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12425 - Established June, 2013 - all GRiSO, all the time...
 
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 Throttle Body balancing

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beetle
GRiSO Capo
GRiSO Capo
beetle

Posts : 8822
Join date : 2013-09-30

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PostSubject: Re: Throttle Body balancing   Throttle Body balancing - Page 5 Icon_minitime1Tue Aug 31, 2021 3:57 pm


Morgan Carbtune. 'Nuff said.



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kiwi dave
GRiSO Capo
GRiSO Capo
kiwi dave

Posts : 641
Join date : 2014-04-23
Age : 73

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PostSubject: Re: Throttle Body balancing   Throttle Body balancing - Page 5 Icon_minitime1Tue Aug 31, 2021 7:50 pm

beetle wrote:

Morgan Carbtune. 'Nuff said.

I prefer the twin max.  It compares the amount of suck in each inlet port, and balances the differential.

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I had mine for over forty years.  Still going strong.

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beetle
GRiSO Capo
GRiSO Capo
beetle

Posts : 8822
Join date : 2013-09-30

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PostSubject: Re: Throttle Body balancing   Throttle Body balancing - Page 5 Icon_minitime1Tue Aug 31, 2021 10:37 pm


Well I've had my Carbtune since the Silurian Era. When I was riding 4 cylinder Suzuki's. Or was that the Pre-Cambrian Era?  scratch


Nyer!  Razz




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Buellbloke
Biondino
Biondino
Buellbloke

Posts : 201
Join date : 2021-07-30
Age : 58

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PostSubject: Re: Throttle Body balancing   Throttle Body balancing - Page 5 Icon_minitime1Wed Sep 01, 2021 3:00 am

beetle wrote:

Well I've had my Carbtune since the Silurian Era. When I was riding 4 cylinder Suzuki's. Or was that the Pre-Cambrian Era?  scratch


Nyer!  Razz



Am with you dude, am still trying to wrap my head around why people are using Power Commanders and Booster Plugs when they could be running a much better Beetle map Question
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Oz1200Guzzi
Don Abbondio
Don Abbondio
Oz1200Guzzi

Posts : 5490
Join date : 2014-03-13
Age : 66

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PostSubject: Re: Throttle Body balancing   Throttle Body balancing - Page 5 Icon_minitime1Wed Sep 01, 2021 2:20 pm

I got "offered" a booster plug when I purchased my V85 a few weeks back. Surprised at where the offer came from too.

Some disappointment in all that.
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lcjohnny
GRiSO Capo
GRiSO Capo
lcjohnny

Posts : 538
Join date : 2016-01-25
Age : 66

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PostSubject: Re: Throttle Body balancing   Throttle Body balancing - Page 5 Icon_minitime1Wed Sep 01, 2021 4:17 pm

Had a carbtune since the cambrian (when i was employed spannering on T140s)  

it wore out.  the steel rods scratch in the tubes until the stiction becomes really F*%king frustrating.

Bought a pair of cheap dial gauges (Bourdon type) swapped them over to check calibration and speed of respnse (it turns out that A reads 4% higher than B) marked them with the variation and that is it done.

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BBB888
Grignapoco
Grignapoco
BBB888

Posts : 125
Join date : 2017-05-24

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PostSubject: Re: Throttle Body balancing   Throttle Body balancing - Page 5 Icon_minitime1Wed Sep 22, 2021 3:57 am

Having ridden my GRiSO around London for the past 10 days I am more aware of low rev fuelling glitches. Seems almost like it runs on 1 pot until 3/3500 rpm when it all smooths out. Anyway, looked on the BSD website (UK dyno tuner) who smoothed out my KTM990 years ago, and found that they have done a GRiSO:
[You must be registered and logged in to see this link.]
Think I'll give them a go, unless anyone has better suggestion?
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Pete Roper
GRiSO Capo
GRiSO Capo
Pete Roper

Posts : 8440
Join date : 2013-05-29
Age : 64

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PostSubject: Re: Throttle Body balancing   Throttle Body balancing - Page 5 Icon_minitime1Wed Sep 22, 2021 5:11 am

Have you checked the plug caps aren't arcing to the rocker cover?
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BBB888
Grignapoco
Grignapoco
BBB888

Posts : 125
Join date : 2017-05-24

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PostSubject: Re: Throttle Body balancing   Throttle Body balancing - Page 5 Icon_minitime1Wed Sep 22, 2021 5:55 am

No, but I will! My description of the lumpy low down feeling as if its running on one not two is a slight exaggeration! Just that it all smooths out at 3/3500rpm and although I think I have the 068 Map it might be worth a trip to BSD to fine tune it. All these noises and lumpy running only being noticed as I am riding in the City for the past week and probably another week whilst my Vespa is off the road!
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Pete Roper
GRiSO Capo
GRiSO Capo
Pete Roper

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Age : 64

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PostSubject: Re: Throttle Body balancing   Throttle Body balancing - Page 5 Icon_minitime1Wed Sep 22, 2021 6:00 am

Are the throttle bodies balanced correctly? Is the tune correct? Also the 68S map was originally developed for the flat tappet motor. I've never run it in a roller bike. That might be a factor in low speed behaviour.
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BBB888
Grignapoco
Grignapoco
BBB888

Posts : 125
Join date : 2017-05-24

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PostSubject: Re: Throttle Body balancing   Throttle Body balancing - Page 5 Icon_minitime1Wed Sep 22, 2021 6:04 am

Thanks. Was serviced in 2019 at Twiggers in UK but hasn't done much since due to Lockdown, until recently. So throttle bodies should be balanced but I will check. Map is just what I understood from some distant memory but could be wrong - Ill check! I've just treated her to a full fresh tank of 'super unleaded' to avoid the E10 and at a cost of £1.53 a litre!
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