1987 Mercruiser 120 HP. Backfires Help
#1
Registered
Thread Starter
Join Date: Oct 2020
Posts: 2
Likes: 0
Received 0 Likes
on
0 Posts
1987 Mercruiser 120 HP. Backfires Help
In water the rpm’s won’t go past 1700. On land after putting pure gas in, changing plugs, put mechanic in a bottle in with gas, it did run better with muffs on, ON LAND. Problem is, when I full throttle fast, the engine backfires a little and wants to stop running. When accelerating slowly it will get up to 5000 rpm’s with no problem. Can anyone tell me what the problem is? Timing? Too rich? Too lean? I have electronic ignition in. Thank you
The following users liked this post:
bajaman (10-28-2020)
#3
Registered
Thread Starter
Join Date: Oct 2020
Posts: 2
Likes: 0
Received 0 Likes
on
0 Posts
Backfires
Yes, I think that’s my next step for this winter. Is there a link that shows how to adjust the carb? Maybe on YouTube. Btw, I’m restoring a 1987 Thundercraft 170 citation. If there is anyone in Nashville TN that would like to work together, your and my boat, I’m ready to restore.
The following users liked this post:
1BIGJIM (10-30-2020)
The following 4 users liked this post by mike tkach:
#7
Platinum Member
Platinum Member
Did the boat run well previously? Or did you purchase it like this?
Might want to replace the fuel filter/water separator, dump the carb bowl, try again.
Water in fuel/carb is a very common cause for what you describe.
We are located in Madison TN.
But you'll save money and learn your boat better if you do it yourself. Just start with a real good troubleshooting guide.
m
Might want to replace the fuel filter/water separator, dump the carb bowl, try again.
Water in fuel/carb is a very common cause for what you describe.
We are located in Madison TN.
But you'll save money and learn your boat better if you do it yourself. Just start with a real good troubleshooting guide.
m