Cheap Friction Drive.

[Cannonball3]

Another update on the build. The twin fuel tank set up works great. The top tank self feeds as I hoped it would. The
bottom tank remains completely full until the top tank is empty.

 

[Chainlube]

Question to you folks running these style engines. How does the engine intake cooling air? The fan is on the clutch side, and I assume pulls air thru the clutch area? It blows air out the vents on the recoil side (crossflow). Shouldnt there
be vents like the housing in the pic? Bolted to a gearbox or a friction drive it looks like the air flow would be greatly reduced.

The fan is on the pull start side, takes air in through the vents, pushes it out over the coil and cylinder head.

Check the manual:
file:///C:/Users/vicha/Downloads/Honda%20GXH50%20Parts.pdf

 

[Chainlube]

The fan is on the pull start side, takes air in through the vents, pushes it out over the coil and cylinder head.

Check the manual:
file:///C:/Users/vicha/Downloads/Honda%20GXH50%20Parts.pdf

Use this link

Honda GX25/GX35/GXH50 Owners Manual

in PDF form. These are similar to GX22/GX31 engines.

motoredbikes.com

 

[Cannonball3]

Deja vu. I believe we discussed this earlier in the thread. I didnt realize it at the time but there are air intakes
on the pto side where the flywheel fan is. The fan on the start side is to cool the oil sump. Flywheel blows it from the pto side up and over the block/head and out the vent over the starter. Heres a pic of a block. Its just about impossible
to get a pic on my engine with the fuel tank on. Heres the flywheel/cooling fan. 31 and 50 basically the same.

The large holes in the flywheel area are the cooling intakes.

 

[Cannonball3]

Pic of the small starter side sump cooling fan.

 

[Cannonball3]

Just to wrap this up I pulled my spare GX31 down, small fan cools the finned oil sump big pto side fan cool the cylinder/head

 

[GW's Motorized]

If I'm not mistaken people will drill the PTO cover so it pulls in air better

 

[Cannonball3]

I drilled some extra holes in the clutch cover hopefully to cool the clutch a bit. The fan should draw thru there
as well.