Re: Engine goes flat on declaration

Overpriced Parts /
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> Roger Suarez Wrote:

> -------------------------------------------------------

> Hello, I'm trying to track down an issue when I let off the throttle.

>

> I accelerate hard and then when coming to a light or stop sign, when

> letting off the engine goes totally flat and I have to twist the

> throttle on/off to keep it from turning off. She also 4strokes like

> crazy when doing this. (On/off throttle)

>

> Has smallest pilot jet available already (10) TM24. Need bigger pilot

> or needle adjustment is the culprit?

Sounds like Idle/pilot jet size and air screw adjustment, pretty sure they make a 7.5 jet but I never needed one, one of my tm24’s have larger 12.5 size, all my air screws come in at 1.5 to 1.75 turns and 1/8 throttle makes the braaapp sound which is about optimal,

if you have all that, you could be too rich in overall jetting or you need needle clip changes,

The float level are very sensitive on those carburetors too.

Even though I had all that right, I have one polini reed kit bike that has a dellorto 21 mm PHBG that was doing (though not as bad) the symptoms you described, I put a spring loaded float needle in it and it eliminated the problems

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