Wacker engine mount question please.
 

Hi guys,
I'd be very grateful if someone could tell me what the rectangular (obround?) cut-out in the side of my Wacker Engines Ryobi mount is for? Basically, I'm just about to attach the mount to my firewall and I need to know which way up it should go ;) The Ryobi will be mounted inverted - exhaust pinting downwards - by the way.

Many thanks!
Steve

RE: Wacker engine mount question please.
 

I could be wrong but Im sure if you check with Peter at Wacker he will tell you its for throttle linkage acess. Everytime I have called him he has had the time to talk with me and is a very nice person as well.

RE: Wacker engine mount question please.
 

This should give you an idea. Found a used rowing machine frame that wanted to go flying!

RE: Wacker engine mount question please.
 

Hi guys,
Thanks for the replies... and yup, you're right, it's for the throttle access &/or movement. What threw me is that on the 'big bore' 473(?) carb I got from Peter it has a real long choke arm that points in the complete opposite direction to the throttle so the hole in the mount could've been for that if you turn it thro 180 :eek: Peter says to junk the choke anyway :D another 1/4oz lighter![sm=thumbup.gif]
Steve

RE: Wacker engine mount question please.
 

you might want to check the throttle linkage clearance to the front inside wall of the mount. I needed an indentation for linkage to go to full. You could always drill a hole on the other side for the choke arm access. Seem I read somewhere that some Walbro chokes have an extra fuel channel that opens when carb is closed and a detent for a ball. Check the model diagram at : http://wem.walbro.com/walbro/family2.asp

RE: Wacker engine mount question please.
 

Don't go junking the choke just yet. It is very useful for choking and can even be used as an engine kill. A good friend of mine had a stuck throttle on his Patty Wagstaff and ended up tearing up the plane trying to land it with power on. Had he had a servo actuated choke, he could've killed the engine in flight.

Especially for the rear carb Ryobi, manual access to the carb throat for priming can be difficult. I doubt even TOC-class pilots can notice 1/4Oz difference.

RE: Wacker engine mount question please.
 

a stuck throttle is problem as Volfy described. Additionally, for the possibility of a throttle linkage coming loose, I retain the return spring, just take some of the tension off by letting loose end unwind abit to contact a different position on the carb body or remove throttle shaft and let it unwind 1 revolution and replace shaft.

RE: Wacker engine mount question please.
 

Thanks for the good advice gentlemen [sm=thumbup.gif]

Do you also advise soldering up the little 'nick' / groove in the brass carb butterfly so as to be able to totally shut off the throttle?

RE: Wacker engine mount question please.
 

Whether a nick, groove or hole, SI. Your throttle servo is going to control full closure.
Copy down that carb series/model number (two lines top corner , opposite side from the needles) (WT WA etc series) and below that the carb model. (beats big bore 473? for ID :D) when you need a replacement part, etc.

RE: Wacker engine mount question please.
 

Thanks Mike, will do [sm=thumbup.gif]