Re-jetting - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 5 (permalink) Old 05-26-2010, 10:08 AM Thread Starter
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Re-jetting

This is a segue of a previous thread under Engine-Exhaust-Cooling started by vulcanpappy called 'V&H Cruzers' that has evolved into a conversation about re-jetting.

Is there a rule-of-thumb for what jets should be used at a given altitude? In other words, what jets would be used at:
Sea level
500' above SL
1000' above SL
etc...

What size jets are factory installed?
What other considerations determine what jets should be used?
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post #2 of 5 (permalink) Old 05-26-2010, 11:17 AM
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In most cases rejetting is not needed when installing V&H exhaust but you will need to turn the pilot screws out 3.5 turns.

If rejetting is needed then I suggest using the combination I gave Jerry and others, it wil work @ any altitude.

#40 Pilots
#135 Mains
2 Turns out on the pilot screws

If you do an earshave then that's a different ball game.


85 VN700 "Old Yella"

REBUILT ENGINE
CUSTOM PAINT
VANCE & HINES CRUZERS
EAR SHAVED AND RE-JETTED W/K&N'S
DUNLOP ELITE K591 FRONT & REAR
VOLTMETER
SYNTHETIC BRAKE FLUID
SYNTHETIC OIL & GEAR LUBE
PLEXISTAR 2 WINDSHIELD
SPLINES LUBED
ACCT'S GREASED W/TOC SPRINGS
COASTERD
LEATHER SADDLE BAGS
LEATHER TOOL AND ROLL BAG
PICKUP COILS GAPPED AT .018"
NGK CAP, WIRES, IRIDUMS
BARNETT FRICTION PLATES & SPRINGS
CUSTOM GRIPS, MIRRORS, LEVERS
ORIGINAL STATOR & R/R 14.5v
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post #3 of 5 (permalink) Old 05-26-2010, 11:20 AM Thread Starter
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Oops...my bad.
When doing an earshave, is there a rule-of-thumb for what jets should be used at a given altitude?
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post #4 of 5 (permalink) Old 05-26-2010, 11:39 AM
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Quote:
Originally Posted by VoIP Doc View Post
Oops...my bad.
When doing an earshave, is there a rule-of-thumb for what jets should be used at a given altitude?
The basic rule of thumb is more fuel @ sea level and less @ high altitude.

As far as I know there is no chart to tell you what combination to use. For me I used 1000' as a baseline since I know what combination works. The jet combination also depends on the type of intake filters and if your exhaust is open or baffled.

Since I have done sooooo many different jet combinations around the world for different conditions and setup's I only need to know three things.

1) Elevation
2) Type of filters
3) Type of exhaust


85 VN700 "Old Yella"

REBUILT ENGINE
CUSTOM PAINT
VANCE & HINES CRUZERS
EAR SHAVED AND RE-JETTED W/K&N'S
DUNLOP ELITE K591 FRONT & REAR
VOLTMETER
SYNTHETIC BRAKE FLUID
SYNTHETIC OIL & GEAR LUBE
PLEXISTAR 2 WINDSHIELD
SPLINES LUBED
ACCT'S GREASED W/TOC SPRINGS
COASTERD
LEATHER SADDLE BAGS
LEATHER TOOL AND ROLL BAG
PICKUP COILS GAPPED AT .018"
NGK CAP, WIRES, IRIDUMS
BARNETT FRICTION PLATES & SPRINGS
CUSTOM GRIPS, MIRRORS, LEVERS
ORIGINAL STATOR & R/R 14.5v
DEKA MF AGM ETX15L

Best Auto/Moto Insurance | Motorcycle Protection Today | FREE Trade-In Quote
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post #5 of 5 (permalink) Old 05-26-2010, 01:54 PM
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1. 7000 above MSL
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