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who
Joined: 10 Nov 2010
Posts: 402
Location: Melbourne Australia
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 Posted: Wed Nov 27, 2013 6:35 am Post subject: |
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Some of the 'differences' in jet sizes are the result of how different manufactures size their jets. Here is a comparison of 3 different makers.
Many of the manufacturers jet lean to comply with emissions, and also to keep power down if the bike was for instance Japanese market.
I've recently purchased a Dynojet Wide band commander, with 10 minutes of of mixture in relation to rpm and gear data logging, I think the days of guessing are over 
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Vince186
Joined: 23 Mar 2012
Posts: 636
Location: Nijmegen (Netherlands)
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| Posted: Wed Nov 27, 2013 4:20 pm Post subject: |
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| brian wrote: |
Thanks Vince. The plastic assembly that holds the float is held in place by the float bowl. I'm guessing that i need to hold it down tight with mt finger to get an acurate measurement... yes?
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Hi Brian,
You only push it lightly down when the plastic assy is loose from the carb body.
See pic.
After that measure the height
Inspect the o-rings that hold the plastic assy in place, or renew them its not that expensive and I guess they are more than ten years old. In my case they were really bad.
The question is, is it important that the fuel level is correct…. Yes ….
Fuel level too high is too rich, level too low is too lean.
Can you adjust your needles with a clip or are they stock Suzuki?
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vince
A person who never made a mistake never tried anything new. Albert Einstein |
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Vince186
Joined: 23 Mar 2012
Posts: 636
Location: Nijmegen (Netherlands)
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| Posted: Wed Nov 27, 2013 4:26 pm Post subject: |
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| who wrote: |
Some of the 'differences' in jet sizes are the result of how different manufactures size their jets. Here is a comparison of 3 different makers.
Many of the manufacturers jet lean to comply with emissions, and also to keep power down if the bike was for instance Japanese market.
I've recently purchased a Dynojet Wide band commander, with 10 minutes of of mixture in relation to rpm and gear data logging, I think the days of guessing are over
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Thanks, for that list. Things are me more clearly now for me.
Now I know why I was sometimes completely lost with changing the main jet. 
Can a wideband commander also be used for carb adjustment?
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vince
A person who never made a mistake never tried anything new. Albert Einstein |
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who
Joined: 10 Nov 2010
Posts: 402
Location: Melbourne Australia
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| Posted: Fri Nov 29, 2013 6:37 am Post subject: |
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Yes, the Wide band Commander is a Air/Fuel diagnostic tool. It effectively eliminates the need for a dyno, as all your tuning can be done in the real world. As I think I said earlier, you can log a 10 minute session of riding, giving you A/F in relation to rpm, TPS, and gear. All downloadable to laptop, for analysis. It can also be coupled with the power commander ignition modules, but I'm not sure how that works. I bought mine second hand on ebay for 200 dollars. Cheers,
Ralph
http://www.widebandcommander.com/default.aspx |
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brian
Joined: 22 Aug 2011
Posts: 3790
Location: Australia
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| Posted: Fri Nov 29, 2013 12:26 pm Post subject: |
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| Vince186 wrote: |
| brian wrote: |
Thanks Vince. The plastic assembly that holds the float is held in place by the float bowl. I'm guessing that i need to hold it down tight with mt finger to get an acurate measurement... yes?
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Hi Brian,
You only push it lightly down when the plastic assy is loose from the carb body.
See pic.
After that measure the height
Inspect the o-rings that hold the plastic assy in place, or renew them its not that expensive and I guess they are more than ten years old. In my case they were really bad.
The question is, is it important that the fuel level is correct…. Yes ….
Fuel level too high is too rich, level too low is too lean.
Can you adjust your needles with a clip or are they stock Suzuki?
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My needles have a white plastic spacer, silver washer and clip. I thought that this was stock Suzi??
_________________
'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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Vince186
Joined: 23 Mar 2012
Posts: 636
Location: Nijmegen (Netherlands)
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| Posted: Fri Nov 29, 2013 4:31 pm Post subject: |
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| brian wrote: |
My needles have a white plastic spacer, silver washer and clip. I thought that this was stock Suzi?? |
Aahh sorry Brian, …. I was confused with another bike of mine.. 
You have stock Suzi needles.
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vince
A person who never made a mistake never tried anything new. Albert Einstein |
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brian
Joined: 22 Aug 2011
Posts: 3790
Location: Australia
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| Posted: Fri Nov 29, 2013 11:10 pm Post subject: |
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| Vince186 wrote: |
| brian wrote: |
My needles have a white plastic spacer, silver washer and clip. I thought that this was stock Suzi?? |
Aahh sorry Brian, …. I was confused with another bike of mine..
You have stock Suzi needles. |
Cool 
I cleaned and re-assembled the carbs Tuesday night before i went back to work. Just have to set the float heigts before reinstalling into the bike. Wanted to leave the setting of the floats till i was fresh so will do that today. Taking the rims to town this morning to get some new rubber fitted and hopefully will have a test ride this afternoon..
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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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brian
Joined: 22 Aug 2011
Posts: 3790
Location: Australia
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| Posted: Sat Nov 30, 2013 11:41 am Post subject: |
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Well the carbs are back on, new tyres are on, syncronized the carbs and it seems to run ok. Will put the bodywork back on tomorrow and take it for a test ride.
I haven't had these tyres before so hopefully i'll be pleased with them. They are Michelin Pilot Power 3's. Apparently lean slightly more towards track use than road use. I'm doing a track day on the SB6 in 2 weeks time.
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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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Vince186
Joined: 23 Mar 2012
Posts: 636
Location: Nijmegen (Netherlands)
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| Posted: Mon Dec 02, 2013 12:23 pm Post subject: |
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Brian, how was the test ride 
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vince
A person who never made a mistake never tried anything new. Albert Einstein |
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brian
Joined: 22 Aug 2011
Posts: 3790
Location: Australia
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| Posted: Sun Dec 08, 2013 1:51 am Post subject: |
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Went out for a test ride today.When i open the throttle low to mid revs, say under 6k it seems to die. Once it gets to aroumd 7k it pulls really well right through to redline.
Would this be to do with the needle clip setting or possibly float level? I'm guessing that the main jets at 120 are right for this bike as the top end is fine.
I'm going to have to live with it for the upcoming track day as i don't have time to pull it down again..
_________________
'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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brian
Joined: 22 Aug 2011
Posts: 3790
Location: Australia
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| Posted: Sun Dec 08, 2013 1:52 am Post subject: |
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How do i know if this issue is flooding or not enough fuel?
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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
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| Posted: Sun Dec 08, 2013 10:59 am Post subject: |
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That's where a dyno is useful.
If you cleaned the plugs then ran the engine at the desired revs then use the kill switch. Pull the plugs and see if they're dark or light.
Check the choke is coming off cleanly
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brian
Joined: 22 Aug 2011
Posts: 3790
Location: Australia
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| Posted: Wed Dec 11, 2013 1:08 pm Post subject: |
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I don't have access to a dyno so it'll be trial and error for me. I'll also check the choke but am pretty sure that it returns all the way off.
_________________
'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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CBar
Joined: 05 Jan 2010
Posts: 142
Location: Texas
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| Posted: Thu Dec 12, 2013 9:34 pm Post subject: |
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If it is too rich, you will have poor throttle response, but it won't die.
If it dies/stalls, then you are probably too lean and need to raise your needles...one position at a time.
If you tape up part of the opening on your airbox and the performance improves, then you will know you are too lean. |
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brian
Joined: 22 Aug 2011
Posts: 3790
Location: Australia
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| Posted: Tue Dec 17, 2013 12:21 am Post subject: |
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| CBar wrote: |
If it is too rich, you will have poor throttle response, but it won't die.
If it dies/stalls, then you are probably too lean and need to raise your needles...one position at a time.
If you tape up part of the opening on your airbox and the performance improves, then you will know you are too lean. |
Thanks for the info mate. I'll try this when i get some time. The bike performed really well on the track day. Still has the dead spot below 5k when opening the throttle quickly but higher in the revs it ran superbly.
_________________
'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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