[kevins]

I need some help with the carb setup on my D&D ZRT 1000. This is installed in my 98 with stock VM 38 carbs. The instructions have this as the specs:

95-98 ZRT
Main Jet 500 @ 0
490 @ 10
480 @ 20-30
Needle Jet Q5; (480 series)
Needles in fourth clip
Pilot Jets 40

My sled idles fine at this but is very boggy up to 6000 RPM. Between 6-7000 RPM it seems OK but again gets boggy 0ver 7000 and tops out at 7200 RPM. My mileage is also terrible. I went out yesterday and I was lucky to get 60 miles to a tank of fuel. If I move the needle up 2 clips to the 2nd clip it wakes it up and I am able to hit 8000 rpm but I did a few wide open passes and the plugs are a bit lean. I moved the clip to the 3rd clip and it still seems rich at low end but lean in the middle. I have attached a pic of the 3 plugs after cruising around at midrange. The plugs have about 60-70 miles on them.

I've currently running 540 mains and also have a tempaflow. I went with 540s because I figured that would be the -29C jet for the tempaflow. The 500 is for -17C. I am at about 800 foot elevation.

Any suggestions are appreciated.

 

[catmancan]

I need some help with the carb setup on my D&D ZRT 1000. This is installed in my 98 with stock VM 38 carbs. The instructions have this as the specs:

95-98 ZRT
Main Jet 500 @ 0
490 @ 10
480 @ 20-30
Needle Jet Q5; (480 series)
Needles in fourth clip
Pilot Jets 40

My sled idles fine at this but is very boggy up to 6000 RPM. Between 6-7000 RPM it seems OK but again gets boggy 0ver 7000 and tops out at 7200 RPM. My mileage is also terrible. I went out yesterday and I was lucky to get 60 miles to a tank of fuel. If I move the needle up 2 clips to the 2nd clip it wakes it up and I am able to hit 8000 rpm but I did a few wide open passes and the plugs are a bit lean. I moved the clip to the 3rd clip and it still seems rich at low end but lean in the middle. I have attached a pic of the 3 plugs after cruising around at midrange. The plugs have about 60-70 miles on them.

I've currently running 540 mains and also have a tempaflow. I went with 540s because I figured that would be the -29C jet for the tempaflow. The 500 is for -17C. I am at about 800 foot elevation.

Any suggestions are appreciated.[/b]

PM'ed you

 

[green thunder]

very,very ritch....... too much gas= lean read on plugg

 

[kevins]

I should mention that I just installed this topend this past fall and am coming off of a stock 98 800. In the 800 I had 35 pilots, Q0 nozzles and 460 mains.

 

[kevins]

Thanks to BlackMax and CatmanCan. Looks like I am going to try the following to see if that cleans it up.

Main Jet 480
Needle Jet Q5; (480 series)
Needles in 3rd clip
Pilot Jets 35

I'm also going to disconnect the tempaflow for a bit.

 

[jmg]

Are your carbs bored out to 39.5 ??
If not, thats your problem. your jetted way to rich. for the stock 38mm carbs.