Honda GX610 engine issue

[jlasater 205]

So I'm working on repairing a project tractor for my dad. It was repowered with a Honda GX610 18HP v-twin engine. When I got it, the air box and various fasteners were missing. I thought I had it all back together with new parts sources from Jacks Small Engine, but I think I may be missing the carb insulator piece. What I'm seeing is that the air box base is too far back (towards the flywheel) for the two shoulder bolts to hold it to the flywheel cover, but the two flange bolts do bolt the air cleaner base down to the carb intake elbow. On the bottom of the air box base, there is a slot that appears designed to fit over a rubber grommet that sits in the top of the metal bracket holding the fuel pump. It seems like a natural fit, but now I'm wondering if that rubber grommet is supposed to sit behind the air box base because if I add the carb insulator, it won't line up. I can't seem to find any pictures of exactly how the air box bolts on and with what parts. Can you guys be of any help? If you happen to have a GX610, have any pictures of the carb area handy?

Airbox base is inverted in this picture. You can see the rectangular pocket that seems to fit over the fuel pump bracket grommet.

 

Note the offset on the air box base to the left, hanging over the flywheel cover.

 

While this isn't in a Simplicity tractor, the questions I have apply to a Honda engine in any application. Just trying to get another project out of the shop and on its way to my dad.

[jlasater 205]

Here is what I have for the carb install. From the looks of the amount of threads showing on the two bolts, I'd say something is missing. The engine speed also "hunts" very consistently which I suppose could be attributed to a missing spacer which would also throw off the governor calibration.

[Angry Bear 90]

Looks to me like you are missing #17. 

[jlasater 205]

I think so too, but I can't verify that the fuel pump bracket is supposed to stick into the pocket on the end of the air box base. I vaguely recall seeing pictures of it on the outside, but it sure seems odd Honda would have that sticking out of the cover...just doesn't look right.