Rib/Sib specific motor applications.

[lester]

JSP, hopefully you find this. With the Yamaha 15, it is an acceptable weight for me to carry by myself and load on the transom alone...add a few more pounds and this becomes a chore. If you are just using your boat to cruise with the family when you RV, I would definitely pick up the 15 over the 25, even with the small price difference between the two. A buddy of mine let me borrow a 2007 Yamaha 25hp two stroke long shaft and it was tough to carry and load by myself...I definately wouldn't want to do it every time I go out. Also if you are traveling and hauling this outboard, the powerhead alone for the 15hp appears to me to be about 25% smaller than the 25hp. Are you looking to pick up a motor soon?

 

[jspringator]

Re: Rib/Sib specific motor applications.

I'm going on a week long trip to Florida between Christmas and New Years. I think I've got all the bugs worked out of my Evinrude, but I hurt my elbow starting it in May and it still hasn't healed. I couldn't play golf all summer. I don't really want to spend the money, but I think it may be the right thing to do. The motor ('Rude) only weighs 85 pounds, and it pushes the boat faster than I need to go, but it takes quite a pull to start it.

 

[lester]

Re: Rib/Sib specific motor applications.

JSP, is the manual starting what makes this hard? Is this the motor that you said keeps giving you mechanical problems? 85 lbs is really good for a 25 hp.

 

[jspringator]

Re: Rib/Sib specific motor applications.

I have had a series of small problems. Starting pawl broke the first day. Fixed it. Outdrive leaked, and I had it sealed and a new drive shaft installed. New points, coils and plugs. While in Florida, a plastic part in the throttle linkage broke, and I replaced all the plastic pieces. I did someting to the throttle stop which caused a problem, and got that fixed. The ball wouldn't pump hard and I discovered the white teflon tape I used to seal the screw in fitting on the plastic tank disolved, and I presume that problem was caused by air entering the fuel line. Usually it starts on the first or second pull. The day I hurt my elbow I couldn't get it to start. I believe air was coming through the metal fuel fitting connection to the plastic tank. It may have a weak fuel pump. I decarboned it and it is really starting to run good. It does have a spot for an electric starter, but I wouuld rather not have that extra complication.

 

[lester]

Re: Rib/Sib specific motor applications.

It doesn't quite seem like its time to put this motor to rest, but a new one sure would be nice...it is a different story if you were using this just to putz around your hometown lake, but if i were you, I'd want to make sure that I had something VERY reliable when I'm using my inflatable as a boat for travel purposes to be used on waters away from home. Probably time to bite the bullet and get a new one. You might even be able to catch a deal on a new Yamaha from a dealer now that boating is slowing down for the year. Possibly find a dealer that has never used 05' or 06' models in the warehouse. I meant to ask you, do you have the lifters or any other planing device on your inflatable? Also, how does the wife feel about $2000 for a motor? Most women I meet can't believe how much "that little motor" actually is costs. I always tell them everything about boating is expensive...and I'm only shopping in the modest inflatable world.

 

[jspringator]

Re: Rib/Sib specific motor applications.

I've got a Stingray fin. Once it starts it's OK for the day, and I think my very occasional starting issue is due to the deterioration of the teflon tape in the fuel line.

 

[jspringator]

Re: Rib/Sib specific motor applications.

I think I may have found the reason for my hard pull. The starter rope must be cut to a precise length to take advantage of the oval shaped pully which uses "the lever principle to overcome starting effort required when the pistons reach the top of their compression strokes." Manual, page 8-2. Tomorrow, I'm going to pull off the starter assembly and verify the proper placement of the "rope alignment marks".

 

[jspringator]

Re: Rib/Sib specific motor applications.

Of course, it was way off. Ordered some 7/32 cord online. Couldn't find any locally. I'm going to cut it to its required length of 72 1/4 inches, fuse the strands for 1/2 inch on each side, and take the starter assembly to my lawnmower repairman to fix. If you've done one recoil starter...

I'm fixing the tank seal. I hope this will solve my problems with this motor, I spent $400 for it on e-bay and another $400 in repairs. Essentially an 85 pound 25 horse is not available new at any price.

 

[jspringator]

Re: Rib/Sib specific motor applications.

Found the source if my intermittant start problems. The choke was sticking. I used a dri-slide hypo oiler to lube the piviot shaft, and then sprayed it with PB Blaster. I think I just need to keep an eye on it.

I pulled the rope through the hole about 5 inches to get the timing right on the existing rope and handle. I will probably wait until next summer to put the new rope on it. I may just put on the new handle. It's been so long since I pulled it I can't tell if it was easier or not. Started good and idled good in the garbage can. I may take it fishing tomorrow. I think it will smooth out if it is run hard.

 

[lester]

Re: Rib/Sib specific motor applications.

Worth a shot. You still considering the 15?

 

[jspringator]

Re: Rib/Sib specific motor applications.

I'm trying to resist. I'm going to Bradenton Beach over Christmas, and there is a Yamaha dealer who lists on e-bay at St.Petersburg Beach, which is just a few miles away. We'll see how much will power I have.

 

[lester]

Re: Rib/Sib specific motor applications.

Skip the trip to St. Petersburg Beach if you are in question. Something about seeing those shiny new models is way too tempting....especially if the dealer is offering year-end specials. Best of luck.

 

[jspringator]

Re: Rib/Sib specific motor applications.

I'm thinking about just taking my 6 hp Johnson. Lighter, easier to start, stone cold reliable. I'm going to retract the wheels and pull it out each day so the weight would make that easier. The only thing I would have to do is put a fin on it.

 

[lester]

Re: Rib/Sib specific motor applications.

Can the 6 get you on a plane?

 

[jspringator]

Re: Rib/Sib specific motor applications.

I don't know. It planed my Portabote, which was heaver, without a fin. Tohatsu Guru thought it would go 12 mph. I really ought to give my 25 another chance. I think I would be OK if I used my left arm to start it. I always forget to switch arms when starting time comes. It doesn't hurt until the next day! I badly dislocated my right arm in a car wreck in 1983, and I'm sure that is the root of the problem. I degreased it and used my dri slide hypo oilier in all metal to metal surfaces, including the choke mechanism.

 

[Sea Rider]

Re: Rib/Sib specific motor applications.

Worth a shot. You still considering the 15?

Go for a portable 2 strokes Tohatsu 9.8 HP if still available to buy, just 26 Kg. Compact & reliable, low cost to maintain.

Happy Boating

 

[jspringator]

Re: Rib/Sib specific motor applications.

Go for a portable 2 strokes Tohatsu 9.8 HP if still available to buy, just 26 Kg. Compact & reliable, low cost to maintain.

Hmmm... Interesting. Almost same weight and probably twice the power as my 1975 6. Available on Craigslist and e-bay.

Speed estimate in 12' inflatable with 2 people? I'd say 18 or so.

 

[lester]

Re: Rib/Sib specific motor applications.

Those Tohatsu 9.8's are very light. I would be willing to bet you could swap out the stock carb for a 15...ususally companies' 10hp and 15 are identical aside from the carbs and delivery systems.

 

[jspringator]

Re: Rib/Sib specific motor applications.

My reasearch shows that a 9.9 Tohatsu is an upgraded 8 rather than a detuned 15; hence the weight. NADA has a higher weight on an 88 than the 99, which either is a missprint or indicative of the time frame when the 9.9 went from being based on 15 to the 8.

EDIT: Further research shows the change was between 96 and 97 model year.

 

[Sea Rider]

Re: Rib/Sib specific motor applications.

My reasearch shows that a 9.9 Tohatsu is an upgraded 8 rather than a detuned 15; hence the weight. NADA has a higher weight on an 88 than the 99, which either is a missprint or indicative of the time frame when the 9.9 went from being based on 15 to the 8.

EDIT: Further research shows the change was between 96 and 97 model year.

Probably old models, new ones are completely different, 8 and 9.8 are 170CC engines, 9.9/15 are 250 CC engines, both, 2 cylinder engines that share same weight in same category. People often confuses 9.8 & 9.9 (10 HP in some countries) model engines as numbers are very close to each other.

Bottom line: more power = more? timming (which means more CCW throttle movement) and bigger carb jets to upgrade for next model same weight.

Happy Boating