3800 rpm wall
#1
Registered
Thread Starter
Join Date: Oct 2013
Location: Buckner, KY
Posts: 32
Likes: 0
Received 0 Likes
on
0 Posts
3800 rpm wall
Gentlemen, I am new to this site. I hate to beat a dead horse about an RPM range but I could use some help. I have a 24' 1999 Baja Boss H2X with a 7.4 MPI and a Bravo one drive (don't know ratio because it's not on the drive ANYWHERE) running a 23P prop. Engine starts and runs great, no hesitation, no missing, throttle response is very crisp. We have done a compression test and everything is great. We are currently doing a leakdown test to verify no other problem exists. The issue I am having is the engine RPM will not go over 3800. I have ran a 21P prop and no difference. I have even used the trailer switch while running down the water and raised the prop out until it would throw an 80' rooster tail and the engine RPM never went above 3800. Never did it even try to hit the rev limiter. We have hooked it up to a computer and went for a ride, verified that my tach was reading correctly and it matched the computer to the tee, no codes, no warning buzzers. This has me stumped, and I'm not one for throwing money at something and getting the same results. Do any of you have any suggestions on what this could be?
#2
coolrunning racing
VIP Member
I would check for a fuel restriction. Verify the pick up tube in the tank is clear, nothing in the anti siphon valve. The best test would be a vacuum gauge connected to a tee fitting placed in the fuel feed line to the engine. You are looking for little to no vacuum.
#4
Registered
Thread Starter
Join Date: Oct 2013
Location: Buckner, KY
Posts: 32
Likes: 0
Received 0 Likes
on
0 Posts
I would check for a fuel restriction. Verify the pick up tube in the tank is clear, nothing in the anti siphon valve. The best test would be a vacuum gauge connected to a tee fitting placed in the fuel feed line to the engine. You are looking for little to no vacuum.
#8
Registered
Thread Starter
Join Date: Oct 2013
Location: Buckner, KY
Posts: 32
Likes: 0
Received 0 Likes
on
0 Posts
#9
Registered
Thread Starter
Join Date: Oct 2013
Location: Buckner, KY
Posts: 32
Likes: 0
Received 0 Likes
on
0 Posts