Kawi2strokes.com Forum

Pop a Head off, and have a look, 4 bolts!

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"One day, your life will flash before your eyes. Make sure it's worth watching." : anon.

I suggest getting a 4 year degree in rocket science

Checked the needles today and they are the same 5DJ19 in all carbs. Clips were at the 3rd position (spec says 4th) but I left them there. New float valve assy in two carbs and they don't drop gas anymore.

Carbs are synced as far as throttles are at the bottom (no idle) and they have zero play in the throttle wires.

Did another compression test on all cylinders after warming the engine. All showed at least 150 psi, but a bit different readings.

The center have spark and does run when over a certain RPM.

Have yet to take the center cylinder head off and check the piston.

I'm starting to run out of ideas. Bad ignition? Leaks in the engine still possible?

When I worked in the auto repair trade, we had a car that would not run. When we sprayed starter fluid in the intake, it would run. So we looked for a fuel system problem. Turns out the engine had an ignition problem but the starter fluid would, for the lack of a better term, diesel and would make it run.

The compression test says that the piston is OK.

You can swap white wires going to the CDI units between the center and another cylinder, and swap red wires going out of the CDI units to the coils of the same two cylinders. Then if the cylinder that doesn't run properly moves, you know a CDI unit is the problem.

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If it surges, that's normal, upshift.

I haven't gone back thru the prior posts on this thread but I have a suggestion based on your recent comment.
Check the resistance of each pickup... should be 160-180 ohms. Anything less is a problem.
Check pickup air gap.
IF all that checks out swap the ignition modules.

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Answers are here: http://kawatriple.com/

Thanks all will do the suggested tests!

As I said in an earlier post a new wiring loom was sent with the bike. Could the current one have gremlins in it?

Mraxl's idea is a good one for sure. Since pickups' signals get bigger with increasing RPM, one that is failing and not making much signal could easily still work at high RPM.

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If it surges, that's normal, upshift.

If you have resistor type plug caps,remove them & fit non-resistor caps.
Do not use resistor type spark plugs.
Fit a new set of spark plugs ( Bosch W2AS plugs are a very good plug for triples)
Have you set the ignition timing the correct way using a dial gauge & timing light at
or over 4000rpm? ( as it states in the manual on each cylinder).
Check the resistance values of the 2 ignition charge coils in the stator ( low & high speed coils).
Check all earth (ground) connections.
Unplug Black-White wire from small cdi box start engine,does it run better?
Do not hold the B/W wire their is about 300 volts on it when the engine is running.
To stop engine short B/W to earth ( ground).

This may have been covered... however... if that cylinder has bad seals or a crankcase leak somehow, it won't run down low but as pumping improves with speed it will start to run. Single cylinder 2 strokes won't start with dead crank seals, a triple will.

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1974 Kawasaki H2B 750, 1981 Yamaha XV750 Cafe, 1986 Kawasaki KDX200, 2003 Honda XR100, 2004 SDG140. 2006 Ninja 500R Turbo intercooled fuel injected.