Qualcast 35 S Strange problem

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RIPMAXRAPIER
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Joined: 29/05/2016 - 21:15
Qualcast 35 S Strange problem

Dear Experts,

I have an up until the end of last mowing season excellent running Qualcast 35s with Tecumseh 5148 or maybe 6148 Carburettor. After starting well all season suddenly it needed the Choke left fully on all the time to run correctly. If I even click the Choke back 1 click it will stop running, so I have to start it with the Choke full on and leave it like so to keep it going. I distinctly remember in the recent past accidentely forgetting to back the choke off after starting, and the lawn mower would have stopped until I clicked the Choke right back to totally off. A while back, I had to replace a very badly dozed Carburettor bowl Rubber O Ring (the big one) as the mower suddenly at the start of the new season was very difficult to start. I have just ordered from JAPG a new Float needle/spring/seal assembly in case the inlet is not shutting off as the carb bowl fills with petrol, I have also ordered a new Sponge Filter and Spark Plug as I read somewhere that these should be replaced every 2 years, the Foam Air Cleaner I have removed is very badly dozed and quite filthy and decomposing. Is there anything else I need to check please as this Choke having to be left on all the time happened suddenly it was not gradual. Many thanks Paul

wristpin
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Joined: 23/05/2012 - 22:09
Other than the air filter you

Other than the air filter you probably don’t need any new parts but what the machine does need is a very thorough carburettor clean - preferably in an ultrasonic cleaning tank.

RIPMAXRAPIER
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Joined: 29/05/2016 - 21:15
Angus,

Angus,

Thanks for your help, you helped me before with an old Suffolk Super Punch 14" a couple of years back and got it going very nicely. I will do as you suggest and also fit a new Air Cleaner Foam as the existing one is decomposing. The Spark Plug is an old NGK donkeys years old, as the lawnmower is 20 years old and my late dad probably never had it replaced. The Lawnmower is in terrific condition for its age, almost like new.

My old Suffolk Punch now needs a new Fuel Tank as the existing tank is rusted internally and every year at the start of the season I have to de-gunge the Zenith 13 TC Carburettor , as it is full of rust particles. I have bought a new 1 litre plastic tank from Japan and I will be fitting it over the next few weeks to solve this issue once and for all, it wont look right but it will stop the old rotten tank from polluting the carburettor.

Many thanks for your much valued assistance.

wristpin
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Joined: 23/05/2012 - 22:09
Why not just derust  the

Why not just derust  the existing one or  fit an in-line filter to catch the crud before it gets to where it can cause a problem ?