Walbro pulse pipe installation

[Kit]

Hi Fellas

Planning on fitting my walbro over Christmas, which will need the crankcase drilling for the pulse pipe. I have brought an M6 to 4mm barbed hose fitting to fit, to take the pipe. Has anyone done this, and do you have any wise words for me before I wade in?

I feel that I know more or less what I need to achieve, not sure of the best way of going about it; I'm worried about drill swath ending up in the crankcase, etc, if I don't strip it right down. Some say that you can fit a pipe without removing the engine at all? Many thanks, Kit.

 

[HeadSmess]

use gravity assist? drill right at the bottom of crankcase, set at bdc, remove spark plug and flush any shavings with petrol...(block the exhaust too) doesnt have to be on a transfer, just somewhere into the case... tis what i would do.

or pop the top end and vac out the swarth as i drill...

 

[Fabian]

Go here for a comprehensive photo tutorial on installing a Walbro style diaphragm carburettor.

I cleaned the inside face of the transfer tunnel with mineral turpentine, followed by alcohol to remove any turpentine residue, thereby allowing a couple of layers of PVC Duct Tape to securely stick to the inner transfer tunnel wall; preventing twist drill shavings from dropping into the crankcase.
The metal shavings stick to the PVC adhesive, and can be carefully removed.once you have broken through the tunnel wall.