HELP 1986 Bullet 19V Motor Height Setup

[logan1297]

My Bullet is extremely slow out of the hole with a 78 200 Evinrude with a jackplate turning a 24 p Turbo prop, I feel that my motor could be mounted too low. Where should my prop shaft or cavitation plate in relation to the pad on my boat?

 

[logan1297]

I should also add that below about 40 mph it wants to porpoise really bad. I feel that these are both possibly caused by the motor height.

 

[racerone]

Do a compression test on it first.----How long have you owned it.

 

[logan1297]

I have owned it for a few months now and just rebuilt the lower unit. I have not done a compression test but there has been a recent one done as the numbers are still written on the heads all within 110-115

 

[racerone]

They run surprisingly well on 5 of 6 cylinders.----Have you checked for proper spark on all 6 leads?.----Proper spark will jump a gap of 7/16" or more.---Test compression today.----Run motor on a dyno to evaluate power output ?

 

[logan1297]

They run surprisingly well on 5 of 6 cylinders.----Have you checked for proper spark on all 6 leads?.----Proper spark will jump a gap of 7/16" or more.---Test compression today.----Run motor on a dyno to evaluate power output ?

Can I check the spark just like on a car by pulling them out and setting them on the block? Also, I don't have access to a dyno to do exact power output.

 

[racerone]

Using the sparkplugs is not a valid test.----The 7/16" gap tests maximum ignition output and the health of the system !

 

[logan1297]

Using the sparkplugs is not a valid test.----The 7/16" gap tests maximum ignition output and the health of the system !

Would the spark plugs still be an issue if I get through the porpoise and smooth out at about 40 mph running 3800 rpms trimmed all the way down?

 

[Faztbullet]

Even thought the cowling says 200hp it was powerhead rated...it is equal to a GT150. What size jackplate and current engine height??

 

[logan1297]

Even thought the cowling says 200hp it was powerhead rated...it is equal to a GT150. What size jackplate and current engine height??

The prop shaft is about 6 1/2” below the pad. It is a 6 inch manual jackplate.

 

[logan1297]

 

[logan1297]

Im trying to add a picture but I cant get it to upload

 

[logan1297]

 

[Faztbullet]

(1) Take the tuck out of jackplate as its killing you positive trim. (2) Is that a Shooter or Stiletto 4 blade? (3) Need to come up about a inch but need water pressure gauge to go higher.

 

[racerone]

Do you move the tilt pin to the front hole ?

 

[logan1297]

(1) Take the tuck out of jackplate as its killing you positive trim. (2) Is that a Shooter or Stiletto 4 blade? (3) Need to come up about a inch but need water pressure gauge to go higher.

It is a Turbo prop 24 pitch. Should the cavitation plate be even with the pad?

 

[logan1297]

Do you move the tilt pin to the front hole ?

i have not moved the pin at all.

 

[racerone]

Move The tilt pin all the way forward.----Test run the boat.