I don't know how to do it, but I know Extreme marine in southampton do them. The difference between the 2 motors is the carb gasket, and the timing at WOT. The gasket on the 25 is slightly smaller. You can either buy the 30 hp replacement gasket, or if the old one is still in good condition, you can cut it. The timing is advanced by 5 degrees. Attached is the timing, if you need i can also put up a picture of what the new gasket looks like compared to the old.
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NEW ELECTRIC STARTER CONVERSION KIT FITS NISSAN / TOHATSU 25HP 30HP ENGINES
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For additional information, see the Global Shipping Program terms and conditions - opens in a new window or tab. Bank deposit.Remember Me? User Tag List. Results 1 to 10 of Thread: Convert Mercury 25hp to a 30hp. Thread Tools Show Printable Version. How do you convert it to a Mercuy30hp. Where can I get a stainless steel prop for this new motor.
OK, up to my 02, i don't think that you could increase the HP to this extent BUT i've seen miracles happen every days laugh As for the prop, i believe that your dealer could set you up OR the trade and Sale on this forum could be an option One way would be to go through the parts manuals and see what's different.
Same bore and stroke, so the short block is likely the same. Could be porting, valves, camshafts, all of the above. Originally Posted by tscimemi. I just bought the Mercury 25hp outboard with batteryless EFI. My best advice: leave that motor alone. Originally Posted by Scream And Fly.
increasing 25hp tohatsu to 30hp?
The Two motors are the same. The only difference is a spacer infront of the carby which limits air flow. Go to a Mercury dealer and get it taken off and swapped for a 30hp spacer. I have had two of those motors and trust me 5hp makes a big difference.
Does it void the warranty? Doubt you can make it a 30hp The 25EFI Mercury Tohatsu is a digitally fuel injected 4-stroke and you would need to have the computer changed to make it a 30hp The 30hp Mercury Tohatsu computer would cost you more than just selling your motor and buying a 30hp I plan on doing this to the head soon see if i can gain 2 more mph.
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A full refund include shipping fee ONLY available for unshipped order. Refund will be authorized after we receive the return goods and completely check there are no damaged, missing parts, or have obvious signs of use for reasons not due to seller error. No refund and replacement is issued after this period. It is the buyer's right to verify the fitment for the engine before purchase. Do drop us a message if there is any question, we will do our best to help and reach customer expectation. Marine Parts.Thanks Chatts for providing the missing pic, the engine was identified as a disguised Tohatsu brand, was in doubt if it was a rebadged Yamaha or Tohatsu 25, 2 strokes engine.
Here is the complete procedure.
Put carb back, adjust nuts. You'll screw it. Buy, change HP rear cowl decals if required by law to do so. Happy Boating. Attached Thumbnails. Just trying to change the timing to 25 degrees but cant seem to get more than 20 by moving screw.
Spoke to a technician at a local dealer who said that to change you must adjust rod 4 in picture 4. Is this correct? Many thanks. Anyone else done this? I get stuck at the part adjusting the throttle linkage. Which nut is it that is mean't to be adjusted to open up the throttle a little to the 25 mark? BB code is On. Smilies are On.
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NEW ELECTRIC STARTER CONVERSION KIT FITS NISSAN / TOHATSU 25HP 30HP ENGINES
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Tohatsu 25hp to 30hp? Gday Can anyone tell me what has to be changed to convert a 25hp tohatsu to a 30hp. Looks like there is a restriction plate behind the carby that can be removed. Is there any other mods that have to be done. Any help would be grately appreciated wamjam. Re: Tohatsu 25hp to 30hp? Things to check may be carbie bore, exhaust tuner, inlet and or exhaust restrictors and of coarse middle and upper jetting, also might need a retime to suit the differing higher rev range.
Good luck it usually doesn't end well these mods but the Tohatsu may be a different animal? Have you heard they convert well? Gday nq Had a look at the specs and they are identical eccept for the rev range. The 25 is to and the 30 is to and I have heard that you have to remove the restrictor behind the carby and change the timing. Don't understand the loss of revs for horsepower but thats what the specs read. Apparently the 30hp light weight merc is a 30hp tohatsu. I just don't know. Scott wamjam.
Thats good news if a person wanted a robust and torquey 25hp also good news for the 30 as well. I really am guessing here but the rev ranges hint at only restrictors it may even run identical carby bore and jets etc I would try and check out the 2 engines carby kits and standard jetting. I would also check just how different the timing is on both also and consider doing that as well before any WOT runs.
If you got it sorted minus the plates or whatever is the real deal and propped it to spin high in it's range like to you might be making near 35 hp Good luck let us know how you go.
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