redbird555
Member
Hi all,
Long time lurker first time poster here...anyway I have a set of 98 twin 175 ocean pros on my 251 mako. To my knowledge they have never been rebuilt or had the carbs done.
The boat sat for about 18 months prior to me getting it, the issue I am having is that the port motor seems to have a much harder time starting and does not reach the same rpm as the stbd. I can usually get the stbd motor to start after sitting for a few days with just the choke and a little throttle. The port motor always needs the ball pumped and then some finesse to get her to crank up. Once warmed up they both idle well and throttle up smoothly.
The issue I'm having besides the cold start is that the stbd motor seems much more responsive in the midrange (gains rpm very quickly with throttle input) and the port motor always needs more throttle to achieve the same rpm. At wot the stbd engine is at 5900 or so and the port is 5400.
I ran a compression test on the engines and the port engine with less rpm has compression from 100-112 on all cylinders and the stbd engine ranges from 105-120. So they both seem very healthy.
At this point I'm thinking it might be time for a carb rebuild but is there anything else I should check first?
Long time lurker first time poster here...anyway I have a set of 98 twin 175 ocean pros on my 251 mako. To my knowledge they have never been rebuilt or had the carbs done.
The boat sat for about 18 months prior to me getting it, the issue I am having is that the port motor seems to have a much harder time starting and does not reach the same rpm as the stbd. I can usually get the stbd motor to start after sitting for a few days with just the choke and a little throttle. The port motor always needs the ball pumped and then some finesse to get her to crank up. Once warmed up they both idle well and throttle up smoothly.
The issue I'm having besides the cold start is that the stbd motor seems much more responsive in the midrange (gains rpm very quickly with throttle input) and the port motor always needs more throttle to achieve the same rpm. At wot the stbd engine is at 5900 or so and the port is 5400.
I ran a compression test on the engines and the port engine with less rpm has compression from 100-112 on all cylinders and the stbd engine ranges from 105-120. So they both seem very healthy.
At this point I'm thinking it might be time for a carb rebuild but is there anything else I should check first?