2019 Grizzly Tohatsu 20 short shaft

[fyr4efect]

First I want to thank all here who responded to my help requests. Saved me a lot with my learning curve.
Hung the engine yesterday using a 1 ton Walmart chain hoist. 40.00. Works great. Started immediately. Very quiet, will be more quite in the water with prop exhaust.
The cav plate sits 1 1/2" above the bottom of the transom. Talked to a guy who has the same boat and engine and he says no cavitation. Says he gets 25mph WOT. I'm taking it out tomorrow so we will see. I have a tiny tach but haven't decided where to mount yet. Both batteries are mounted in front hatch. BTW got the engine from Online Outboards. Great to deal with. Gave a Military discount.
I'll post after the test run. Cheers

 

[wmk0002]

Nice rig!

 

[Weldorthemagnificent]

Congrats. That should be a great fishing rig. Those 20 tohatsu motors are over achievers. Should perform great.


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[gatorglenn]

Yes nice rig for sure.
Only thing I suggest, is your transducer is angled to low. Once you pull the boat out of the water. And see the scam line, ( how the boat is leveled in the water) you can rise the end upward. So it’s level in the water. This makes a huge difference in performance.

This is a pic of mine. Looks odd, but I have a lot of rear weight. There are UTUBE videos on how to use levels to gain the correct set position. But hey the scam line doesn’t lie [emoji6]


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[fyr4efect]

First I want to thank all here who responded to my help requests. Saved me a lot with my learning curve.
Hung the engine yesterday using a 1 ton Walmart chain hoist. 40.00. Works great. Started immediately. Very quiet, will be more quite in the water with prop exhaust.
The cav plate sits 1 1/2" above the bottom of the transom. Talked to a guy who has the same boat and engine and he says no cavitation. Says he gets 25mph WOT. I'm taking it out tomorrow so we will see. I have a tiny tach but haven't decided where to mount yet. Both batteries are mounted in front hatch. BTW got the engine from Online Outboards. Great to deal with. Gave a Military discount.
I'll post after the test run. Cheers

Ok, I didn't wait. Took it out today. I hooked up the tin tach. Wound 3-4 times around the plug but it showed 3000 rpm at WOT. GPS showed 25mph. I think I didn't put it on right. The motor does cavitate slightly. I get alittle spray back at the transom. Looks like its coming from the anti cave plate. I can adjust the "tilt" up while running but not down. Didn't seem to make much diff with the spay. I read somewhere for a fix for this but I forgot what they did. Recommendations?
Gets up on plane very easy. Transducer was working fine and didn't loose display at 25mph. I will adjust it like Gatorglenn mentioned to see if any diff.
All and all I am satisfied with my decision to go with the 20hp on this boat. The engine came with a 9.25 x 11.5 prop. Any advise welcome.

 

[fyr4efect]

Nice rig!

Thx

 

[gatorglenn]

If you can get a good rpm reading. And it’s still 3000 I would go to a 10p. It’s a heavy boat for its size.


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[jasper60103]

First I want to thank all here who responded to my help requests. Saved me a lot with my learning curve.
Hung the engine yesterday using a 1 ton Walmart chain hoist. 40.00. Works great. Started immediately. Very quiet, will be more quite in the water with prop exhaust.
The cav plate sits 1 1/2" above the bottom of the transom. Talked to a guy who has the same boat and engine and he says no cavitation. Says he gets 25mph WOT. I'm taking it out tomorrow so we will see. I have a tiny tach but haven't decided where to mount yet. Both batteries are mounted in front hatch. BTW got the engine from Online Outboards. Great to deal with. Gave a Military discount.
I'll post after the test run. Cheers

Ok, I didn't wait. Took it out today. I hooked up the tin tach. Wound 3-4 times around the plug but it showed 3000 rpm at WOT. GPS showed 25mph. I think I didn't put it on right. The motor does cavitate slightly. I get alittle spray back at the transom. Looks like its coming from the anti cave plate. I can adjust the "tilt" up while running but not down. Didn't seem to make much diff with the spay. I read somewhere for a fix for this but I forgot what they did. Recommendations?
Gets up on plane very easy. Transducer was working fine and didn't loose display at 25mph. I will adjust it like Gatorglenn mentioned to see if any diff.
All and all I am satisfied with my decision to go with the 20hp on this boat. The engine came with a 9.25 x 11.5 prop. Any advise welcome.

Nice. I like how my grizzly rides on the water. I still need to mount a driver's seat off-center like yours.
Just curious, what did the tach read at idle? I'm wondering if its setup right.
That 20 should troll nicely. Enjoy the new rig. =D>

 

[fyr4efect]

First I want to thank all here who responded to my help requests. Saved me a lot with my learning curve.
Hung the engine yesterday using a 1 ton Walmart chain hoist. 40.00. Works great. Started immediately. Very quiet, will be more quite in the water with prop exhaust.
The cav plate sits 1 1/2" above the bottom of the transom. Talked to a guy who has the same boat and engine and he says no cavitation. Says he gets 25mph WOT. I'm taking it out tomorrow so we will see. I have a tiny tach but haven't decided where to mount yet. Both batteries are mounted in front hatch. BTW got the engine from Online Outboards. Great to deal with. Gave a Military discount.
I'll post after the test run. Cheers

Ok, I didn't wait. Took it out today. I hooked up the tin tach. Wound 3-4 times around the plug but it showed 3000 rpm at WOT. GPS showed 25mph. I think I didn't put it on right. The motor does cavitate slightly. I get alittle spray back at the transom. Looks like its coming from the anti cave plate. I can adjust the "tilt" up while running but not down. Didn't seem to make much diff with the spay. I read somewhere for a fix for this but I forgot what they did. Recommendations?
Gets up on plane very easy. Transducer was working fine and didn't loose display at 25mph. I will adjust it like Gatorglenn mentioned to see if any diff.
All and all I am satisfied with my decision to go with the 20hp on this boat. The engine came with a 9.25 x 11.5 prop. Any advise welcome.

Nice. I like how my grizzly rides on the water. I still need to mount a driver's seat off-center like yours.
Just curious, what did the tach read at idle? I'm wondering if its setup right.
That 20 should troll nicely. Enjoy the new rig. =D>

I wound 3x around 1 spark plug right up to the cap. Then I attached the white wire to a engine ground. At idle I think it was 600. I'm going mess with it today. Maybe 2x around. Im more annoyed with the spray. I cant lower the engine. I still have my mini-jacker that didn't fit the Merc 25 LS, but it will fit this 20 as the mounting holes are 8" apart and the jacker plate is 11" I thought if I keep it the same height but 4" offset it might solve my cav problem. I'm not sure a hydrofoil is an answer. I am very new to this but I am not opposed to experiment. The 14 grizz moves out pretty good with the 20 and handles well. Thx for your input.

 

[GYPSY400]

The tach might be set on 2 stroke

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[jasper60103]

Nice. I like how my grizzly rides on the water. I still need to mount a driver's seat off-center like yours.
Just curious, what did the tach read at idle? I'm wondering if its setup right.
That 20 should troll nicely. Enjoy the new rig. =D>

I wound 3x around 1 spark plug right up to the cap. Then I attached the white wire to a engine ground. At idle I think it was 600. I'm going mess with it today. Maybe 2x around. Im more annoyed with the spray. I cant lower the engine. I still have my mini-jacker that didn't fit the Merc 25 LS, but it will fit this 20 as the mounting holes are 8" apart and the jacker plate is 11" I thought if I keep it the same height but 4" offset it might solve my cav problem. I'm not sure a hydrofoil is an answer. I am very new to this but I am not opposed to experiment. The 14 grizz moves out pretty good with the 20 and handles well. Thx for your input.

The idle RPM sounds fine, so I would assume the tach is setup correctly.
I don't know the WOT range off hand, but 3000 RPM sounds too low to me, but 25 MPH sounds great.
I guess its just over propped like someone else mentioned? #-o
I'm sure you'll get it figured out. I'm still getting familiar my setup and I've
been on the water 4 or 5 times. :LOL2:

-jasper

 

[fyr4efect]

The tach might be set on 2 stroke

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You could be correct. The Tinytach 2AM I have is for outboards [ except Honda ] I spoke to TinyTach and he didn't ask 2 or 4 stroke. The instructions doesn't ask if your engine is 2 or 4. It just says wire around a plug wire. He said try wiring to both cylinder plug wires as it might be picking one input instead of two.So we will see. That 3000rpms Im getting is half what WOT should be for this 20 hp. 5400-6100.

Ok after hooking on both wires the idle is 1000 rpm, on one it was 500-575. So looks solved. Ill water test it Mon.

Thx for your input.

 

[gatorglenn]

Tiny techs have been around for ever. Used on mostly 4 stoked motors. Lawnmower, generators. All sort of things. But the biggest thing I found over the years is, putting one wire only on the number 1 cylinder, as directions say. Your idle rpms should be between 750-900 when the motor is fully warmed up.


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[fyr4efect]

Tiny techs have been around for ever. Used on mostly 4 stoked motors. Lawnmower, generators. All sort of things. But the biggest thing I found over the years is, putting one wire only on the number 1 cylinder, as directions say. Your idle rpms should be between 750-900 when the motor is fully warmed up.


My directions don't mention #1 cylinder, neither did the factory guy. Thx for your input.

 

[gatorglenn]

Well ok, they must have changed. All 3 I’ve bought (some time ago) all said to. Go luck and it’s a really good looking rig


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[fyr4efect]

Well ok, they must have changed. All 3 I’ve bought (some time ago) all said to. Go luck and it’s a really good looking rig

Thx,

my next challenge is to solve the back spray Im getting from the cav plate, currently sitting 1 1/2" above the bottom transom.
.

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[fyr4efect]

Yes nice rig for sure.
Only thing I suggest, is your transducer is angled to low. Once you pull the boat out of the water. And see the scam line, ( how the boat is leveled in the water) you can rise the end upward. So it’s level in the water. This makes a huge difference in performance.

This is a pic of mine. Looks odd, but I have a lot of rear weight. There are UTUBE videos on how to use levels to gain the correct set position. But hey the scam line doesn’t lie [emoji6]

What kind of Jack Plate are you using and why?
Thx


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[nytebyte]

I have a 2018 20 hp Tahatsu and I belive the idle rpm is 950? Top rpm if propped right is 5800 to 6000. I haven't looked in the owners book lately and just going from memory but pretty sure on the idle rpm. I wanted to slow mine down a bit for trolling and found that with the efi I couldn't do it.

 

[fyr4efect]

I have a 2018 20 hp Tahatsu and I belive the idle rpm is 950? Top rpm if propped right is 5800 to 6000. I haven't looked in the owners book lately and just going from memory but pretty sure on the idle rpm. I wanted to slow mine down a bit for trolling and found that with the efi I couldn't do it.

I just started it up and let it warm up this am. It was at 950. Book says 950 idle, 5400-6100
Taking it out tomorrow to ck what it reads at WOT.
What boat do you have your 20 on?

 

[nytebyte]

Mine is on a 14 ft Lund Fisherman. Top speed is around 23 gps with me and my Lab but it is pretty heavily loaded.