Please help with this YS 61S????
08-29-2008, 07:24 AM
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Please help with this YS 61S????
I bought this engine and have a couple questions from you guys that know alot more than me. In the pic you see 2 nipples just below the carb and behind the prop. Which one is for pressure and which one is for supply, or how can I determine? Any suggestions on how to initially set up this beast to start tuning it. I will be running either a 12x8 or a 12x10. Any other info you might have or know will help as I have never had a pumped engine or an engine with a tuned pipe. I am only about a year into this hobby so I am still learning. Thanks in advance.
08-29-2008, 08:13 AM
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RE: Please help with this YS 61S????
I have a manual for your engine in PDF form if you want me to e-mail it to you.
First thing though, in your pictures I see two fuel filters but no check valve. You need a YS check valve for your engine to function properly. The YS fuel system is a pressurized system and not a pump per se. The check valve lets the pressure into the tank but won't let it escape back to the engine so the fuel will be fed to the engine under pressure. This is why you can put the tank just about anywhere and the engine doesn't care.
The front nipple is the fuel feed coming in from the clunk and the rear is the pressure line back to the tank vent tube and this is the one that should have the check valve in it. Make sure you have a YS check valve not any other type or you will run into issues.
First thing though, in your pictures I see two fuel filters but no check valve. You need a YS check valve for your engine to function properly. The YS fuel system is a pressurized system and not a pump per se. The check valve lets the pressure into the tank but won't let it escape back to the engine so the fuel will be fed to the engine under pressure. This is why you can put the tank just about anywhere and the engine doesn't care.
The front nipple is the fuel feed coming in from the clunk and the rear is the pressure line back to the tank vent tube and this is the one that should have the check valve in it. Make sure you have a YS check valve not any other type or you will run into issues.
08-29-2008, 08:17 AM
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RE: Please help with this YS 61S????
Rear = Return to tank - with check valve to pressurize tank
Front = Feed to engine - with filter
JPG attached (look like crud, converted from the manual PDF)
I can send you the PDF if needed.
YS60 and YS61 engine plumbing was the same.
The rest of the setup depends somewhat on the pipe you will be using.
My YS long stroke was set up with a Hatori 650 pipe. Set was 16.5" from the exhaust outlet to the first baffle.
You may want to stop over in the Classic Pattern forum for this engine too. Lots of us old YS users over there.
Front = Feed to engine - with filter
JPG attached (look like crud, converted from the manual PDF)
I can send you the PDF if needed.
YS60 and YS61 engine plumbing was the same.
The rest of the setup depends somewhat on the pipe you will be using.
My YS long stroke was set up with a Hatori 650 pipe. Set was 16.5" from the exhaust outlet to the first baffle.
You may want to stop over in the Classic Pattern forum for this engine too. Lots of us old YS users over there.
08-30-2008, 07:05 AM
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RE: Please help with this YS 61S????
Please email it to me, mu email is [email protected] this will be a great help. I have the check valve, i just didn't have on there in the pic, but I didnt know where it went, thanks Cliff
