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carb cleaning
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mk2sean



Joined: 04 Apr 2016
Posts: 38
Location: Scotland

PostPosted: Sat Feb 04, 2017 1:22 pm    Post subject: Reply with quote

http://old-skool-suzuki.proboards.com/thread/1239/mikuni-40mm-carbs-bst-bible


is the bst the same as the cv? Just looking for a guide for cleaning them up. Found this guide when I searched for cv 40 carbs, will this be ok to follow?
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brian



Joined: 22 Aug 2011
Posts: 3769
Location: Australia

PostPosted: Sun Feb 05, 2017 10:54 am    Post subject: Reply with quote

Not the same carbs but the principle is the same. Very similar. Looks to be a well put together 'how to' thread.

Just take note amd write down the settings in YOUR carbs as you strip them, like.... float height, number of turns out on pilot screws, jet sizes and jet needle numbers. Sometimes inner and outer carbs will have slightly different sizes, but my SB6 carbs are all the same
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'99 DB4 #104, '96 SB6 #1165, '94 DB2 J #652, '99 DB4 #088, '08 VTX1800, '93 ZXR750R M1, '95 ZXR750, '95 ZXR750 Race Bike, '94 CBR400rr NC29 Race Bike, '94 CB250, '49 BSA C10 250, '61 BSA A10 650, '89 ZXR750, '91 Ducati 851
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mk2sean



Joined: 04 Apr 2016
Posts: 38
Location: Scotland

PostPosted: Sun Feb 05, 2017 1:39 pm    Post subject: Reply with quote

Cheers for that. Just nice to have a reference to go by.

on a slightly different subject, anyone know where I can get a new fuel valve set up? The mechanical part is fine but the electrical part which I assume is the solenoid has had a repair on it with what looks like plastic metal and the fuel that has leaked on to it has melted it. Not keen to use it again due to the spark and fire risk.
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mk2sean



Joined: 04 Apr 2016
Posts: 38
Location: Scotland

PostPosted: Sun Feb 05, 2017 4:01 pm    Post subject: Reply with quote

I know I am a pain in the arse but I meant to ask another question.

When you remove the fuel pump what do you do with the 1/4" line that runs from the pump to the inlet of number 3 cylinder downstream of the carbs? Is it just a case of blocking it off by plugging the hose or is it just open ended in the airbox?

Also, do the lines to the fuel rail need to be of equal length to prevent starvation to a bank ocarbs?

I cant help thinking this is entry level stuff. But every time I work on the bike I have the sensation my old man is looking over my shoulder drying his teeth and rolling his eyes. Lol.
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Jonny B Bad



Joined: 05 Dec 2009
Posts: 555
Location: NE London

PostPosted: Sun Feb 05, 2017 5:03 pm    Post subject: Carb cleaning Reply with quote

Take the vacuum hose off at the carb manifold. Put a rubber cap over the hole on the manifold and a rubber grommet in the hole in the airbox. Don't vent the hose into the airbox, as the number 3 carb will be drawing too much air compared to the others.

The fuel lines don't need to be equal length, but you do need to make sure that they will not kink and give you fuel starvation. I use a '1 in 2 out' fuel filter from Pingel, rather than complicating the plumbing with a "Y" piece.

The electric fuel cocks can be had off e-bay.
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What, Jonny's gone!
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bimota_rider



Joined: 06 Jul 2013
Posts: 213
Location: Utah, USA

PostPosted: Sun Feb 05, 2017 5:15 pm    Post subject: Reply with quote

Permanently block off the vacuum line AT the cylinder, with a pipe cover of some sort.

The supply hoses can be of slightly different lengths, but making them the same should not be an issue. I would make them the same, only because I am an anal asswipe, with a keen eye for symmetry .

no question is dumb...only answers are.... Embarassed

Sorry Jonny! You beat me to the puncvh by mere minutes...I am glad we were on the same page, at least.... Very Happy
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'98 Bimota SB6R #000016 "Sweet 16"
Built 5/97

2014 Suzuki Hayabusa

2001 BMW R1100S
.
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mk2sean



Joined: 04 Apr 2016
Posts: 38
Location: Scotland

PostPosted: Sun Feb 05, 2017 5:44 pm    Post subject: Reply with quote

I have had a look for motorcycle electric fuel petcock every week since I noticed the problem. Not had any luck so far.

got my pingel one in two out filter ordered now.
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bimota_rider



Joined: 06 Jul 2013
Posts: 213
Location: Utah, USA

PostPosted: Fri Feb 10, 2017 10:42 pm    Post subject: Reply with quote

Sean,

Here is an ad for one, albeit in the USA. But, the make and model are listed....I am NOT sure if the electric is the fuel shut off, the gauge, or low fuel light, or all three.


http://www.ebay.com/itm/1993-Yamaha-Virago-XV535-Y588-fuel-petcock-valve-with-electric-switch-/232140628357?hash=item360ca8e185:g:Wp0AAOSw4GVYGgvF&vxp=mtr

I, too, am in need of one, to replace my failing cock...(I am in my 50s...LOL)

It may take some modifying, but, it's a starting point.....Next time I tear my bike down (probably in the spring) I will take a closer look.


.
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'98 Bimota SB6R #000016 "Sweet 16"
Built 5/97

2014 Suzuki Hayabusa

2001 BMW R1100S
.
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mk2sean



Joined: 04 Apr 2016
Posts: 38
Location: Scotland

PostPosted: Mon Mar 13, 2017 12:47 pm    Post subject: Reply with quote

Just about to rebuild the carbs today. I have a new seal kit from Thailand to do this with. Will putting new orings on make it necessary to make changes to settings like the mix screw? I only ask since we are talking about such small adjustments I thought the new oring might make a difference.
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mk2sean



Joined: 04 Apr 2016
Posts: 38
Location: Scotland

PostPosted: Mon Mar 13, 2017 6:53 pm    Post subject: Reply with quote

Screws on float bowls were pretty mashed when I went to take them out. Ordered cap screw ones but alas they were the wrong size. I have the carbs built now but used stainless screws for the bowls. Should I replace them with original material screws or will stainless ones be fine? Just worried about two materials reacting with each other.
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brian



Joined: 22 Aug 2011
Posts: 3769
Location: Australia

PostPosted: Mon Mar 13, 2017 10:55 pm    Post subject: Reply with quote

I use stainless cap screws in my carbs
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'99 DB4 #104, '96 SB6 #1165, '94 DB2 J #652, '99 DB4 #088, '08 VTX1800, '93 ZXR750R M1, '95 ZXR750, '95 ZXR750 Race Bike, '94 CBR400rr NC29 Race Bike, '94 CB250, '49 BSA C10 250, '61 BSA A10 650, '89 ZXR750, '91 Ducati 851
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mk2sean



Joined: 04 Apr 2016
Posts: 38
Location: Scotland

PostPosted: Mon Mar 13, 2017 11:41 pm    Post subject: Reply with quote

Great. I will go with that then.
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brian



Joined: 22 Aug 2011
Posts: 3769
Location: Australia

PostPosted: Tue Mar 14, 2017 10:30 am    Post subject: Reply with quote

mk2sean wrote:
Great. I will go with that then.


I haven't had any trouble with them. Those rotten stock Phillips screws always seem the strip in the head though Crying or Very sad
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'99 DB4 #104, '96 SB6 #1165, '94 DB2 J #652, '99 DB4 #088, '08 VTX1800, '93 ZXR750R M1, '95 ZXR750, '95 ZXR750 Race Bike, '94 CBR400rr NC29 Race Bike, '94 CB250, '49 BSA C10 250, '61 BSA A10 650, '89 ZXR750, '91 Ducati 851
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Evilchicken0



Joined: 12 May 2010
Posts: 2996
Location: London

PostPosted: Tue Mar 14, 2017 12:50 pm    Post subject: Reply with quote

I use stainless allen heads.
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mk2sean



Joined: 04 Apr 2016
Posts: 38
Location: Scotland

PostPosted: Tue Mar 14, 2017 3:15 pm    Post subject: Reply with quote

Should I be prepared to adjust the mix screw because of the new orings?
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