Night Rider Liquifire

[JDT]

Mark brings up a very good idea that warrents looking into.

I ran into this once years back. And it caused similar issues also.

[SnowCrossMark]

[img]

[/img]This is from a post I saved about three years ago.
It shows tuning with pipes and with porting and pipes..
My input is that the higher performance the tuning the more critical that the engine's compression be at the top.

[liquifireguy]

I think we may be getting closer. One problem is it may be starving for fuel. When I put lines on, the 1/4 inch line looked too big for the line into the fuel tank. I was afraid that the line would swell or soften up and lose the check valve, so I put 1 size smaller line on so that it would fit tighter. After reading that it may be starving for fuel, I pulled the line out and put 1/4 inch line on, which is looser but I think it will work. The sled does have 38mm carbs instead of the powerjet carbs. I have the original powerjets that came on it and it looks like they have never been used.

I tried it a couple of times-- once at about 15 degrees in the afternoon and once at about 3 below in the evening. At about 15 degrees, it will run about 20 mph top and bog. At 3 below, it will run about 30 mph and do the same bog. Both of these were on the snow packed road in front of our house. I checked the plugs after the 15 degree run and they looked about the right color, but it was too cold to stick around and check them in the evening.

I think that, when the previous owner replaced the stator, he put the old stator in the box that the new one came in, which is a Kawasaki box and has the part number. I should be able to tell from this which stator I have on it. Danzig, so, if I am thinking correctly, your stator is rotated about 1mm counterclockwise from the mark? Is there any need to time with a timing light or does this do it?

Mark, thanks a bunch for finding those charts. That will help a lot with the initial setup. I can go from there with the fine tuning. Maybe it would be good if Matt could post the chart in the technical information for future use??

Could my fuel pump be a problem? It has a newer round pump-- one of the shorter ones than the Deeres had as stock. I see that there is a high volume pump available that pumps 70 litres/hour. The pump that is on it looks fine, but could it be starving it for fuel?

Thanks, Jeff

[Danzig]

I advanced timing by taking the mark on the stator clockwise or down past the mark on the case, about the thickness of the mark is what I advanced it.

[Danzig]

Could it be that the stator was not put on correctly and marks are way off ?

I would check compression so you know. Get the powerjets back on it properly jetted per the latest PIP. Airbox included, run NGK BR9ES plugs, I would magic marker the sheeves to check shift out, make sure choke plungers are seating and not hanging up when the dash is closed .

[liquifireguy]

Paul, with it ported and the exhaust, wouldn't it be too lean with the stock carburetion? One of the first things I did was a compression test and it was 120+ on both sides. Before I pull the flywheel, I am going to try a timing light. Any timing problems or incorrect stator should show up I hope. Thanks, Jeff

[Danzig]