Problem With Yamaha 200 - The Hull Truth

The Knotts · 11-23-2008, 05:22 PM

Hey guys, I have a problem and don't know where to go with this one. I have twin yamaha 200hp 2 strokes they are 89's. Runn well except the starboard motor when it warms up (after running for about 5-10 minutes at 3600 rpms) starts dropping down to 3200 rpms. Wehn I push the throttle up it doesn't go up, it will maybe 100 rpms and then start bouncing up and down about 1-200 rpms above where it was. The engine runs fine when it is kept at 3200 rpms. I don't know, I am thinking it is either the fuel pump or the stator but I don't see any fuel being dumped into the water. It revs up fine when not under load. Any adivce you guys could offer would be greatly appreicated. Thanks in advance.

49erJim · 11-23-2008, 05:23 PM

post this in the vendor forum Under A1 he will get back to you fast.

wetneck · 11-23-2008, 06:47 PM

carbs

JUSTINTIME · 11-23-2008, 07:00 PM

rebuild the carbs
replace all fuel filters
replace fuel pumps

The Knotts · 11-24-2008, 06:49 PM

I put in a brand new water seperator and the fuel filter looks clean. What else could it be? The carbs were rebuilt less than 100hrs ago. I will change the pumps but wouldn't you see a lot of fuel in the water? Is there any easy way to test if it is the fuel pump?

JUSTINTIME · 11-24-2008, 06:52 PM

yes
you can pull them off and pump the primer bulb and look for leaks

grady26 · 12-11-2008, 11:43 AM

First post. I have been reading THT for a few years. I am having the same problems with my 1998 150. I was wondering if you got the problem fixed?

On another note I wished I was in the boat buying market now. There are some great deals out there.

JUSTINTIME · 12-11-2008, 11:55 AM

Hey grady26

if you start a new thread on here, more people will chime in
check out greatgrady.com