I just ordered the Raptor with the TT36 engine and did alot of
research. Try to read through as many old raptor/tt36 posts as you can
find. Here are some specific and general suggestions:
If you are using 30%, make sure you use the shims.
Check the clunk
Try setting the low speed to 1 1/2 turns out (do this with the throttle
closed). And set the high speed to 2 turns (a little rich). Then
adjusting the needle settins as below. A rich low end can hose up your
Check your fuel filter.
Check or just go ahead and replace your fuel tubing. I had a ferrite
chew and a fuel tubing once, ruined my day as I took off without a
thought and immediatly had to do an Auto (SUPRISE!). Air bubbles in a
leaky fuel line or fuel tank can lean it out (needle valves will just
confuse you then). The air bubbles will make it cut off just around
half throttle. I just helped out an airplane flyer the other day with
this problem. Kinked fuel line was letting in bubbles and leanin out
the engine. It idled fine but would not transition.
Are You using an Enya 3 or OS 8 plug?. I personally swear by the Enya
Assuming its a needle problem this should work:
Every time you adjust the high end, take the time to use the pinch test
to set the low end. That way you will know if the problem is the high
end or not when throttling up. If you start the high end at 2 turns,
you should be rich so a slow process of leaning it till it climbs steady
at full throttle.
The pinch test, when idle, pinch the fuel line going into the carb. If
it revs up just slightly then its slightly rich (probably fine). If it
revs up ALOT and stays there with a slight pinch (not cutting off the
fuel entirely) then its too rich. If it cuts off almost immediatly then
its too lean. (this works for airplane engines also).
Let us know how it goes.
> OK, I disassembled the whole carb - found nothing wrong that I could
> tell. BTW, the reversing of engine direction occured at mid-throttle,
> and not at idle. It really surprised me when i saw the rotor blades
> going backwards - seemed to run ok in reverse though..
> Anyway, haven't found the cause of sudden stopping at 1/3 to 1/2
> throttle yet. I did change glow plugs and no difference. I think it's
> just a piece of ***engine causing the problem
> thanks for the reply,
> > Sometimes when trying to idle the engine at too low a speed, it will
> > direction and run backwards. Running backwards will not be entirely
> > eliminated with any two-stroke glow engine, but it can be
> > minimized by raising the idle speed a bit.
> > I don't know what is wrong with your engine, but if it was mine, the
> > thing that I would do is to remove the carburetor and make sure that
> > are no foreign objects in the high speed jet (spray bar). Having
> > in the spray bar will quite often lead to the symptoms you have
> described. I
> > would perform this check before I did anything else, other than
> > that I had absolutely fresh fuel of a type recommended by the engine
> > manufacturer and a good glow plug installed.
> > Check the spray bar for unwanted objects and let us know what you
> find. Good
> > luck.
> > --
> > Ed Cregger
> > > Hello all,
> > > I have a TT36 which dies abruptly about 1/3 to 1/2 throttle. I had
> > > running at one time and flew about 5 tanks, but since then it just
> > > won't keep running no matter how I mess with the low speed and high
> > > speed needle valves. Is this the symptom of the bad low speed needle
> > > valve? (I've sent off for a replacement and also ordered an OS 32.)
> > > one setting of the needle valves, it sputtered, then ran BACKWARDS.
> > > This happened a couple of times - what caused that? - too lean??
> If I
> > > back out the low speed to 2 turns, the engine seems to flood an is
> > > hard to start.
> > > One more question- I've heard of the "pinch" test at idle and don't
> > > know what I'm supposed to be listening for and for how long. Could
> > > someone explain please?
> > > thanks
> > > derf
> > > Sent via Deja.com http://www.FoundCollection.com/
> > > Before you buy.
> Sent via Deja.com http://www.FoundCollection.com/
> Before you buy.