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Tech Information => General Help => Topic started by: xxrick on October 31, 2015, 01:34:31 PM

Title: Mountain Jets
Post by: xxrick on October 31, 2015, 01:34:31 PM

I am going on a old timer run to the mountains and will be running at about 5000-7000 ft.  Does anybody know what jets a 440 invader needs at that altitude.

Title: Re: Mountain Jets
Post by: rminier on October 31, 2015, 03:22:05 PM

 I have kept this JohnDeere manual for 30+ years.
 I will try posting a picture of the carb jetting page at various altitudes and temperatures.
 The Liquifires used an engine from Kawasaki that was nearly identical to the Invaders.
 They used the same style and size Mikuni carbs.

 John Deere did jet the Liquifires slightly different from the Invader, but pretty similar.
 It looks like they recommend dropping the main from 150 to 130 when going from sea level to 4000-8000 feet, and a slight reduction in the Power (econo) jet also.
 This could give you a start...perhaps someone on here has some experience with the Invaders at altitude.
 You might also consider removing one washer from each of the 3 ramps in the drive clutch to help it be able to still let the motor rev up to its normal shift speed....just remember to remove exactly the same washer from each ramp. If your Invader is still stock, it should have 3 washers on each ramp, 2 on one side, and one on the other side of the ramp. So, to keep balanced, you could remove 1 washer from the side that currently has 2.

  Rick

Title: Re: Mountain Jets
Post by: xxrick on November 01, 2015, 12:20:04 AM

Thanks for the help

Title: Re: Mountain Jets
Post by: Interceptor398 on November 01, 2015, 08:28:27 AM

1981 Altitude Specification Chart

Title: Re: Mountain Jets
Post by: rminier on November 04, 2015, 05:18:59 PM

 Great info, Interceptor398! I had never seen a chart like that from Kawasaki.
 Your archives of great Kawi info rivals the "Library of Congress"!! ;D

Title: Re: Mountain Jets
Post by: SySteMAtiC72 on November 07, 2015, 11:39:18 AM

I want to thank Interceptor398 for the chart. It was very helpful because right now because I am assembling two carbs from a box of spare parts that has enough parts to build 4 or 5 carbs. However, after cleaning and inspecting the parts I found that there were various part numbers throughout the lot. Now I can be confident that I am putting the right parts inside the carbs for my altitude range and temperature.

Title: Re: Mountain Jets
Post by: Interceptor398 on November 08, 2015, 08:23:33 AM

Like all the members here, glad to help!!! ;)  It really is a helpful chart.

Title: Re: Mountain Jets
Post by: Checkmarks on November 30, 2015, 04:48:08 PM

Talk about "the right people with the right answers"

Bob, I bow.  You are such a good man.