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  #1   IP: 37.19.212.200
Old 07-22-2021, 06:21 PM
idreamOfSailing idreamOfSailing is offline
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Engine throttle is lacklustre under load

I just replaced my carburetor with a new one from Moyer. It seems to be running okay as it starts, idles and throttles up well when disengaged from gear, however when in forward gear the engine seems rather dull and does not accelerate when giving it throttle the way it used to. It doesn't seem to rev up anymore. Also, maybe it's my imagination but it seems to be making a dull, slight thumping sound. I'll check the plugs for spark and try a compression test too but just wondered in the meantime if anyone has any ideas as to what it can be.
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  #2   IP: 104.174.83.118
Old 07-22-2021, 06:29 PM
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Something to check

Check the advance weights inside the distributor under the points plate. Please do this without removing the distributor from the engine to preserve the timing.

Does applying choke make any difference?
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prior boats 1987 Westsail 32, 1970 Catalina 22
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Old 07-22-2021, 06:52 PM
idreamOfSailing idreamOfSailing is offline
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Thanks ndutton, but I have no idea of what you just said. I have to do what?
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  #4   IP: 104.174.83.118
Old 07-22-2021, 06:57 PM
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Quote:
Originally Posted by idreamOfSailing View Post
Thanks ndutton, but I have no idea of what you just said. I have to do what?
Page 3-3 in your Moyer Marine Service and Overhaul Manual including pictures. Please confirm you have the manual.
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1977 Catalina 30
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prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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Old 07-22-2021, 07:14 PM
idreamOfSailing idreamOfSailing is offline
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Hi, I do not have the manual, didn't know there was one. I have electronic ignition, would the manual still help?
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Old 07-22-2021, 07:27 PM
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Quote:
Originally Posted by idreamOfSailing View Post
Hi, I do not have the manual, didn't know there was one. I have electronic ignition, would the manual still help?
honestly, unless you want to sell the boat in a few weeks... you cannot make a better investment. Will save you a fortune in ignorant mechanics, make your engine reliable and trustworthy.

https://moyermarine.com/product-category/manuals/

And make sure to check the videos... there is one on ignition!!!
https://www.youtube.com/channel/UC8G...ZhCBdJg/videos
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  #7   IP: 37.19.212.200
Old 07-22-2021, 07:35 PM
idreamOfSailing idreamOfSailing is offline
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Now that's a good idea...there's been something or another wrong with this thing for the last six years I've had it...selling it seems really good right now but I'm not one to pass on my problems to unsuspecting others.

I've got the manual in my cart now. And you're right about ignorant mechanics, I guess the old axiom is true, if you want a job done right you have to do it yourself!

It's not an ignition thing though, she starts fine and idles fine, just doesn't seem to have any life under load.

Thanks for the help.
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Old 07-22-2021, 07:38 PM
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Quote:
Originally Posted by idreamOfSailing View Post
Hi, I do not have the manual, didn't know there was one.
That is NOT what I was hoping to hear.

Quote:
I have electronic ignition, would the manual still help?
Oh yeah, in spades.
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  #9   IP: 165.225.20.156
Old 07-23-2021, 12:54 AM
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[QUOTE=idreamOfSailing;126316]

It's not an ignition thing though, she starts fine and idles fine, just doesn't seem to have any life under load.
/QUOTE]

the weights and springs of the distributor are not for starting / idle, but for only load operation
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Old 07-23-2021, 02:37 AM
JOHN COOKSON JOHN COOKSON is offline
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Quote:
Originally Posted by idreamOfSailing View Post
. It doesn't seem to rev up anymore. Also, maybe it's my imagination but it seems to be making a dull, slight thumping sound.


Is something fouling the prop that is hitting the boat?

ex TRUE GRIT

Last edited by JOHN COOKSON; 07-23-2021 at 03:01 AM.
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Old 07-23-2021, 07:45 AM
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Quote:
Originally Posted by idreamOfSailing View Post
I just replaced my carburetor with a new one from Moyer. It seems to be running okay as it starts, idles and throttles up well when disengaged from gear, however when in forward gear the engine seems rather dull and does not accelerate when giving it throttle the way it used to. It doesn't seem to rev up anymore. Also, maybe it's my imagination but it seems to be making a dull, slight thumping sound. I'll check the plugs for spark and try a compression test too but just wondered in the meantime if anyone has any ideas as to what it can be.
A swim is in order!
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Old 07-23-2021, 12:28 PM
idreamOfSailing idreamOfSailing is offline
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I'm ordering the manual but it's going to take time to get here (Ontario). In the meantime does anyone have Page 3-3 of the Moyer Marine Service and Overhaul Manual to share here so I can start work now?
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Old 07-23-2021, 01:24 PM
jcwright jcwright is offline
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This is one of the MMI videos that surcouf mentioned in a previous post:

https://youtu.be/DKxwfBmcTkM

It shows how to inspect the advance mechanism.

The Moyer overhaul manual is under copyright, which is why you’ll see people on the forum refer to it but not post copies.

Hope the video helps you get started. Feel free to ask if you get stuck.

Jack
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Old 07-23-2021, 01:36 PM
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You still need to look under the boat before you get into anything else.
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Old 07-23-2021, 01:47 PM
idreamOfSailing idreamOfSailing is offline
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I'll slip into the water tomorrow to have a look.
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Old 07-23-2021, 11:31 PM
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I can guarantee that if you have electronic ignition it is easy to forget to lube the advance weights underneath....been there done that..couple old Harley motorcycle buddies reminded me of that about 6-7 years ago. If you can get it started, it will run wide open, but when you drop the throttle, the timing advance is stuck and it won't run. Pull the e-plate and make sure the advance plates move freely...and pony up the few bucks for the Moyer Manual!
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Last edited by sastanley; 07-23-2021 at 11:33 PM.
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