1979 Kawasaki Invader Help

[mswyka]

OK I got the engine in and I got it to run for a couple of seconds but now nothing, every so often it will sputter but thats after 15 pulls or so. Any ideas? There's fuel in the carbs and it has bright blue spark and good compression. I'm stumped

How does it react when you prime it?

[JLane7071]

It hasn't made a difference, I've replaced the lines, the primer pump and the fuel pump is pumping fuel, I don't get it

[mswyka]

My sense is that if you have primed the engine and it will not start that either the engine is flooded, there is no spark under compression, or the exhaust is restricted. We have had spark coils that spark when the plugs are out, but not when installed. We have also had mouse nests in exhaust pipes that would not allow the engine to pop more than a few times.  Is your spark coil new or old? Have you tried to start with exhaust disconnected?

[JLane7071]

I'm gunna try the exhaust right now

[JLane7071]

OK so I tried the exhaust it seemed to help some it lets out a few more pops but not enough to actually keep running, I guess next step is going to be coil, then if that don't fix it the motors coming back out... Ugh I want to ride so bad...

[JLane7071]

Could it be a timing issue? I noticed the stator and case had marks from the factory and that's how I lined it up, I meant to take a picture before hand but got wrapped up in the moment. :/

[mswyka]

The timing marks are pretty obvious.  I will see if I can take a photo of one of the engines in the garage.

[mswyka]

Here is a photo of the timing mark on the crankcase.  I did not have a stator plate in the garage to photograph.

[mswyka]

It was bothering me that I couldn't find any stators.  Ended up I was looking in the wrong box. Here is the mark on the stator.

So a couple of questions:

1.  Is the gasoline fresh?  What octane?
2.  What plugs are in the engine?  What is the plug gap?
3.  What are the compression measurements?

These sound like pretty basic questions, but we have found that 10 times out of 10 the problem is a basic problem that we have either overlooked because it was so obvious or was masked by another small problem.

[JLane7071]

Compression was 130 psi in both, I was told part of it is fuel being pulled through the pulse line from the pump? Sound right to you guys? And a mix of bad gas and carbs are f***ed, she's getting good fire. I pulled the carbs and everything, gave it time to dry up, put a shot of fresh gas in the ports and she fired right up, no problems.

[mswyka]

There is something peculiarly intoxicating about the fragrant aroma of two stroke drifting in the winter air.  Glad to hear that you have ignition. 

[JLane7071]

Tomorrow she will have the new fuel pump installed and a "fresh" pair of 38mm mikuni carbs, I read the sled should have 36s but mine measure 38?

[JLane7071]

So I found some white sludge in my fuel pump? Any ideas?

[gixxer6]

White sludge =  water