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 Balancing TBs Revs Rising - Bell Crank Screw

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Carlotto
Carlotto
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Join date : 2020-05-23

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PostSubject: Balancing TBs Revs Rising - Bell Crank Screw   Balancing TBs Revs Rising - Bell Crank Screw Icon_minitime1Fri Jun 12, 2020 3:40 pm

I'm trying to balance my TBs and wishing I'd bought a manometer

First attempt 3mm tubing (it's what I had) water moves too quickly, oil gets too many air bubbles in it

Second attempt 4mm tubing - stolen from the fish tank - oil still bubbles up, water still moves too fast - engine has digested a bit of both !

I've tried my daughter & my wife holding the throttle at 3.5 - 4k and they swear that as I adjust the bell screw it's raising the revs up to 5k-7k

Surely it can't and they are moving their hands ?

I've reset my TPS and the base value is correct but it only reads 85% at full throttle - is that right ?

Thanks
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beetle
GRiSO Capo
GRiSO Capo
beetle

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Join date : 2013-09-30

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PostSubject: Re: Balancing TBs Revs Rising - Bell Crank Screw   Balancing TBs Revs Rising - Bell Crank Screw Icon_minitime1Fri Jun 12, 2020 6:38 pm


Revs rising with bell crank adjustments is normal. I'm always on my lonesome when I do it, so I adjust, then close the the throttle and then back to 3.5K and adjust again. It's an iterative process.

You need dampers in your manometer.

The throttle reading is butterfly angle. So that's 85°, not percent.




Last edited by beetle on Fri Jun 12, 2020 6:57 pm; edited 1 time in total
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Bbbbbbad
Carlotto
Carlotto
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Join date : 2020-05-23

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PostSubject: Re: Balancing TBs Revs Rising - Bell Crank Screw   Balancing TBs Revs Rising - Bell Crank Screw Icon_minitime1Fri Jun 12, 2020 6:43 pm

Thanks

Yes it's far more volatile than I thought
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Kiwi_Roy
Sfregiato
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PostSubject: Re: Balancing TBs Revs Rising - Bell Crank Screw   Balancing TBs Revs Rising - Bell Crank Screw Icon_minitime1Sat Jun 13, 2020 1:49 am

The Bell Crank screw operates like the throttle stop for the left hand body.
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Bbbbbbad
Carlotto
Carlotto
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PostSubject: Re: Balancing TBs Revs Rising - Bell Crank Screw   Balancing TBs Revs Rising - Bell Crank Screw Icon_minitime1Mon Jun 15, 2020 7:16 am

Yes but I was just surprised that adjusting it could raise the revs so much

I'm waiting for a biking mate to pop over
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