9.9 TO 18 HP

[FISHERJEEP]

I have a 1987 9.9hp Nissan. Nissan made this same engine in 12,15 and 18hp. same bore, stroke, etc. My question is can I make my 9.9 into an 18hp? Is the only differance the carb.? I don't think it could be anything to do with the ignition....any ideas??

 

[John_S]

Re: 9.9 TO 18 HP

Elvin is the expert, but the 18hp two stroke has a different bore. It is 60mm vs 55mm of the 9.9 and 15hps. Same 52mm stroke on all three. Back when I purchased my 18E, I thought the mod to take a 9.9 to 15 had to do with a timing advance cam. Might have been a carb part, as well, since this was a conversation back in 1997.

 

[FISHERJEEP]

Re: 9.9 TO 18 HP

Anyone know for sure? I would realy like to try this. <br />By the way I am installing a new water pump this weekend (first time) anything special I should know about?

 

[TOHATSU GURU]

Re: 9.9 TO 18 HP

You can turn the 9.9 into the 15 by changing the timing cam...it'a available from any Nissan or Tohatsu dealer.

 

[FISHERJEEP]

Re: 9.9 TO 18 HP

Thanks, I don't mean to be a pest but is this simply a matter of switching out the cam or would the carb need to be rejetted?<br />Also where is the cam located?<br />Anyone know the part number?<br /><br />thanks

 

[buckeye_sean]

Re: 9.9 TO 18 HP

FJ - I bought a cam off Elvin for my 9.9 Nissan last year. Mine is also late 80's or early 90's (it's mainly dark blue with a silver/red/blue hood). All the cam does is allow the butterfly on the carb to open farther - but it does make quite a bit of difference on the top end. No rejetting required. Mine was a little bit of a pain since my model has the electric starter that I had to remove to get the bracket rotated around to remove the old cam.<br /><br />BTW - The timing cam is directly behind the carburetor. Follow the linkage/wire thingy up and away from the carb. There is a plastic roller on othe end that rides against the cam itself.

 

[FISHERJEEP]

Re: 9.9 TO 18 HP

Sounds good. Elvin, do you know the part no.? Can I buy this part from you?

 

[TOHATSU GURU]

Re: 9.9 TO 18 HP

It's a part number 36267180M, available from any Nissan or Tohatsu dealer.

 

[FISHERJEEP]

Re: 9.9 TO 18 HP

Thanks, I just found this forum the other day and have already got some great help. This forum is 10 times better than Boat U.S.. All they talk about is their 30' and up cruisers.<br /><br />Thanks Again<br />I will let you know how it works out.

 

[FISHERJEEP]

Re: 9.9 TO 18 HP

I'm having trouble finding this part. There isn't a dealer near me and I would like to buy this on the internet. do any of you know where on the internet I could get this part?<br /><br />Thanks

 

[TOHATSU GURU]

Re: 9.9 TO 18 HP

You just need to contact any Nissan or Tohatsu dealer. I don't know of dealer who actually lists that particular part on an internet site, but they all have it.

 

[mattsaks]

Re: 9.9 TO 18 HP

FISHERJEEP, try Elvins online shop. www.internetoutboards.com

 

[FISHERJEEP]

Re: 9.9 TO 18 HP

Thanks, I got it.

 

[FISHERJEEP]

Re: 9.9 TO 18 HP

Hey, BuckeyeBoater How did you get the cam off? When I try to remove the screws they hit the block. It looks almost like I will need to remove the pull start and flywheel. Did you need to do this?