PDA

View Full Version : 1992 Prostar w/ 351


Capt. K
05-13-2010, 12:59 PM
my engine has been hard to start for several years - cold or hot. I'm not sure if the 351 is a HO engine or standard. I'm considering installing an electronic ignition. My question is, do I have to replace (upgrade) the coil when installing an electronic ignition? How can I determine if I have a HO eninge or standard engine?

cbryan70
05-13-2010, 01:02 PM
what carb is on it?

Capt. K
05-13-2010, 01:27 PM
I'm not sure

Capt. K
05-13-2010, 01:28 PM
how do I determine what carb I have.....I had it replaced a couple years ago

cbryan70
05-13-2010, 01:40 PM
I am not the one to ask, I just figured that would be the first question. I beleive that if it is the 351HO you will NOT have a 4160. Cant thing of the name of the 'bad' carb model currently

slickwater1
05-13-2010, 02:05 PM
mine is hard to crank sometimes also. I really think mine loads up. it really is a pain sometimes when she sounds like the battery is dead but it really is not. i have replaced everything except the ignition. I would be interested in doing that also.

east tx skier
05-13-2010, 02:29 PM
The carb is one way to tell, if it is the original carb that is. If the fuel line going to the carb splits off into two sections going to the front and rear starboard side of the carb, then it is likely the original 4010, indicating a 351 HO engine with 285 hp. If not, then it is possible that the carb was replaced prior to your ownership of it (or that you have the 250 hp 351 engine).

If you have a single fuel inlet to the carb, look at the heads. GT40 heads will have 3 vertical bars on the side of the head.

http://www.skidim.com/images/351HOhead.jpg

Also, if the engine cowling (plastic piece over the flame arrestor) says 285 hp on it, it's pretty likely (barring a replacement of the cowling at some point) that you have the 351 HO.

If you have the 4010 carb, and are having idling issues, I would not be surprised. You would not be the first. The 4160 behaves much better in my experience.

GuitsBoy
05-14-2010, 04:08 PM
I recently replaced my 1992 205's carb with a 4160 trying to improve idle, and while it helped some, it certainly did not fix it. After replacing the coil - twice - we finally got all teh ignition gremlins ironed out, and it starts and runs perfectly. Also, If you do indeed have a 92 with a HO motor (285 HP) then you probably already have electronic ignition. Pop the cap and rotor and see.

CantRepeat
05-14-2010, 04:37 PM
I was going to say, my 92 351/285 hp is a factory electronic ignition system. I've rebuilt the carb on mine and after about 30 seconds of run time it idles pretty well.

Capt. K
05-14-2010, 05:43 PM
I have a 4160 carb. If I change to an electronic ignition, do I have to replace the coil?

I suspect I have a non HO engine, but I will pul the distributor cap to verify.

east tx skier
05-14-2010, 05:48 PM
I was going to say, my 92 351/285 hp is a factory electronic ignition system. I've rebuilt the carb on mine and after about 30 seconds of run time it idles pretty well.

Was 92 the first year for EI?

Kyle
05-14-2010, 05:51 PM
I have a 4160 carb. If I change to an electronic ignition, do I have to replace the coil?

I suspect I have a non HO engine, but I will pul the distributor cap to verify.

I am betting that you have an electronic ignition. If you do have one you need to make sure you have your gap set right between the module and the part that spins that looks like splines. The gap is important.

If you dont have an electronic ignition then get one. They are not too costly and are a good improvment. As far as the coil.... I have done 3 ignition modules on various brands of inboards and have always used the same coil without any problems. I know the boats are still using the factory coil and still using the same set up to this day. All 3 were guys in the ski club and I see their boats running up and down the couse just fine.

Electronic Ignition is a great upgrade from points and will start much easier.

TMCNo1
05-14-2010, 05:57 PM
First thing I would check is the timing if it's hard to start and then go from there, 10 degress BTDC.

Kyle
05-14-2010, 06:02 PM
First thing I would check is the timing if it's hard to start and then go from there, 10 degress BTDC.

My Dumb A should have mentioned that too. I believe I had to do mine at 11 deg but if this is off then you will have issues as well. As good ole #1 said start there first.

Thanks #1

Cloaked
05-14-2010, 06:37 PM
If you have the 4160 carb (most likely you do) with an electric choke, make sure it is set properly. The instructions for the electric choke are on into the short clip.

http://www.youtube.com/watch?v=2YCbkaXuqvE


.

sic0048
05-21-2010, 01:45 PM
I am betting that you have an electronic ignition. If you do have one you need to make sure you have your gap set right between the module and the part that spins that looks like splines. The gap is important.

Do you know off hand what that gap should be? I have a '93 with the HO 285hp engine.

Thanks,

at7driver
06-13-2010, 05:19 PM
I had a hard starting problem on our 1989 Prostar with the 351, just bought her last week as well. Acted like the battery was low on juice, I backed the timing off just a smidge and she fires right up and runs smooth.