Author Topic: Difficult starting  (Read 427 times)

Offline agonda1

  • Moving Up
  • **
  • Join Date: Apr 2015
  • Posts: 20
  • Karma: 0
Difficult starting
« on: 08.06. 2016 20:46 »
1959 g/flash - starts easily from cold and runs perfect.Try to start again after say 20mins and it's very difficult but eventually will burst into life , but only then when throttle is open wide.Mag has been re-conditioned,timing correct,carb settings correct and no air leaks - what's going on ?Problem has existed for 2 years - plugs do seem a bit sooty

Jim

Online muskrat

  • Global Moderator
  • Wise & Enlightened
  • **
  • Join Date: Jul 2009
  • Posts: 8503
  • Karma: 112
  • Lithgow NSW Oz
    • Shoalhaven Classic Motorcycle Club Inc
Re: Difficult starting
« Reply #1 on: 08.06. 2016 21:32 »
G'day Jim.
Sounds rich to me. Re-check the float height. Try a hotter plug.
But as most carb problems are electrical and vise versa it could be the condenser.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Offline agonda1

  • Moving Up
  • **
  • Join Date: Apr 2015
  • Posts: 20
  • Karma: 0
Re: Difficult starting
« Reply #2 on: 08.06. 2016 21:47 »
Good thoughts.Mag has been overalled - could a condensor have been overlooked ? - will contact said person to query
Lived in Canberra 1n the late 1970's.Had a couple of bikes over there - honda cl350 and suzuki 350 gt triple = both went well
Regards
jim

Online Triton Thrasher

  • Scotland
  • Wise & Enlightened
  • *
  • Join Date: Feb 2009
  • Posts: 1550
  • Karma: 20
Re: Difficult starting
« Reply #3 on: 09.06. 2016 14:31 »
Forgetting to replace the condenser when rewinding the magneto sounds unlikely.


If the plugs are getting sooty, I think everything in the carb is not correct.

Always suspect a worn needle jet.

Offline agonda1

  • Moving Up
  • **
  • Join Date: Apr 2015
  • Posts: 20
  • Karma: 0
Re: Difficult starting
« Reply #4 on: 09.06. 2016 19:26 »
all jets + needle are new - just today i made non standard adjustment and things have improved including colour of plug  :-
needle groove no 2 - pilot screw out 4 turns

Online chaterlea25

  • Wise & Enlightened
  • *
  • Join Date: Jun 2009
  • Posts: 3368
  • Karma: 48
Re: Difficult starting
« Reply #5 on: 09.06. 2016 19:58 »
Hi,
Make sure the plugs and caps are non resistor types
There are /were a lot of poor quality condensers being fitted by mag reconditioners  *sad2*
These usually fail totally though  *????*

4 turns out is way outside the adjustment range *eek*
Presuming a monobloc carb? is the pilot jet tightened fully home before the cap is threaded on ??

John
1961 Super Rocket
1963 RGS (ongoing)