need help identifying a model of a bubble back

B

bck419

Cadet
Joined
Nov 8, 2010
Messages
7
hey good members, I have a 80's something bubble back V4 runs great and love it... but low compression all around-about 90 , really low on #3 -60. but the issue is I can not find any id #'s on it any where!! gotta get parts!! I was hoping if I post some good pics someone give me close year model? thanks
 
E

emdsapmgr

Supreme Mariner
Joined
Dec 9, 2005
Messages
11,551
Re: need help identifying a model of a bubble back

model identification 2.jpgYou can look for a casting plug on the top of the engine. Here is a typical plug, about the size of a quarter. On many of the early crossflows, it will have the same information that is stamped on the serial ID tag on the transom brackert. You've got a major internal issue with the compression at only 60#. You need to pull that head and inspect the cylinder walls and check the condition of the ringset on that piston, Also check for piston scuffing in the cylinder.
 
Bob_VT

Bob_VT

Moderator & Unofficial iBoats Historian
Staff member
Joined
May 19, 2001
Messages
26,022
Re: need help identifying a model of a bubble back

Welcome to iboats.

Sounds like if this motor is new to you.......it is time for a full decarb and then check the compression again. Decarb will "hopefully" get the carbon off the rings and give you better performance. It is the cheapest repair/maintenance you can do.
 
B

bck419

Cadet
Joined
Nov 8, 2010
Messages
7
Re: need help identifying a model of a bubble back

100_2325.jpg100_2322.jpg100_2324.jpg100_2321.jpg100_2323.jpg100_2325.jpg100_2322.jpg100_2324.jpg100_2321.jpg100_2323.jpgchecked plug no #s, looks to be a rebuilt powerhead.. also did the decarb thing no better compression but runs better then ever!!
 
E

emdsapmgr

Supreme Mariner
Joined
Dec 9, 2005
Messages
11,551
Re: need help identifying a model of a bubble back

That new style carb linkage first came out around 1987. It has the late model carbs. I don't see the 1987 dual power packs, so best guess is that it is at least a 1988 110 hp V4 crossflow.
 
B

bck419

Cadet
Joined
Nov 8, 2010
Messages
7
Re: need help identifying a model of a bubble back

thanks emdsapmgr, That does help alot!!
 
You must log in or register to reply here.
Top