no power on take off 90 GT 150

Hay i am looking for some help on my 90 GT 150 the motor starts ok and runs good but when i jump on it ,it will take about 3-4 hundred yards to pass 3000 rpms then it takes off like a raped ape,i can normally run the 5600ar lake about 3 or 4 times at 60mph and use about 12 gal of fuel now its one time run and i am on e i have build this motor 2 season ago and i can do most anything but when it comes to testing things i am lost, can someone give me some ideas and how and what to test.
Thanks
larry

I would check and make sure the initial timing is right, and that you are getting full advance when you give it full throttle.

Sounds to me like you need to get the prop worked on to free it up some for the hole shot....

I was reading some of the other questions and i see people talking about the timing basic and bad coils could that play a role in this, and how can i check then?
I know the prop is fine just had that retuned last fall and never had any problem till i fired it up this spring after being stored.
thanks
larry

Check your center carb and see if the roller still has its clear plastic roller on it, and that it is touching the small embossed mark on the cam follower. Then check to make sure the throtle plates are opening fully when you advance the throttle. I'll bet the clear plastic roller has deteriorated.

If you don't use it I would suggest using Seafoam to remove the Carbon Buildups as well as Gum in Carbs and Cylinders. I had the same type problems on my 79 140hp Rude and replaced all the Electronics and still couldn't get it fixed. Shock treated it with Seafoam and now it runs like New. May not fix Yours but it can't hurt trying since It all started after sitting the winter. http://www.bassboatcentral.com/smileys/smile.gif http://www.bassboatcentral.com/smileys/roll.gif http://www.bassboatcentral.com/smileys/USA1.gif

yes the the cover is still there i had it replaced last year and it is lined up with the bottom mark of the throttle cam shouldn't it be alined with the top one? Any other ideas
Thanks
Stratos http://www.bassboatcentral.com/smileys/doh.gif