I have a 1996 200 Johnson venom have replaced timerbase,stator,powerpack,new fuel pump,rebuilt carbs and changed reed valve. Compression is 100-105 on all cylinders. My problem is motor will run good and all of a sudden it will run bad missing no power. My mechanic has found that it is something to do with number 6 but is at a loss if you can help thanks
Check all connections...Did he use OEM parts or CDI? Model number of motor? What was the original problem you where chasing?
Age and treachery will always overcome youth and skill !!
Model is J200stledm problem was no spark at all and yes he used cod powerpack and timerbase
Sorry that is cdi not cod
Move the coil and plug wire from #4 to #6 and see if the problem stays with the cylinder or follows the coil. If you aren't running Champion QL78YC's gaped at .030" change what ever is in there to those.
Thank you I will do that and it has ngk plugs in could this be the problem
From the service manual, use of any non suppression plugs will cause ignition problems. the NGK's are a resistor not a noise suppression plug.
Ok I have replaced everything electrical on this motor including the shift interuot switch all new fuel lines filters and pump new champion plugs gaped at .030 new plug wires cleaned all carbs and new gaskets twice now with no change got spark and fuel at every cylinder. Stella number 6 will not burn the fuel I have moved coiles moved carbs also with no results problem stays on number 6 has any one ever had anything like this any help is greatly appreciated and thanks
Pull the hose off the pulse limiter at the VRO pump and at the fitting it self, see if fuel runs out of the hose. Also with the pulse hose off the pump, start the motor and see if #6 now starts to fire.
What will need to be changed if gas comes out the hose and with it off if 6 starts working what is bad
I am sorry I am at work today and can’t try this till tonight
Would/could be an indication of a leaking fuel pump diaphragm. and fuel is being sucked into #6 cylinder and flooding it out.
Champioman thank you very very much for all the help found the problem it was the lower crankshaft seal agen thanks for all the help
So my 98 200 Johnson is fairly similar to what keith78 was experiencing.
I have rebuilt my #6 carb, it was very clean inside. Cleaned all passage ways. Still no fuel to #6.
I tried squirting a mix of fuel into carb 6 while at idle and no change to the engine.
I even swapped #5 carb with #6 to eliminate it being a carb problem.
When it is idling and I put a dollar bill over the carb I do get the twap twap sound.
It is like fuel is not being sucked thru the manifold to the chamber.
Keith78, How did you finally figure out it was the lower crankshaft seal?
Was it hard to change?
98 Triton TR21, 200 Johnson Venom
2011 RAM 1500 Loramie Longhorn
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