81 spada nt carburation |
Post Reply |
Author | |
danmiluk
Falcone Joined: 30 Aug 2016 Location: scotland Status: Offline Points: 66 |
Post Options
Thanks(0)
Posted: 10 Jan 2017 at 20:13 |
Hi guys, i went balance the carbs on the bike. My books tells me to screw in the air mix screw then out by 1 1/2 turns would this be correct, i can remember readings some place that the left cyclinder 2 1/2 and the right 2 3/4.
what has prompted me to look at the carbs the right plug was super sooted, could anyone enlighten me. cheers danny |
|
Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
Post Options
Thanks(0)
|
If one plug is very black, check the choke cables are loose when off, and the choke plunger is seating properly. Sometimes the neoprene seal on the bottom of the plunger gets distorted and won't seal the jet.
|
|
Brian.
Better 5 minutes late in this world than years early in the next. |
|
Ken-Guzzibear
Moderator Group Joined: 13 May 2014 Location: Sileby Leics Status: Offline Points: 9454 |
Post Options
Thanks(0)
|
I start 2.5 to 2.75 you can hear it as much as anything 1.5 turns is the starting point make sure the engine is well warm or once set then when warm the tickover will race to say the least and yeh left and right are different Brian is correct tho the choke does need to be checked the end and the ring seal on the top edge do fail
|
|
The Older i Get, The Better I Was
|
|
Dave P.
Senior Member Joined: 12 Jan 2015 Location: Northants Status: Offline Points: 5573 |
Post Options
Thanks(0)
|
I noticed you refer to the "air mixture screw" On the older guzzi's with VHB's or PHF's that's a fuel metering screw. I just thought I'd mention it incase you are more used to Amal's which do have air screws and work in the opposite direction to Dellorto's.
|
|
TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.
1971 V7 Special. 1972 850GT. 1970 T120 Bonnie. 2009 500 Bullet. |
|
Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
Post Options
Thanks(0)
|
Of course the Dellorto "choke" works the opposite way to Amals too, it adds extra fuel rather than reducing the air.
|
|
Brian.
Better 5 minutes late in this world than years early in the next. |
|
Dave P.
Senior Member Joined: 12 Jan 2015 Location: Northants Status: Offline Points: 5573 |
Post Options
Thanks(0)
|
True true,unless the Amal's a mark two.
|
|
TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.
1971 V7 Special. 1972 850GT. 1970 T120 Bonnie. 2009 500 Bullet. |
|
Mike H
Senior Member Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 8733 |
Post Options
Thanks(0)
|
The 1.5 turns out often leads to confusion, what it's actually saying is, when setting up carb settings start with 1.5 turns out, from fully screwed in; you then try getting the bike to idle and normally need to unscrew them a bit more so it idles without stalling. 2.5 turns as a final is common.
Note carbs must be clean, properly jetted, working perfectly, ignition timing perfect, etcetera. Else flogging a dead horse. Your sooty plug is not likely to be just cos a carb has "gone off tune a bit". Indicates a bit more to it. Start by complete carburettor stripdowns, clean, overhaul kits, new choke plungers, etc. EDIT: don't forget to also check needles for wear and correct number and position, state of needle jet, etc. Modern petrol wreaks havoc on carbs internals these days I'm afraid, with sometimes massive deposits of rock-hard crud literally bunging thing up, last time I had to have all new jets. NB: after doing so, the ideal idle screw position was indeed 1.5 turns, moreover the choke had to be left alone completely unless weather was really cold for starting, or it just flooded, so that's how much the original jets were partially blocked. . Edited by Mike H - 11 Jan 2017 at 15:26 |
|
"Chicken nuggets don't dance on a Tuesday."
|
|
Post Reply | |
Tweet
|
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |