
5

Tune the slow/idle settings before replacing the main jet. Replace the main jet with one size larger. The sizes are in increments of 5.
6

Put the bowl back on, and align the accelerator pump shaft and rubber boot.
7

Reinstall the carburetor on the motorcycle and retune it to finish the rejet procedure.

Jan 11, 2013 | 1998 Honda VT 600 C Shadow

1 Answer

What is the size of main jet of YZ125?


  • Main Jet: 410
  • Main Air Jet: 2.5
  • Jet Needle: 6BFY43-74
  • Needle Jet: S-1
  • Pilot Air Jet 1: #40
  • Pilot Outlet: 0.7
  • Pilot Jet: 40

Jun 05, 2011 | 2003 Yamaha YZ 125

1 Answer

Main jet sizes


The sizes are stamped on the Jet it self. For the Honda Shadow it is a 185. Not sure for the steed.

Jan 12, 2009 | 1990 Honda VT 600 C Shadow

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