So the carbs have arrived, so that i have it right:
1: Fuel In
2: Float bowl drain/overflow
3: Diaphragm Breathers as on the 3VD Carbs
4: Fuel Overflow / Breather
5: ????
Cant figure out how to post an image so :
https://www.flickr.c...eposted-public/
https://www.flickr.c...eposted-public/
Thanks All!
Poor Fuel Economy, Even After New Emulsion Tubes
Started by
Naur
, May 13 2016 07:16 am
46 replies to this topic
#41
TDMberlin
-
- Member
- 7 posts
arrived on last train
- TDM model: 1994
Posted 22 May 2025 - 12:25 pm
#42
TDMberlin
-
- Member
- 7 posts
arrived on last train
- TDM model: 1994
Posted 30 May 2025 - 09:10 am
Had the carbs apart yesterday and cant see how to remove the Needle Jet/Emulsion Tube. Unlike the 3VD carbs there inst a plastic insert in the carb body and from below there is a jet in the body next to the emulsion tube and i cant remove that either? It appers to thread in but it looks like there is a C clip in there or something.
HELP!
#43
dapleb
-
- Root Admin(A)
-
- 18,328 posts
Monkey Boy
- Location:The home of morris dancin
- TDM model: 1990
Posted 30 May 2025 - 09:36 am
If ewe is talking about late mk2 carbs, I think they are press fit in / not easily removed. Though i think kedo list replacement toobs so guess it's possible.
Too modern for me. One of the few 850 parts I have never owned/examined.
Studley and some udders will know... hopefully along soon with useful info.
Too modern for me. One of the few 850 parts I have never owned/examined.
Studley and some udders will know... hopefully along soon with useful info.
"Whats up", "Piston Broke", "Yeah me too...hic"
If you want to mark your location on the Carpe map: http://www.carpe-tdm...opic.php?t=5117
Doin valve clearances? Use dappers valve shim exchange program and the job will be carroty - Free (other than you postin me yer shims) for sporting members.
Active member of TPLQHCSRSFC and TSRMCMAS (even though a year off) and avid fan of PM not sent.
If you want to mark your location on the Carpe map: http://www.carpe-tdm...opic.php?t=5117
Doin valve clearances? Use dappers valve shim exchange program and the job will be carroty - Free (other than you postin me yer shims) for sporting members.
Active member of TPLQHCSRSFC and TSRMCMAS (even though a year off) and avid fan of PM not sent.
#44
TDMberlin
-
- Member
- 7 posts
arrived on last train
- TDM model: 1994
Posted 30 May 2025 - 02:04 pm
Ok, found a similar question on a German Forum. They are pressed in and basically you cut a thread into them, insert a bolt and pull them out. Obviously they are scrap after this.
So for now i'll leave them in.
My 3VD carbs had a 140 main jet, these have a 155. So...... fit the 140s to this carb or is the carb construct such that there is no coralation between BDST and BDSR carbs?
Thanks as always.
Chris
#45
Studley Ramrod
-
- Root Admin(A)
-
- 19,363 posts
Monkey Boys Monkey
- Location:HELLO ! I'm in the Library...Notts
- TDM model: 1993
Posted 31 May 2025 - 09:27 am
Factory Pro needles, there stepped iirc and are really more suitable to a lightly tuned engine. Try stock needles.
Mk2a 2000 in Silver. Top end Refurb @ 41100 miles, Scottoiler, Renthal Road High Bars, Up & Back Bar Risers, Bellypan, DL650 Handguards, Capt. Picard Bar Ends, House of Henty SS Wheel spacers, New Seat Cover Fitted. 58 MPG !! Now owned by chrisbee ! Studley's mk2a Bloggerydoodaah ! Photos of my first MK1 Photos of my MK2a TPLQHCSRSFC No. 1 Fan
#46
Bjørge
-
- Supporting Member(thanks)
-
- 1,860 posts
has been here 4ever
- Location:Asker, Norway
- TDM model: no more
Posted 31 May 2025 - 11:21 am
Ok, found a similar question on a German Forum. They are pressed in and basically you cut a thread into them, insert a bolt and pull them out. Obviously they are scrap after this.
So for now i'll leave them in.
My 3VD carbs had a 140 main jet, these have a 155. So...... fit the 140s to this carb or is the carb construct such that there is no coralation between BDST and BDSR carbs?
Thanks as always.
Chris
When I swapped the 3VD carbs for the Mk2a ones it was because reports suggested the later ones rarely required servicing. Are you sure they need fettling?
Bjørge
#47
TDMberlin
-
- Member
- 7 posts
arrived on last train
- TDM model: 1994
Posted 01 June 2025 - 09:42 am
Thanks all!!!
the carbs on the bike are OK, work well enough, but do have issues related to fuel consumption. Despite new Needles, Tubes and Choke plungers - which are metal not plastic on the MK2a carbs.
Having read here that the MK2a carbs are superior and so cheap to buy that they'll pay for themselves in saved fuel .... is my motivation. The carbs i bought for 50 Euro are extremley clean inside. They are split and broken down into as many components as is possible without breaking anything so will get "ultrasounded" as a matter of course.
I'll compare and measure all 3 needle sets, 3VD / FP / MK2a and hopefully have a little more insight. I'll start with the 140 Main too.
0 user(s) are reading this topic
0 members, 0 guests, 0 anonymous users
