1990 200 omc looper

[don wenger]

just bought a 200 looper VE200SLESE ,starts good,but takes a long time to get on plane,once on plane seens to run good,but top speed is only 50 to 55 mph on a 20'tunnel hull SHADOW 200VT---I was running a 150GT johnson at 72 mph same prop,reg gas 50/1 Whats wrong?-------thank you,Don

 

[ezeke]

Re: 1990 200 omc looper

Sounds like you are dropping a cylinder or two. Run your compression and spark tests.

 

[don wenger]

Re: 1990 200 omc looper

checked compression,cold all plugs out 120-125-125-left side120-120-120-right side-motor has not:redface: been run in about two years,maybe carbs need cleaned

 

[ezeke]

Re: 1990 200 omc looper

The compression sounds good. The spark should jump 7/16 gap sharp and blue snap with all plugs removed. You can test it with a CDI Electronics multiple tester like the ones sold here at iboats or just do them one at a time with the rest of the plugs out but grounded to the block.

http://www.iboats.com/CDI_Spark_Gap...23229973--**********.702806455--view_id.38089

The KD 2756 Calibration Ignition Tester is a good one for testing one hole at a time with the other plugs removed.

 

[d.boat]

Re: 1990 200 omc looper

just bought a 200 looper VE200SLESE ,starts good,but takes a long time to get on plane,once on plane seens to run good,but top speed is only 50 to 55 mph on a 20'tunnel hull SHADOW 200VT---I was running a 150GT johnson at 72 mph same prop,reg gas 50/1 Whats wrong?-------thank you,Don

Do you know if this is a change from previous performance?

What are your WOT rpms?

 

[don wenger]

Re: 1990 200 omc looper

no,I do not know,WOT @ 5600 rpm

 

[Dhadley]

Re: 1990 200 omc looper

Are all the linkages going to wot? What's the timing set at? Are you sure it's hitting on all 6 at wot?

Granted, you'll have some weight differences but that should only affect handling. Going from a crossflow (1940's technology) to a looper (90's technology) should be like going from a Corvair to a Corvette. You should be spinning the same prop a bunch more than with the crossflow.

 

[don wenger]

Re: 1990 200 omc looper

cleaned and rebuild carbs,new water pump and impeller,runs a whole lot better,since then I have added seafoam and rasied motor to 2 3/4" below pad but have not put it back in the water yet.

 

[alwood0422]

Re: 1990 200 omc looper

I have an 87 200 OMC, on my 20' Grady White I am lucky to get 55 MPH down wind with stern seas. Mine is running top notch, although I am probably heavier than you. I used the Sea Foam to decarb and gained about 5 PSI in each cylinder and cleaned out the carb. Make sure you have new plugs and the carb is tuned and clean.