Hello,
I have a 1988 Trophy 2460 with a OMC Cobra 5.7 with a Rochester Quadrajet.
A few weeks ago, I installed a rebuilt Quadrajet, which greatly helped performance, but when I installed it, I reused the old carb to manifold gaskets and spacer. Last week I got new gaskets and spacer so I threw away the old ones and installed the new ones. Immediately, I had issues.
After installing the new spacer and gaskets, I started the boat, and the idle was very high. It was over 2500 rpms. I used some carb cleaner to check for leaks and I didn't find any. I adjusted the idle then went for a sea trial. The performance was terrible at all rpms. The boat couldn't get on plane. 13mph max.
What could have caused this?
I have since noticed that there are different types of gaskets and spacers. Some are open in the middle and some seperate the four throttle plate bores. I have tried different types between the carb and spacer and between the spacer and manifold. I even tried both types of spacers(open in the middle and one that separates the bores). Perhaps I'm supposed to use a specific combination of these?
Could I have damaged something on the carb when I first replaced the gaskets?
What else could it be?
My next step will be putting on my old carb. My old carb ran ok except for the secondaries, so that should at least let me know whether or not it's the carb.
Thanks!
I have a 1988 Trophy 2460 with a OMC Cobra 5.7 with a Rochester Quadrajet.
A few weeks ago, I installed a rebuilt Quadrajet, which greatly helped performance, but when I installed it, I reused the old carb to manifold gaskets and spacer. Last week I got new gaskets and spacer so I threw away the old ones and installed the new ones. Immediately, I had issues.
After installing the new spacer and gaskets, I started the boat, and the idle was very high. It was over 2500 rpms. I used some carb cleaner to check for leaks and I didn't find any. I adjusted the idle then went for a sea trial. The performance was terrible at all rpms. The boat couldn't get on plane. 13mph max.
What could have caused this?
I have since noticed that there are different types of gaskets and spacers. Some are open in the middle and some seperate the four throttle plate bores. I have tried different types between the carb and spacer and between the spacer and manifold. I even tried both types of spacers(open in the middle and one that separates the bores). Perhaps I'm supposed to use a specific combination of these?
Could I have damaged something on the carb when I first replaced the gaskets?
What else could it be?
My next step will be putting on my old carb. My old carb ran ok except for the secondaries, so that should at least let me know whether or not it's the carb.
Thanks!
