1975 Kawasaki Triple

[Phenix_Rider]

How important is fuel pressure to these things? It seems like the rightmost cylinder is being starved- the line only fills up when we pinch off the two left lines. The petcock definitely needs rebuilt or replaced. Right side runs intermittently, and the center cylinder still seems weak. The left is doing all the work, but we can get the other two going stronger by lifting their individual throttle cables. Makes me wonder if something is wrong with the throttle cable- like the amount of adjustment needed to even them up is out of the range at the top of the carb. Or they're not getting enough fuel to keep up. All the air screws are set the same- 1 full turn out. (Book says 1 1/4, so it should be slightly rich) And all the piston slides are set the same on the adjuster beside the throttle cable input.

['73 H1 Triple]

Originally Posted by Phenix_Rider

How important is fuel pressure to these things? It seems like the rightmost cylinder is being starved- the line only fills up when we pinch off the two left lines. The petcock definitely needs rebuilt or replaced. Right side runs intermittently, and the center cylinder still seems weak. The left is doing all the work, but we can get the other two going stronger by lifting their individual throttle cables. Makes me wonder if something is wrong with the throttle cable- like the amount of adjustment needed to even them up is out of the range at the top of the carb. Or they're not getting enough fuel to keep up. All the air screws are set the same- 1 full turn out. (Book says 1 1/4, so it should be slightly rich) And all the piston slides are set the same on the adjuster beside the throttle cable input.

They are gravity fed so not much "pressure". If your dad not worried about "museum correct", I would replace the vacuum petcock with this one.
http://cgi.ebay.com/ebaymotors/Kawas...1662QQtcZphoto

It's $58 for the complete unit. The rebuild kit for them is $48 and that does NOT include the vacuum diaphram which costs over $60.
http://cgi.ebay.com/ebaymotors/Kawas...2987QQtcZphoto

I have one of those I'll be using on one of my triples. It has "On, off & reserve".

The carb adjustment may be off due to stretched cable or maybe just being out of whack. Turn in the adjustments on the carb tops and then take out as much slack as possible with the throttle adjustment. Then fine tune to get equal setting with the carb top adjustments.

If you still have the original fuel lines, that may be a problem too.

[BobTheBiker]

yup, 2 strokes are pickier about the plugs than women are about jewlery.

[was92v]

I know it is a hard thing to do, but now that you know it will run, stop trying and start at the top (tank) and work through each system, top to bottom, front to back. There is not a huge amount of things to go through. Make sure everything works the way it is is supposed to and is adjusted correctly. When the Battery, ignition timing, coils, plugs, oil pump, carbs, cables, sync, clutch and chain are all cleaned and adjusted to spec, Kick it. You will likely be rewarded, on about the 2nd or 3rd kick with smoky pleasure of the legal type. Enjoy.

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