Speed Issue - Rally 200

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Speed Issue - Rally 200

Postby rollertom » Sun May 24, 2015 6:15 pm

Greetings from New York! So my Rally 200 is still being a diva :cry: Ironically, the Lambretta DL150 is running great.

The Rally doesn't want to speed up and go beyond 50mph. At ~35mph in the 3. gear and ~50mph in the 4. gear she hits resistance and it feels she is falling in a hole though she keeps the speed - she wants but can't...

All the things that happened so far and the problem persists:
- new NGK spark plug wire
- stator rewired
- new BGM Pro Fast Flow fuel tap
- new thicker fuel line
- SIP fuel line adapter to prevent kink under the tank
- SIP Road 2.0 (needs rejetting)
- Pollini Venturi air filter
- Replaced SI24/24 carb (new) with flatt throttle plate (put the new cutaway plate aside as they are supposed to be harder to set correctly), 122 jetting (118 would be stock), extended too small fuel hole in chamber for faster flow (1.5mm to 2.5mm).

Otherwise she is all stock with 6V Femsa-replacement ignition. Plugs look fine, slightly on the rich side.

Has anybody an idea what could cause her temper? :?

Thanks!
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Re: Speed Issue - Rally 200

Postby spiderwebb » Wed May 27, 2015 8:21 pm

Timing that is set statically too far retarded shall never allow the kit to run at full potential.

Can you check it and make sure it is set right..?
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Re: Speed Issue - Rally 200

Postby spiderwebb » Wed May 27, 2015 8:26 pm

Did you....
- squish is between 1.25 and 1.75mm for best power
- all transfers and ports matched including the gaskets that can at times block mixture flow up into barrel
- clutch.... if rpms go up but speed doesn't then you clutch is slipping. Can be due to wrong oil. Old oil. Clutch springs are old. Clutch corks are glazed and worn out or clutch basket is worn causing the plates tabs to get hung up resulting in it not locking together
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Re: Speed Issue - Rally 200

Postby spiderwebb » Wed May 27, 2015 8:30 pm

Jetting...
If engine is too lean the exhaust note goes a bit dull and hollow sounding. Not good.

If main jet is too rich you get missing, smoke and oil out exhaust, fouling plugs and a sort of hesitation while going full speed.

If you pull out your choke while riding and the engine likes the extra fuel and doesn't stall out or bog then you know your jetting is too lean for that throttle opening
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Re: Speed Issue - Rally 200

Postby spiderwebb » Wed May 27, 2015 8:34 pm

Air leaks can do the opposite...
Do the carb cleaner spray test to see if there is a air leak

Around barrel head, base of kit, carb base, exhaust flange

Also pop off flywheel and look under stator to see if there is any oil... if so that seal is shot
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