Author Topic: RD125 Teikie TK18 carb overhaul  (Read 1414 times)

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Offline Johncb500

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Re: RD125 Teikie TK18 carb overhaul
« Reply #30 on: June 11, 2018, 08:28:40 PM »
you got the little felt cam lube pad in there John? pump oil into it!
great its now revving out.
running mine in at the moment, engine very tight.

I have been using High melting point grease ,but I can use engine oil on the pad,thanks
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Offline Johncb500

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Re: RD125 Teikie TK18 carb overhaul
« Reply #31 on: June 14, 2018, 05:05:15 PM »
  interesting developement,

  all carb settings as normal,including filters ,
 

 after running last time ,the RH pot was perfect,LH was grey.


 so I checked timing,turns out the RH was slightly more advanced than reccomened ,but it ran beautifully,
so I set the lh pot the same ,not using a dial gauge,but the marks on the stator ,,it worked out about 4mm before the indicator ,checked using a bulb ,

 result,it runs and screams out the revs ,as I remember ,revs hard,even seems to pull lower down,


 I am taking care not to get detination,and piston burning,if I feel its getting to hot,I may try B9hs plugs ,

 but I am cautiously happy ,its a rev hungry nut twin,just as I remember

 more news as it comes

  another thought,is modern petrol different from early 70's stuff,?  does it have a slower burn rate ? I know Spa MC in Cheltenham say they mod the motors for modern fuels ,
 do we have a chemist? or petro-chemical engineer on the site that can explain ?



  after asking Mr Google,I found a U S A based article ,that seems to explain about tuning older motors using modern fuel,
 check this link,and comment please

   https://www.hemmings.com/magazine/hcc/2012/04/Give-it-the-gas-/3711201.html
« Last Edit: June 14, 2018, 05:28:02 PM by Johncb500 »
lifelong rider,laterly with Honda,now a little RD as well

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Offline 5port

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Re: RD125 Teikie TK18 carb overhaul
« Reply #32 on: June 14, 2018, 05:30:53 PM »

  interesting developement,

  all carb settings as normal,including filters ,
 

 after running last time ,the RH pot was perfect,LH was grey.


 so I checked timing,turns out the RH was slightly more advanced than reccomened ,but it ran beautifully,
so I set the lh pot the same ,not using a dial gauge,but the marks on the stator ,,it worked out about 4mm before the indicator ,checked using a bulb ,

 result,it runs and screams out the revs ,as I remember ,revs hard,even seems to pull lower down,


 I am taking care not to get detination,and piston burning,if I feel its getting to hot,I may try B9hs plugs ,

 but I am cautiously happy ,its a rev hungry nut twin,just as I remember

 more news as it comes

  another thought,is modern petrol different from early 70's stuff,?  does it have a slower burn rate ? I know Spa MC in Cheltenham say they mod the motors for modern fuels ,
 do we have a chemist? or petro-chemical engineer on the site that can explain ?

Great.  As far as running 9's, why not? They are a colder running plug and that is safe.  The worst that can happen is they oil up.
As far as fuel goes,...It is all different and always has been!  It is always a mix that just conforms to the standards set, which is Octane level, ie resistance to detonation.  More recently, there are limits on lead, sulphur, water and Ethanol etc.  I set my bikes to original spec but, I am careful not to run any advance beyond the stock figure and, I stick to Premium unleaded.
BTW, not claiming special knowledge on this.  ;)

5port
5port

Offline Johncb500

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Re: RD125 Teikie TK18 carb overhaul
« Reply #33 on: June 15, 2018, 04:23:19 PM »



  went for a run today,after a quick run,and plug chop,plugs not to bad the LH pot still running cooler ,

 then a run on various twisty roads ,running between 5 and 9,5 K rpm the motor seemed to feel better ,

 ever passed a few cars ,screaming in 3rd,4th and top ,

 then a nice BLAST down a slight slope ,holding 9.5K in top at over 70mph indicated ,maybe clearing out the old pipes .

 quick check when I got back,the LH points may have closed slightly,so opened them to match the RH set.

 plug pic,the RH plug is on the left !!!!
lifelong rider,laterly with Honda,now a little RD as well

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Offline Motty

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Re: RD125 Teikie TK18 carb overhaul
« Reply #34 on: June 15, 2018, 05:06:10 PM »
My thoughts (FWTAW)

RH plug okay (touch weak perhaps)
LH plug a little bit rich

As always with this type of question, it will be interesting what everyone else thinks
“...inside every old person is a young person wondering what the f*@k happened.”
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Offline Johncb500

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Re: RD125 Teikie TK18 carb overhaul
« Reply #35 on: June 15, 2018, 08:41:15 PM »
right plug OK a tad rich, I would be happy to use like that.

left plug too lean for sure IMO,

I did try to tell you how to do the plug check, look back through the posts, you can't just check the colour for for hole rev range with 1 plug check, you need to do it for each rev range individually to get it correct.

Motty did you mean the other left and the other right ?

  interesting,the mid range and slow is running well,he hi-load hi-speed run is the most dangerous,if it is to lean,it will
burn the piston at high speed,that plug chop was 1/2 mile up a slight hill at full throttle around 9K in 4th.


  as for the colour,I think the lighter plug was perfect,
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Offline Phil Featherstone

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Re: RD125 Teikie TK18 carb overhaul
« Reply #36 on: June 15, 2018, 09:31:53 PM »
I would say RH cylinder (left in pic if I got that right) good depending on oil being used and LH cylinder to rich.
PFP Phil
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RD200 2R7 Red NEW build 8years and counting collecting parts
RD200 2R7 Resto in progress
RD125 1976 project

Offline Phil Featherstone

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Re: RD125 Teikie TK18 carb overhaul
« Reply #37 on: June 15, 2018, 09:52:15 PM »
Personally I would be worried about the colour of the plug on the left in the pic for long term high revving road use.
But happy with the plug on the right that's darker in colour, but may be a tad rich, hard to tell from the pic of that plug.
IMO.

I would say its a case of the owner knowing what works for him and his bike. I would always  air on the rich side if there is a question.
As you say Tony difficult to be sure from a picture.
PFP Phil
www.pfpservices.co.uk
RD200 2R7 Red NEW build 8years and counting collecting parts
RD200 2R7 Resto in progress
RD125 1976 project

Offline Motty

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Re: RD125 Teikie TK18 carb overhaul
« Reply #38 on: June 15, 2018, 10:07:18 PM »
Motty did you mean the other left and the other right ?

I think so, I think the left plug in the photo was from the RH cylinder

I very much agree with Phil F comment, (nowadays) I would rather run a touch rich as the bike will run cooler and less likely to hole a piston. The LH plug in the photo (RH cylinder) would have me upping the jet or checking for an air leak

If John did the plug chop running the bike up slight hill on 3/4 throttle, that is the way I would do it as well

It is interesting the different opinions that people have regarding the plugs in the photos
« Last Edit: June 15, 2018, 10:11:19 PM by Motty »
“...inside every old person is a young person wondering what the f*@k happened.”
Terry Pratchett

Offline Phil Featherstone

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Re: RD125 Teikie TK18 carb overhaul
« Reply #39 on: June 15, 2018, 10:30:40 PM »
quote   plug pic,the RH plug is on the left !!!! ;) ;)
PFP Phil
www.pfpservices.co.uk
RD200 2R7 Red NEW build 8years and counting collecting parts
RD200 2R7 Resto in progress
RD125 1976 project

Offline Phil Featherstone

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Re: RD125 Teikie TK18 carb overhaul
« Reply #40 on: June 15, 2018, 11:46:13 PM »
I found a nice little chart for you to look at, its about the 11th post down this thread  http://www.apriliaforum.com/forums/showthread.php?253881-Sparkplug-Color!     Check it out, but it all depends on the light of the photos as to what you see, it gives a good idea of what you should be looking for.
I will leave you to it now as you have all the info you need, good luck.


Nice one Tony ;)
PFP Phil
www.pfpservices.co.uk
RD200 2R7 Red NEW build 8years and counting collecting parts
RD200 2R7 Resto in progress
RD125 1976 project

Offline Johncb500

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Re: RD125 Teikie TK18 carb overhaul
« Reply #41 on: June 16, 2018, 11:00:15 AM »
I found a nice little chart for you to look at, its about the 11th post down this thread  http://www.apriliaforum.com/forums/showthread.php?253881-Sparkplug-Color!     Check it out, but it all depends on the light of the photos as to what you see, it gives a good idea of what you should be looking for.
I will leave you to it now as you have all the info you need, good luck.


  thanks Tony,that chart is ideal,
I will continue to monitor the running and plugs to see how it developes,
lifelong rider,laterly with Honda,now a little RD as well

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Offline Johncb500

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Re: RD125 Teikie TK18 carb overhaul
« Reply #42 on: June 22, 2018, 03:34:31 PM »

  after a little fettling,setting the L/H pot to a setting closer to the R/H pot,

 and a 25mile run around ,with 100% acceleration up to 9.5K as well as cruising between 7K and 8K in normal traffic ,
the motor seemed really happy,hardly any vibration,clean pickup at all speeds ,
this is the plug colour when I got home ,seems good to me BTW,the right plug is R/H and L/H is left ot !!!

I remembered this time
« Last Edit: June 22, 2018, 03:36:07 PM by Johncb500 »
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Offline petermigreen

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Re: RD125 Teikie TK18 carb overhaul
« Reply #43 on: June 22, 2018, 05:20:46 PM »
Oh it must be a triple, there's a middle plug!
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Offline Johncb500

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Re: RD125 Teikie TK18 carb overhaul
« Reply #44 on: June 22, 2018, 09:19:24 PM »
Oh it must be a triple, there's a middle plug!



  SSSHHHHSSSSSSSSSSSSSSSSSSS    don't tell everyone

 it may be a spare !!  something every 2 stroke rider should carry,it garrantees you never use it !!!
lifelong rider,laterly with Honda,now a little RD as well

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