Hey Dave,

I've recently acquired a slightly used 91FZ and have mounted it inverted on my new U-Can-Do. I'm working through some setup issues with a couple of folks familiar with YS at the field - but I have a question for you:

While sitting still (i.e. not running), the engine will slowly leak fuel out of the carb. What gives? As far as I can tell, it only leaks after I have recently run it... it leaks, I wipe it away, it leaks some more, I wipe it away... I can watch is slowly accumulate and start to drip. It ends up making a fair sized mess under the plane. Then, some time after I've run it... it stops leaking.

Is there a gasket that can't take the pressure? Or is this a result of running the engine inverted?

I've only had it to full throttle about 3 times, but MAN does this thing ROCK! I look forward to getting it running reliably and in the air... I can't believe how much more power this thing has than my OS 91.

You've got to release the pressure from the fuel system after you run the engine.

Small drips from the carb are fairly normal and are caused by the plunger not seating or being held open by a piece of crud. Make sure the regulator is clean.
Releasing the pressure is a band aid, but it does work.
Just for grins, screw the regulator screw in 1/2 turn and see if the engine still runs ok. If it does and it stops the drip, you are home free.

Dave

Thanks for the tips! The previous owner had the regulator a turn and a half proud of the body... I've set it flush and the leaking has slowed WAY down... Plus the engine is running great! I've run two tanks of fuel through it and it really sounds good.

Now if the weather would cooperate I'd take the UCD3D out for its maiden voyage!

I do have one other question... not sure if this is the correct place for it, but here goes: Can you recommend a good Tach? I have a Magnum Digital mini-Tach and it seems more like a random number generator than a tach! I'll have the engine full throttle and it'll read 1700 then I idle it and it reads 2300... and I have to put it so close to the spinning blade to get it to read something other than 000 that it worries me... I'd be grateful for any recommendations...

Thanks again.

Bobby R

Most of the tachs on the market are junk! I use an analog tach which is alot easier to deal with. They are hard to get and won't take any abuse because of the meter. Cost is close to $200, but worth it if you want accuracy. Of the digitals, the TNC is about the best, cost is around $100. Check the magazines for his ad.

Good Flying,
Dave

TNC is out of business. I even called him to see if he had any stock left, and he was out. The day after my tach crapped out..bummer.