18hp tohatsu 2-stroke M18C2 model no carb kit!?

[whitesnook]

hello,

I just bought a really nice super clean tohatsu 18hp 2-stroke and wants to get a carb rebuild kit but no longer available????? what else is no longer available? I'm totally screwed right??

I felt like I waste my money for this model.

is there any way to get a nissan model carb rebuild kit? or is there any way to modifly it?

this motor is really nice but I guess I have to sell it.....

thanks

 

[whitesnook]

Re: 18hp tohatsu 2-stroke M18C2 model no carb kit!?

I wonder if NS9.9B2 or NS15B2 with carb kit still available? It has the same carb but different throat diameter.

 

[pvanv]

Re: 18hp tohatsu 2-stroke M18C2 model no carb kit!?

You do realize that you have a 20+ year old motor, right?

 

[TOHATSU GURU]

Re: 18hp tohatsu 2-stroke M18C2 model no carb kit!?

http://www.internetoutboards.com/partdetail.asp?id=264

 

[whitesnook]

Re: 18hp tohatsu 2-stroke M18C2 model no carb kit!?

thanks for the replies.

Thanks for the carb kit! but will I able to get a CD ingition, coils, and stuff like that for future. I just want to get all the spare parts and save it.

The motor doesn't looks like 20+ years old motor and I'm new at the tohatsu 2-stroke. it's grey motor and looks almost as new condition. I ran it today and it ran all day without any problems.

I dont know the year of the motor it's M18C2 350A 77760

Will I able to order a C model for parts? I dont see 18C2 model for CD, Coils and stuff like that.

Please let me know before I order more parts.... Thanks for your help guys.

 

[Sea Rider]

Re: 18hp tohatsu 2-stroke M18C2 model no carb kit!?

Place pics of CD and Ignition Coil for better identification with actual parts, probably same.

 

[32bit.flannel]

Re: 18hp tohatsu 2-stroke M18C2 model no carb kit!?

Hi guys, Sorry for the novel buttttt:

I'm reviving this thread to digress just a tad. I recently got this same motor with a fishing boat I bought...got a helluva deal on it all so I'm OK with putting a few bucks into the engine to get it running right. At this point it starts up and runs if I pump the throttle a bit but it ultimately dies and refuses to idle. It sounds damn strong, and compression is right about 90 per hole. After looking at the engine manual's small section on the carburetor my guess is the Pilot circuit is to blame (I'm a 4bbl Holley guy so I'm assuming the "Pilot" circuit is basically just the Idle circuit...correct thinking?). I'm new to 2-strokes and outboards and all that so I'm looking for insight as to the best way to approach this. Based on the contents of this thread my thought is it would be best to avoid cracking open the carburetor... Do you guys think just running some carb/choke cleaner or seafoam through might be enough to get that Pilot jet cleared up, or should I just not waste the time and yank the carb and order the $120 rebuild kit? Or perhaps you all have other thoughts entirely (and yes I know it's an old motor and parts are getting scarce and all. But hell our 1950's/60's Evinrudes run just fine so why can't this!? lol) Guy I bought it from said it ran great last time he used it (5 years ago) and that it had no spark...turns out it had spark but doesn't run so fine so my assumption/hope is just that carb's gunked.

Also my dad said he though he heard an intermittent/random 'clank' a few times when it ran. I thought it was just being a stinky noisy 2-stroke but figure it won't hurt to ask if there is anything you all might know about that I should check out. I know a rode knock or piston slap when I hear it, and I don't think I heard that...but then again it is kinda hard to get a good listen with the stinky noisy nature of the beast. I also have a video with sound of it running that I took with my phone...it's too big/wrong file type to post but I can email if anybody wants to hear it run/bog/die.

Any/all help is much appreciated. Thanks guys,

Nick

 

[TOHATSU GURU]

Re: 18hp tohatsu 2-stroke M18C2 model no carb kit!?

"runs if I pump the throttle a bit but it ultimately dies and refuses to idle"

Fuel system issue...Which means anything in the fuel system. You just have to start at one end and work through it until you find the problem...No shortcuts on this.

 

[pvanv]

Re: 18hp tohatsu 2-stroke M18C2 model no carb kit!?

"runs if I pump the throttle a bit but it ultimately dies and refuses to idle"

Fuel system issue...Which means anything in the fuel system. You just have to start at one end and work through it until you find the problem...No shortcuts on this.

Yup. Some folks swear by the "seafoam" approach, others swear at it. As Elvin mentioned, the problem (which may not be in the carb) is likely somewhere in the overall fuel system. If in the carb, our shop has only had good results with proper carb cleanings -- no shortcuts -- meaning a complete carb disassembly and 4-hour soak in Tyme or similar "real" carb dip, followed by a blow-out using the spray cleaner, then a careful assembly and adjustment. In most cases, the poor fuels that we have been getting (since 2004 in our area) cause more varnishing, and if the carb wasn't run dry religiously at the end of each day, the low speed circuits get clogged.

 

[32bit.flannel]

Re: 18hp tohatsu 2-stroke M18C2 model no carb kit!?

Thanks for the replies guys. I started with a fresh tank of gas, new hose from the tank to the engine, replaced the rubber lines to/from the filter/carb, cleaned the filter...so that brought me to the carb. Yesterday I ran a bunch of seafoam directly into the fuel inlet line into the carb, liberally applied carb/choke cleaner and am going to let it sit a bit. If that doesn't work I'll yank the carb and hope I don't rip up the gaskets Any other parts of the fuel system that I've overlooked?

Thanks again guys.

 

[pvanv]

Re: 18hp tohatsu 2-stroke M18C2 model no carb kit!?

Keep your fingers crossed. I did once successfully clean up a marginally poor idle in a similar manner. But 99 times out of 100, we have needed to do a proper cleaning -- with disassembly, soak, blow out, and reassemble/adjust.

 

[32bit.flannel]

Re: 18hp tohatsu 2-stroke M18C2 model no carb kit!?

Keep your fingers crossed. I did once successfully clean up a marginally poor idle in a similar manner. But 99 times out of 100, we have needed to do a proper cleaning -- with disassembly, soak, blow out, and reassemble/adjust.

You've mentioned 'adjust' a couple times now...where can I find good information on that? The carb section in the engine's manual is about two pages long and I don't recall seeing anything like that in there.

 

[pvanv]

Re: 18hp tohatsu 2-stroke M18C2 model no carb kit!?

What manual do you have?

 

[32bit.flannel]

Re: 18hp tohatsu 2-stroke M18C2 model no carb kit!?

It appears to be a factory owners/users manual that would have come with the unit. It has a picture/drawing of all four HP models from that year on the cover. The one strange thing is that the model numbers listed don't quite match up what my motor's plate says...example: The 18HP model on the cover is "M18C/350A" but on my motor it is "M18C2/350A", so I'm wondering if the manual isn't the wrong one in the first place.

How can I find out the year of the motor? The guy I got it from bought it from his brother-in-law, who supposedly got it new back in 1990 (I have the bill of sale from that purchase but no proof the motor was actually new at that time). The manual's date is April of 1984, so I assumed the motor was used 6 years at the time of this sale...but perhaps it really was new but they just gave him the wrong manual?

 

[pvanv]

Re: 18hp tohatsu 2-stroke M18C2 model no carb kit!?

The 18C2 is just a minor refinement of the 18C. Not that big a deal. Do you have the parts catalog, the owner's manual, or the service manual? Service manuals are 8-1/2 x 11, while parts catalogs and owner's manuals are printed on a smaller format. The current Factory service manual covers all Tohatsu 1 and 2 cylinder carbed motors, but long ago, they separated the manuals by motor family. Most owner's manuals are still available online at http://www.tohatsu.com/tech_info/manuals.html, but unfortunately for you, they don't go all the way back to the 18C (only to the 18D).

The year of the motor would mean nothing. Possibly affect the NADA price by a penny, but that's all. For servicing, the model/serial is everything. If you are curious about when it may have been built, call Tohatsu at 214-420-6440 with your serial number, and you may get lucky -- they may still have some records from warranty cards back that far.

FWIW, Carb adjustments for your motor would include pilot screw (low speed mixture) and float height/drop, as well as idle stop settings.

 

[32bit.flannel]

Re: 18hp tohatsu 2-stroke M18C2 model no carb kit!?

It must be the service manual as it is an 8.5x11 booklet. Should I just pay attention to where the screw and float are set when I take it apart and put it back the same when I rebuild, or should my handy booklet give me specs that I should reset it to?

 

[pvanv]

Re: 18hp tohatsu 2-stroke M18C2 model no carb kit!?

Definitely make note of the settings before disassembly, as it gives you a point of reference. The float should be parallel to the carb casting when the carb is inverted. The idle mixture screw must be adjusted on the motor; same is true for the idle speed stop screw. I highly recommend a good shop tach for those settings.

 

[32bit.flannel]

Re: 18hp tohatsu 2-stroke M18C2 model no carb kit!?

So basically just adjust the low speed to where she wants to run best, got it. I do have a decent tach I can use for the idle screw, about what idle speeds should it run in both Neutral and Drive (I can check the manual when I get home, just figured I'd ask while I have ya)?

 

[pvanv]

Re: 18hp tohatsu 2-stroke M18C2 model no carb kit!?

600-700 in gear, 800-900 in neutral. Keep in mind that the pilot screw setting and the idle stop adjustments are interrelated. One will affect the other to a slight degree. We usually dial in the mixture for max rpm somewhere around 900 rpm in neutral, and readjust the stop, then re-check the mixture. Once you have max rpm on the pilot mixture, with the stop set to 900, you will likely want about 1/8 turn richer, to accommodate differences in temperature and oil mix.

 

[32bit.flannel]

Re: 18hp tohatsu 2-stroke M18C2 model no carb kit!?

Paul, you are both a gentleman and a scholar, and I greatly appreciate all of your information I am going to tear into it this weekend, I'll let ya know how it turns out. Thanks again.