Thai Longtail/mudmotor With 6hp Lifan/honda

[riverrat87]

Hey guys, I'm attempting to follow in yalls footsteps with a 6.75 briggs off of a pressure washer and I'm not sure how to figure out what sprockets I need for the right gear reduction. Any ideas? Thanks in advance.

[thudpucker]

Keep the B&S running at 3600 Rpm.
Now you need to know the prop Pitch, and Diameter.
Then you get the info on the load that will create.
Then Gear the engine to the Prop using percentages.
Then convert the percentages so Sprocket sizes.

[pistnbroke]

anything around 2 to 3 to one seems ok depends what prop you have to hand you could try to match it . .I think my big cog is 28 teeth small one 12 ..if you go much bigger in teeth the large cog gets physically quite big . If you can do a double chain its even better. I think Mc Master Carr have a selection of cogs mail order

You can get b and s with reduction gearbox attached

[riverrat87]

I haven't got a prop yet, should I go with a three blade or two blade

[rmenasco]

Pistnbroke,

I have really been looking around a lot on the internet and I found a company over here in the states that is commercially selling the same thing that you have built for around 1000.00USD

Here is there site....

http://www.scavengerbackwater.com/