RunRyder - TT90

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Engines Plugs Mufflers Fuel > TT90

Budgie
Senior Heliman
Location: England

Hi guys back again has anybody ever had an engine that will not cut out ?? the carb is fully closed so no air but the thing still runs and you cant shut it down apart from nipping the exhaust!!!!! not good any ideas would be great

http://budgieshelicopterclub.co.uk

02-08-2008 03:27 PM

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Lamar Cooley
Senior Heliman
Location: Houma,La.,U.S.A.

TT90

Budgie
I'll scratch my head with you.
Air,Fuel,Heat = Running
Plug exhaust = no air flow = no fuel flow.
Could there be wear on your carb. barrel ? Allowing just enough air
and fuel to maintain running ?
Fuel follows air so I would look for an air leak at the barrel or at the carb. " O " ring.
Check your carb. seating into the engine.
Or maybe the " O " ring on the needle valve.
Hope this is of some small help.
Regards

here when wanted; there when needed; everywhere when looked for

02-09-2008 05:22 AM

Budgie
Senior Heliman
Location: England

hi m8 it is a brand new engine runs fine evan tho only had 3 tanks ran through it. Have looked at wot you said all ok seating well head tight exhaust tight but wont cut god knows!!!!! have you ever seen a heli engine flying without a model?? cos last nighti nearly slung it out the window !!!! it has got me so i want to get to the bottom of it

http://budgieshelicopterclub.co.uk

02-09-2008 12:19 PM

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airdodger
Key Veteran
Location: Johnston USA

If the engine keeps running it is getting air from somewhere, if the engine has a throttle stop screw back it off, if not start looking for intake leaks.

Chris

02-09-2008 12:33 PM

Budgie
Senior Heliman
Location: England

hi m8 no stop screw

wish it was that easy!!! will have another look at it later

where else can i look??

http://budgieshelicopterclub.co.uk

02-09-2008 01:15 PM

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airdodger
Key Veteran
Location: Johnston USA

Look at any part that can leak, head, throttle barrel, backplate, carb to case.

Chris

02-09-2008 02:15 PM

Budgie
Senior Heliman
Location: England

Hi again M8 do you run one of the said engines ?? if so the bottom end screw do you know what the factory settings are for it ?? i have now downloaded the manual and it only tells you top end 3 turns out and work from there

http://budgieshelicopterclub.co.uk

02-09-2008 02:28 PM

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SkateFreak
Key Veteran
Location: Cambs UK/Luton

I had an MDS plank engine like that!
It was one in a million, screamed like hell's bells, awsome engine and with anything less than an 8x6 with the carb fully closed it would not stop...
I just put a bigger prop on there... maybe more masked the problem but its nothing major, Still runs like a champ

-Jvr

02-09-2008 04:41 PM

Budgie
Senior Heliman
Location: England

Ahhh thanks for that i will take the blades off and fly it with a prop !!!!

http://budgieshelicopterclub.co.uk

02-09-2008 07:13 PM

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SkateFreak
Key Veteran
Location: Cambs UK/Luton

sounds like a plan.
maybe just richen it up a little?
may last longer and wont idle as low

Best regards

-Jvr

02-11-2008 01:38 AM

revomix
Senior Heliman
Location: Stanton Ca

small defalt(crack Or pin hole) in the case or bad leaky front bearing.

Fly It Crash It , Fix It!!

02-13-2008 09:36 PM

robhurlin
Veteran
Location: Pretoria, South Africa

Sounds like you have a carb with a defect on the barrel or mounting. On my TT120 I had to seal the carb in with RTV - the rubber gasket wasn't enough.

Anyway, my TT91 drove me nuts as it was impossible to tune (either to rich with no power or would lean out too much) so I DID chuck it out and put an OS91SZH - pure bliss, just plug and play!!

Rob.

02-16-2008 12:20 AM

Budgie
Senior Heliman
Location: England

Hi robhurlin god knows wots the matter with the thing new o rings flys nice now after 3 tanks but thing will not cut

so ive done the same as you just got an OS will fit over the weekend

but i just want to get to the bottom of this TT90 driving me mad !!!!

http://budgieshelicopterclub.co.uk

02-16-2008 02:24 PM

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ady
Senior Heliman
Location: norfolk england

budgie , you been mad for years mate , so no diference there then

02-16-2008 02:41 PM

Budgie
Senior Heliman
Location: England

Hi Ady hows it hanging ????

http://budgieshelicopterclub.co.uk

02-16-2008 02:48 PM

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ady
Senior Heliman
Location: norfolk england

perfectly

02-16-2008 03:23 PM

robhurlin
Veteran
Location: Pretoria, South Africa

Budgie, I can't comment on your sanity but I can agree that TT engines can drive us nuts. I have two TT120 plank engines. One I bought new and it has done excellent service in a 1/4 scale Extra 230. It starts brilliantly each time and runs without hassles.

The other one I bought 2nd hand with a 1/4 scale Cap 232. It ran fine for a while and then started cutting out in the air. I could not solve the problem after re-sealing the carb, replacing the fuel tank and lines and etc. Eventually I took it out and put an OS 160FX in. The plane flew amazingly to the last drop of fuel. I gave the TT120 to a LHS to sell and it is still sitting there on the shelf 3 years later. Nobody wants a TT engine with a history!!

You'll love your OS - let us know how it goes. Don't let the TT bug you. Attach it to fishing line with a hook and catch a big one!!

Rob.

02-16-2008 04:31 PM

Budgie
Senior Heliman
Location: England

Hi m8 just fitted the OS, been looking at the TT90 everything is sealed perfect carb closes if i blow down barrel when closed cant, no sign of any air leak but cant understand why it wont cut

i will let you know how i get on with the OS but that wont be till Thursday, and ive just noticed it has 3 needles never had 3 before so shoud be interesting

http://budgieshelicopterclub.co.uk

02-16-2008 09:02 PM

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robhurlin
Veteran
Location: Pretoria, South Africa

You'll love the midrange needle! It makes it possible to get consistent mixture across all flight regimes.

Rob.

02-16-2008 09:26 PM

airdodger
Key Veteran
Location: Johnston USA

Everything is not sealed perfect or the engine would shut off, it can't, won't run without air period. You need to pressure test the engine in liquid and see where it leaks.

Chris

02-16-2008 09:51 PM

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