Author Topic: Engine having a hissy fit  (Read 593 times)

Online a101960

  • Wise & Enlightened
  • *
  • Join Date: Sep 2007
  • Posts: 1041
  • Karma: 12
  • BSA RGS BSA C12
Engine having a hissy fit
« on: 09.07. 2017 19:32 »
Went out this afternoon and the engine cut. I had been riding for no more than 5 minutes when I stopped to pop into a shop. When I went to restart the engine uncharacteristically it took about 10 kicks to get it going again. Normally it is a first or second kick starter. Anyway, I had not gone more than about a quater of a mile when the engine cut. I kicked, and kicked, and kicked, but it was having none of it. As luck would have it this incident happened not far from a a fairly steep downward gradient so I pushed the bike to the start of the gradient, got on the bike and got it rolling. After two or three attempts coasting down the hill and letting the clutch out in gear it fired and kept on running. I decided discretion being the better part of valour, it would be wise to abandon the ride and return home. On arriving home, I killed the engine and tried restarting it to see what would happen. Would you believe it started first kick, so I repeated the exercise several times, and it started first kick every time! Out of curiosity I removed the plugs and found that they were black and sooty. Any suggestions as to what was going on? Mag dropping a hint that it was getting tired and needs attention perhaps? Stuck float causing flooding? All very strange. By the way I tried starting the bike when I got home before I checked the plugs.
John
Good Advice
0
No reactions

Online Greybeard

  • Jack of all trades; master of none.
  • Wise & Enlightened
  • *
  • Join Date: Feb 2011
  • Posts: 6388
  • Karma: 35
Re: Engine having a hissy fit
« Reply #1 on: 09.07. 2017 19:50 »
I had something like this that turned out to be a blocked fuel tank vent.


The sooty plugs might be due to your attempts to start the engine.
Good Advice
0
No reactions

Online a101960

  • Wise & Enlightened
  • *
  • Join Date: Sep 2007
  • Posts: 1041
  • Karma: 12
  • BSA RGS BSA C12
Re: Engine having a hissy fit
« Reply #2 on: 09.07. 2017 19:57 »
Quote
I had something like this that turned out to be a blocked fuel tank vent.
Thanks for the suggestion Greybeard but unlikely because it is an RGS tank with the big vent pipe. I'm not saying it couldn't be, just unlikely.
Good Advice
0
No reactions

Online Greybeard

  • Jack of all trades; master of none.
  • Wise & Enlightened
  • *
  • Join Date: Feb 2011
  • Posts: 6388
  • Karma: 35
Re: Engine having a hissy fit
« Reply #3 on: 09.07. 2017 22:48 »
It was very hot, (here) today: might the problem have been fuel boil-off?
Good Advice
0
No reactions

Offline Tomcat

  • Valued Contributor
  • ****
  • Join Date: May 2011
  • Posts: 400
  • Karma: 2
Re: Engine having a hissy fit
« Reply #4 on: 10.07. 2017 08:23 »
Possibly a warm engine. Not cold where you would flood it and not hot where you don't.
Good Advice
0
No reactions
'48 A7 '59 SR '74 850 Commando TDM900

Online a101960

  • Wise & Enlightened
  • *
  • Join Date: Sep 2007
  • Posts: 1041
  • Karma: 12
  • BSA RGS BSA C12
Re: Engine having a hissy fit
« Reply #5 on: 10.07. 2017 10:04 »
Quote
It was very hot, (here) today: might the problem have been fuel boil-off?
Yes that did cross my mind too, but I have an insulator fitted between the carb and the manifold.
Good Advice
0
No reactions

Offline duTch

  • Ricketty Rocketty Golden Flashback
  • Wise & Enlightened
  • *
  • Join Date: Oct 2011
  • Posts: 4540
  • Karma: 41
Re: Engine having a hissy fit
« Reply #6 on: 10.07. 2017 10:09 »

 
Quote
It was very hot, (here) today: might the problem have been fuel boil-off?

  *eek*

 How Hot ?
Good Advice
0
No reactions
Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
Australia

Online Greybeard

  • Jack of all trades; master of none.
  • Wise & Enlightened
  • *
  • Join Date: Feb 2011
  • Posts: 6388
  • Karma: 35
Re: Engine having a hissy fit
« Reply #7 on: 10.07. 2017 10:23 »

 
Quote
It was very hot, (here) today: might the problem have been fuel boil-off?

  *eek*

 How Hot ?

Far far hotter than anywhere else in the world that you might be thinking of duTch! Actually the roads were melting and sliding off into the ditches. True!
Good Advice
0
No reactions