tohatsu 3.5 won't run without choking - Page 4 - SailNet Community
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post #31 of 65 Old 08-24-2009
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3.5hp

is this siimilar to evinrude 3.3?
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post #32 of 65 Old 12-25-2011
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Resurrected thread. Found that new carb for 4hp Tohatsu is $108. Rebuild about 40-50. I haven't heard anybody point out that the Tohatsu/Nissan is almost impossible to throughly clean. The choke butterfly, carb intake butterfly linkage and choke linkage are plastic and I have not been able to remove them from the carb body prior to soaking the carb in cleaner (and I'm not sure it won't melt in carb cleaner). Factory manual is weakly written for 'how to' but does give assembly order and specifications. The idle jet is under a brass plug and can be difficult to remove. The main jet often corrodes in its' threads and the brass screwdriver slot can give way before the jet releases. If. any reader has solutions to the above I'd sure like to hear them. I hate to replace the carb every few years and fortunately I've just found a source for alcohol free gasoline a couple of blocks from my house which may extend the time between cleanings.
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post #33 of 65 Old 12-26-2011
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Difference btw M3.5B and MFS4

Diamond,

The OP was talking about the old 3.5B, with slide type throttle. Yours is an entirely different animal. We clean them all the time (few a week) in my shop. Must be done in carb dip. Period. Better yet, if your carb was abused by letting gas sit in it too long... for your MFS4... would be to install a new carb for the MFS6B (identical powerheads), and clean up the old carb as a spare. 50% more hp, too. We do it all the time.

Paul Van Voorhees
Certified Tohatsu TLDI Technician
Mgr, Obersheimer Sails
Buffalo, NY USA
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post #34 of 65 Old 12-26-2011
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pvan1.....do you remove the plastic parts prior to carb dip? I found the manual did not refer to this and the plastic parts don't just 'pop' off. The choke butterfly appears to be press fit in a slot on the intake side and the levers for both throttle and choke are apparently press fit on pins. Is that the way it is??
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post #35 of 65 Old 12-26-2011
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GREETINGS EARTHLINGS sounds like your treating the symtoms and not the curse it must need an extra fuel fillter if there is space for it GO SAFE
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post #36 of 65 Old 12-26-2011
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I'll replace fuel filter and try it. Idling is poor on both my '05 Nissan 4hp and 2001 Tohatsu 5hp. Nissan just got the carb and new fuel filter. Tohatsu in my shop now. BTW...............How important is ethanol free gasoline?
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post #37 of 65 Old 12-26-2011
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GREETINGS EARTHLINGS Always let your fuel sit for a while before you put it in the tank too let the water seperate then fillter then place in fuel tank GO SAFE
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post #38 of 65 Old 12-26-2011
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Can't buy ethanol free gas around here that I know of. Captflood, what do you do with the water at the bottom of the gas can if it separates out? Isn't it part gas part water?

Burn pile??
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post #39 of 65 Old 12-26-2011
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Quote:
Originally Posted by skygazer View Post
Can't buy ethanol free gas around here that I know of. Captflood, what do you do with the water at the bottom of the gas can if it separates out? Isn't it part gas part water?

Burn pile??
Berryman's B-12 fuel additive "absorbes" the water and it goes out the exhaust. No affiliation, it just works for me for many years, no fuel related problems during that time. Suggest reading the instructions, it can melt paint and some plastics, good stuff!!, they will probably ban it in California soon, it works that well.

Dabnis
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post #40 of 65 Old 12-27-2011
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GREETINGS EARTHLINGS. Any leftover deposits or fluids that are unwanted and are in need of dissposal I normaly feed to the weeds in my drive (Dandylions Mainly), Or go into a bottle used to wash-down engine bits, GO SAFE
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