Author Topic: What does this missing part do?  (Read 261 times)

Online CallMeSteve

  • STrudel, Steve and Ruth.
  • Sr. Member
  • ****
  • Posts: 337
  • Thanked: 130 times
  • Eatons Hill, Brisbane.
What does this missing part do?
« on: October 02, 2019, 07:34:39 PM »
STrudel went in to Brisbane Honda this week for his 42k service. I asked them to look into why he was running very lumpy and rough, and I demonstrated my knowledge by suggesting that maybe the throttle bodies needed syncing.  8)

A few hours after leaving the bike I got a call. Yeah the throttle bodies were way out, but there was also a thingamebob missing from the doo-Hickey attached to one of the widgets. They fitted a replacement thingamebob and showed me a photo. See the attached photo.  Looks like a previous mechanic was sloppy to say the least.

Can anyone explain in plain English what the missing thingamebob does?
A man rides on his STeed, says “Why am I short of attention? Got a short little span of attention”.

You can call me Steve, with apologies to Paul Simon.

 :wht13

current:
ST1300 2014 Police

pre-kids:
CX500
CB900
CB400NB
CB350
1964 Yamaha YG-1 80cc
 

Online Jdbiker

  • Supreme "2000" Club Member
  • *****
  • Posts: 2000
  • Thanked: 640 times
  • ST Legend
Re: What does this missing part do?
« Reply #1 on: October 02, 2019, 09:21:02 PM »
Looks like the starter valve screw🤓
Jdbiker.
2008 red ST1300A
1980 Yamaha XS 1100
1974. Yamaha TX 500
1984   Kawasaki GT 750
Honda XL 250
Suzuki TS 100
2000 Honda ST1100P
 
The following users thanked this post: CallMeSteve

Online CallMeSteve

  • STrudel, Steve and Ruth.
  • Sr. Member
  • ****
  • Posts: 337
  • Thanked: 130 times
  • Eatons Hill, Brisbane.
Re: What does this missing part do?
« Reply #2 on: October 03, 2019, 07:19:37 AM »
Well thank you, kind sir.  :-++

Any guesses as to the effect of the missing bush and nut?
A man rides on his STeed, says “Why am I short of attention? Got a short little span of attention”.

You can call me Steve, with apologies to Paul Simon.

 :wht13

current:
ST1300 2014 Police

pre-kids:
CX500
CB900
CB400NB
CB350
1964 Yamaha YG-1 80cc
 

Online Jdbiker

  • Supreme "2000" Club Member
  • *****
  • Posts: 2000
  • Thanked: 640 times
  • ST Legend
Re: What does this missing part do?
« Reply #3 on: October 03, 2019, 07:59:12 AM »
I haven’t delved that deep into my ST but that is the adjustment screw and if missing would definitely cause an imbalance between the four cylinders.
Jdbiker.
2008 red ST1300A
1980 Yamaha XS 1100
1974. Yamaha TX 500
1984   Kawasaki GT 750
Honda XL 250
Suzuki TS 100
2000 Honda ST1100P
 
The following users thanked this post: CallMeSteve

Online Jdbiker

  • Supreme "2000" Club Member
  • *****
  • Posts: 2000
  • Thanked: 640 times
  • ST Legend
Re: What does this missing part do?
« Reply #4 on: October 03, 2019, 08:17:39 AM »
Would be interesting to know the difference after the bits were replaced?
Jdbiker.
2008 red ST1300A
1980 Yamaha XS 1100
1974. Yamaha TX 500
1984   Kawasaki GT 750
Honda XL 250
Suzuki TS 100
2000 Honda ST1100P
 

Online Biggles

  • NatRally 2018 - Mackay
  • "Top Dog" 10000 club
  • *
  • Posts: 13025
  • Thanked: 1654 times
  • Bridgeman Downs, Brisbane
Re: What does this missing part do?
« Reply #5 on: October 03, 2019, 09:23:58 AM »
Any guesses as to the effect of the missing bush and nut?

A nut like that would normally be a lock nut, but being halfway up the thread doesn't make sense unless it's working against what appears to be a black sleeve.  Might the original have vibrated out if there was no lock nut?
Still waiting for a better explanation.  Alan might be along soon with an exploded parts diagram...
For the modern man who lives in the city, riding a bike might be one of the only ways to escape the humdrum monotony. To take off and ride. To be both at one with nature and one with the bike. To feel masculine. Adam Piggott

OzSTOC #16  STOC #6135  FarR #509  IBA #54927
 
The following users thanked this post: CallMeSteve

Online CallMeSteve

  • STrudel, Steve and Ruth.
  • Sr. Member
  • ****
  • Posts: 337
  • Thanked: 130 times
  • Eatons Hill, Brisbane.
Re: What does this missing part do?
« Reply #6 on: October 03, 2019, 09:35:22 AM »
Would be interesting to know the difference after the bits were replaced?

The difference is astonishing. I'd gone to a bit of trouble shortly after I got the bike to smooth out the rough low-throttle response which seems to be characteristic of STs. I had a Bazzaz ZFI installed, and got myself a silky smooth throttle response on low throttle and all the way down to idling revs. That silky smoothness that I paid so much for is now back  :runyay

It now also idles nicely whether hot or cold. Plus, I think the fuel consumption is back to 'normal' as in 5-ish l/100k rather than 6-ish, although probably a bit early to tell for sure. It had been chewing extra gas for some time, so this might save me some dollars on our upcoming Melbourne trip.

Mind you there were two issues coz they also balanced the bodies and said they were way out.  The last time they were balanced was at 12k, and now i'm at 42k.

A man rides on his STeed, says “Why am I short of attention? Got a short little span of attention”.

You can call me Steve, with apologies to Paul Simon.

 :wht13

current:
ST1300 2014 Police

pre-kids:
CX500
CB900
CB400NB
CB350
1964 Yamaha YG-1 80cc
 
The following users thanked this post: Jdbiker

Online alans1100

  • 1999 ST1100A
  • RTE Coordinator
  • UNBELIEVABLE "5000 Posts" Member
  • *
  • Posts: 6234
  • Thanked: 1129 times
  • Alan, Peterborough, SA
Re: What does this missing part do?
« Reply #7 on: October 03, 2019, 10:12:13 AM »

Still waiting for a better explanation.  Alan might be along soon with an exploded parts diagram...
The only item that looks anything like what is in the image is item 8 from here. https://www.partzilla.com/catalog/honda/motorcycle/2005/st1300a-a-st1300a/throttle-body-comp

It says starter valve of which there are four.
1999 :bl11  2004 :13Candy

FarRider #921- BR15, BR17, CR1

 
The following users thanked this post: Jdbiker, CallMeSteve

Online Jdbiker

  • Supreme "2000" Club Member
  • *****
  • Posts: 2000
  • Thanked: 640 times
  • ST Legend
Re: What does this missing part do?
« Reply #8 on: October 03, 2019, 04:35:11 PM »
Doesn’t show the adjusting nut and bush, tightening or loosening the nut must adjust the spring loaded plunger thingy (no8) in the starter valve effecting the volume of air . Might have a look next I have the air box off👍🤓
Jdbiker.
2008 red ST1300A
1980 Yamaha XS 1100
1974. Yamaha TX 500
1984   Kawasaki GT 750
Honda XL 250
Suzuki TS 100
2000 Honda ST1100P
 
The following users thanked this post: Nigel, CallMeSteve

Offline West Aussie Glen

  • old fart
  • Supreme "2000" Club Member
  • *****
  • Posts: 2374
  • Thanked: 323 times
  • Willetton, Perth
Re: What does this missing part do?
« Reply #9 on: October 03, 2019, 05:01:21 PM »
This looks more like Steves photo:-

http://partsfinder.onlinemicrofiche.com/wingstuff/showmodel.asp?type=13&make=hondamc&a=1352

but from it you would go back to Alans suggest that it is part of item 8.

A similar view:-

http://partsfinder.onlinemicrofiche.com/wingstuff/showmodel.asp?type=13&make=hondamc&a=1352
Glen
Safe Riding
Sold
1948 James 98cc 2 Speed, 1969 Suzuki A100-2
1970 Suzuki T250 Hustler, Honda CL100 (125cc)
Yamaha RD250C, 1985 Kawasaki GPZ250
BMW K75S, 78 Yamaha XS11
Yamaha Royal Star Tour Deluxe, 88 GL1500, 99 SE
GL1500
In the shed
85 Kawasaki  LTD250
88 GL1500 Outfit
08 ST1300
2013 GL1800
 
The following users thanked this post: Jdbiker, CallMeSteve

Online alans1100

  • 1999 ST1100A
  • RTE Coordinator
  • UNBELIEVABLE "5000 Posts" Member
  • *
  • Posts: 6234
  • Thanked: 1129 times
  • Alan, Peterborough, SA
Re: What does this missing part do?
« Reply #10 on: October 03, 2019, 08:01:45 PM »
Doesn’t show the adjusting nut and bush, tightening or loosening the nut must adjust the spring loaded plunger thingy (no8) in the starter valve effecting the volume of air . Might have a look next I have the air box off👍🤓
I had a look in the workshop manual and the parts that were missing are related to adjusting the starter valve which is set at the factory and according to the manual should not be touched or it can cause throttle and idle valve synchronisation failure.
1999 :bl11  2004 :13Candy

FarRider #921- BR15, BR17, CR1

 
The following users thanked this post: CallMeSteve

Online alans1100

  • 1999 ST1100A
  • RTE Coordinator
  • UNBELIEVABLE "5000 Posts" Member
  • *
  • Posts: 6234
  • Thanked: 1129 times
  • Alan, Peterborough, SA
Re: What does this missing part do?
« Reply #11 on: October 03, 2019, 08:09:31 PM »
This looks more like Steves photo:-

http://partsfinder.onlinemicrofiche.com/wingstuff/showmodel.asp?type=13&make=hondamc&a=1352

but from it you would go back to Alans suggest that it is part of item 8.

A similar view:-

http://partsfinder.onlinemicrofiche.com/wingstuff/showmodel.asp?type=13&make=hondamc&a=1352
The throttle body assembly does show the complete starter valve assembly but the parts list for the components (page I linked to earlier) doesn't show the lock nut and bush (??) items; I'm guessing that it comes as a set and is not something that one would usually need to replace.
1999 :bl11  2004 :13Candy

FarRider #921- BR15, BR17, CR1

 
The following users thanked this post: CallMeSteve

Online CallMeSteve

  • STrudel, Steve and Ruth.
  • Sr. Member
  • ****
  • Posts: 337
  • Thanked: 130 times
  • Eatons Hill, Brisbane.
Re: What does this missing part do?
« Reply #12 on: October 04, 2019, 04:15:10 PM »
Fuel consumption is looking good.  I went for a 150k round trip today - pure highway - and returned 5.0l/100k, which is what I used to get in the 'old days'. For the last year it's never gone below 6l/100k even on the highway.  Happy camper :-)
A man rides on his STeed, says “Why am I short of attention? Got a short little span of attention”.

You can call me Steve, with apologies to Paul Simon.

 :wht13

current:
ST1300 2014 Police

pre-kids:
CX500
CB900
CB400NB
CB350
1964 Yamaha YG-1 80cc
 
The following users thanked this post: Jdbiker