Man on a mission - need input !!!!

[lovinnitro]

Alright gang,

Our friend the Waterzub and I are getting together Sunday to see if we can work out the miss bud problem he has. I want to see our friend smiling like so.............:D and know I have missed some post regarding his motor so I'm looking for any suggestions.
It seems to run fine when on the bench but dies when it gets a load put on it. Last I heard after retrieval there was fuel in the pipe.

I'm guessing still running too rich or has a carby problem. Will the carb off of my TT Pro .21 work on his .15? I,m just trying to look at any and all possiblities. I've talked to him plenty and it sounds as if he has it all right but I still haven't seen the boat.

Thanks for whatever input you may have gang. I'm hoping come Monday you will hear stories of a flying miss bud from Kirt.

[Spraguepsycho1]

I don't know if the .21 carb would work on a .15 engine or not, it may physically go onto the engine, but if the carb is internally larger, you would lose intake velocity and kill what little bottom end power the .15 already has. I'm almost willing to bet once you start messing with the needles a little bit, you'll get it going fine. I'm wondering since it seems to run ok with no load on it, if it's rich on the high speed needle (would explain the excess fuel in the pipe) but lean on the low needle (stalling once the load is on it). But I may be wrong, I'm far from being a nitro tuning expert. Good luck and have fun. :D

[Doubledog]

May the Force be with you !

[bugfanatic]

Spraguepsycho1, that was exactly my guess. He emailed me once & that's exactly what I said. Sure seems to be, doesn't it?

[lovinnitro]

ok sounds fair to me. where should I set the needles at then high speed 3 out to start and I thought I saw Bug say 1 out on the low is that right?

Hehehehe I shall not fail !

Also, Primary (large needle) is the high speed and the mixture metering valve is considered the low needle yes/no? I can have Waterzub bring his manual as well.
Thanks for help fellas!

[Spraguepsycho1]

I'm not sure about the engine he has, but the book for my nw OS CVR 15 said 2 turns out on the high speed needle from closed, and the for the fuel mixture screw(low needle) start with the head flush with the outer surface (assuming the collar around it) then screw in 2 1/2 turns. Those were factory settings for initial tank for break in, then turning the high speed screw in 30 degrees after each tank for 5 tanks before final adjustment. The final settings were continue turning in 30 degrees, testing at full throttle until it starts losing smoke or losing speed, then open 30 degrees again. Final for the low needle was

"let idle for 5 seconds then reopen throttle fully. If,at this point,the engine puffs out an excessive amount of smoke and the vehicle doesn't accelerate smoothly and rapidly, it is probable that the idling mixture is to rich. In this case, turn the mixture control valve clockwise 45-90 degrees. If on the other hand the engine tends to speed up momentarily and then cuts out abruptly when the throttle is opened,the idling mixture is too lean. Correct this by turning the mixture control valve counter clockwise 45-90 degrees."

it also states adjustments have to be made and tested under load to be acurate. maybe some of this will help. From what I gathered reading the OS manual, they state if it boggs but keeps running the idle mixture is too rich (which sounds like the problem on Ms Bud), if it just dies when you hit the throttle it's too lean.

[Spraguepsycho1]

P.S. yes the high speed needle is the big one usually up top where the fuel line comes in, low speed /idle mixture screw is the one that goes in thru the center of the carb (thru the rotor on the rotory valve carbs).

[lovinnitro]

Thanks,
That's what I thought but Waterzub has so much time into his bud it's not even funny. So I want to try to cover all the bases. He's smart tho so I know he already did a bunch of setting testing but I figure it's the best place to start. How much are airplane props and what size would I need to create enough drag to simulate water? might be a good way to break in my Pro .21 as well and at least we may save us some casting time!:D
We already have that covered as well. If nothing else we'll get to shoot the breeze, have some BBQ, and a couple of Captians :rolleyes:

[Spraguepsycho1]

a Top Flite 8x4 propellor should work fine for breaking in either engine, it's the largest recommended for a .10, and smallest recommended for a .25. Tower sells them for $1.69, so your lhs should have something that will work for under $3. I think I was running a 7x4 on an old control line plane I had with a weak OS .20, anyways since you are just using it for resistance, not lifting a plane off the ground, the 8x4 should work ok I think.

[FlyerCAN]

but so can a bit of dirt clogging the fuel in the carb. I've never taken apart one of those carbs on a nitro, but it is possible... no? It is what was causing my boat to die, even though it is gas. Its still an engine and has all the basic properties between them. No matter what, dirt clogs carbs, unless filtered well.

[Spraguepsycho1]

with how simple a nitro carb seems to be, I'd imagine if it did get dirt partially blocking the fuel passages inside, fixing it would be easy . just pull the needles out and cover the carb with your hand(to aviod nitro in the eyes) while blowing compressed air thru where the fuel line goes in.

[lovinnitro]

Heck tho',
It shouldn't even have had a chance to get dirty> This boat is brand spankin man.
Anywhose, tomorrow is the day and by 'jimmini, we'll get it or get fat and have a couple while trying. :D

[Spraguepsycho1]

So tell us, how'd it go??? Is Miss Bud now a guided missile, or a stationary bouy? lol

[Doubledog]

:rolleyes:

Waiting...... (lol)

[Spraguepsycho1]

we'll get it or get fat and have a couple while trying.

Maybe they're having trouble reaching the keyboards??? lol:D

[riche]

I may be late on this one but I would change the plug for good measure and start at 4 turns out and work down a 1/4 of a turn at a time till it planes. run it for a while at plane bring it in and tweak some more.... It should stay running at 4 turns but not plane...just kind of plow thought the water like a tug boat.

p.s. when first start and the engine is running there should be a good bit of bog in the throttle with no load. If it raps up easy then it is way to lean....

Hope yall got it!!!!!:D