Hey all,

I am looking at installing a perry pump on my Moki 180 - It is not running quite as it should while in flight, after some aerobatics it has a tendency to nearly die, but then burst back into life. This unpredictability makes me nervous so I am wondering if a perry pump will solve this?
Can anyone shed some light on this and what it takes to install one? ie. i pressume the pump needs its own battery?

Cheers

R.J

I believe the perry pump you'd be looking at just requires crankcase pressure.

I have a moki 1.80 in a Dave Patrick Ultimate and it runs great without the aid of a pump. i run muffler pressure to the tank, that's about it. flying on an APC 18x8 prop.
If your Moki is new give it some time. Mine seemed to take some time to break in, but once it did it's been nothing but reliable.

Perhaps take a look at your tank and your clunk and make sure it's free to flop around inside the tank. Also make sure you don't have any pin holes in your fuel tubing, etc.

Hey thanks mate,

Yeah, it is still a long way from being run in, i will give it some time, cheers for the advice!!!

RJ

Hey nice Ultimate by the way!!

my moki 2.10 runs great on a perry pump, i have a tap on the crankcase that powers the pump. very simple installation.

If you pump ,get the VP30,I am pretty sure the VP20 is for 4 strokes.Just to avoid confusion.I use the 30 on an OS 160 2 stroke.Simple and reliable.

Hi!
I have 3 moki's on VP30 perry pumps, 2 x 1.80 and 1 x 2.10

You need to set them up in a specific way, which works every time for me.

First off, you must have a filter before the pump otherwise the pump will fail after a while.

When you set the pump up, start the engine with the HSN set rich, say 2 turns out.....then adjust the pump until the motor runs rich, this ensures the pump is delivering enough fuel.

with that done, you need to adjust the LSN until you get good transition, do this in very very small amounts as the LSN on mokis is very sensitive, you will need to move it towards the lean side (-).

Then with that done, adjust the HSN again, then go fly!!

Hope that makes sense.

For the record i use OS 'F' plugs, APC 18 x 8 on my 1.80 and APC 20 x 8 on my 2.10


Hope that makes sense?

Regards

W

PS: I forgot, these MOKI's need a lot of running in until you get full performance, at least 3 gallons

Thanks guys,

I think i will look at a pump in the future - but i think the wisest thing at this stage is to give t a decent run in period! then we'll take it from there!

RJ

I just acquired a Moki 1.80 with a Perry pump and a Bisson Pitts muffler thing runs great, transitions flawlessly. I was wondering if any of you guys knew why the fuel line coming off the fuel tank was not attached to the valve on the muffler but velcroed out of the bottom of the firewall? When I would fill the tank, the fuel would pour out of that same muffler line unless I put a stopper on it. Just a little confusing. I have had two Moki 2.10 in the past without pumps but they ran better than any other engine I've had. Thanks in advance for the help.

Mike

It is not to be attached to the muffler as it would pressurize the tank,not to be combined with pump pressure.Not sure why its leaking from there.It should just be a vent line.maybe fill it from that line and see if the other one is a vent?