Oil in spark plug wells. Bike won't start.

Singles, twins and fours.
graylee
Posts: 29
Joined: Wed Oct 10, 2018 5:42 pm
Contact:

Oil in spark plug wells. Bike won't start.

Postby graylee » Mon Sep 30, 2019 5:59 pm

Hi,
Went to start my bike today and couldn't. It's new to me but not had a problem before. (Only had it a couple of weeks).
I proceeded to check the plugs and noticed one of them had quite a bit of oil around the top of it, prior to undoing it. In the spark plug "well" on top of the head.

I am thinking that a gasket somewhere (rocker cover?) is leaking.

Probably nothing to do with that, but would whatever caused the oil also prevent the bike starting?

I have a good spark. (It has an electronic ignition). And there is fuel getting through as after kicking it for a while the plugs are flooded.

Was wondering if the oil problem has anything to do with a loss of compression?

Cheers
Lee
AOMCC Membership No. 6993
Proud owner of an Ariel Cyclone.

User avatar
Steven.Carter
Holder of a Golden Anorak
Holder of a Golden Anorak
Posts: 3578
Joined: Mon Feb 28, 2011 4:45 am
Location: Eastleigh, Hampshire
Contact:

Re: Oil in spark plug wells. Bike won't start.

Postby Steven.Carter » Mon Sep 30, 2019 6:17 pm

Hi Lee, you don't have to have a whole lot of compression for it to go. I'd get the plugs out and give them a good clean.

Wherabouts in the UK are you?

graylee
Posts: 29
Joined: Wed Oct 10, 2018 5:42 pm
Contact:

Re: Oil in spark plug wells. Bike won't start.

Postby graylee » Mon Sep 30, 2019 6:33 pm

Hi Steve,

West Suffolk. What do you think about the oil puddle?
AOMCC Membership No. 6993
Proud owner of an Ariel Cyclone.

JohnnyBeckett
Holder of a Silver Anorak
Holder of a Silver Anorak
Posts: 948
Joined: Sat Jul 07, 2018 5:39 pm
Contact:

Re: Oil in spark plug wells. Bike won't start.

Postby JohnnyBeckett » Mon Sep 30, 2019 6:56 pm

do what Steven said take out pugs clean them give it a good kicking over with out the plugs in with petrol off and heat up the end of the plugs and put the plugs in wen hot and start it the oil on the top will not stop it starting make sure the plugs are good and the right ones and make the sure gaps are ok
Last edited by JohnnyBeckett on Mon Sep 30, 2019 7:08 pm, edited 2 times in total.

Simon.Gardiner
Holder of a Silver Anorak
Holder of a Silver Anorak
Posts: 969
Joined: Tue Aug 02, 2011 11:37 pm
Location: South West (Bristol-ish)
Contact:

Re: Oil in spark plug wells. Bike won't start.

Postby Simon.Gardiner » Mon Sep 30, 2019 7:02 pm

Hi Lee
I'd check the rocker feed carefully (pipes/banjos/spindles etc) - it's quite easy for some part of it to loosen and start weeping, although if you're unlucky you might have a crack in the pipe (or in one of the joints).
Otherwise rocker box base gaskets, tappet cover gaskets - there are plenty of places oil can come out of around the top end!
(Loss of compression might be a tight tappet - something to look out for particularly if the rocker box gaskets are quite thick.....)

SG
'55 Huntmaster, '56 VH, ' 51 VH, '80 R100RT, '00 Sprint ST (but all those Ariel parts can only make one running bike...)

User avatar
Steven.Carter
Holder of a Golden Anorak
Holder of a Golden Anorak
Posts: 3578
Joined: Mon Feb 28, 2011 4:45 am
Location: Eastleigh, Hampshire
Contact:

Re: Oil in spark plug wells. Bike won't start.

Postby Steven.Carter » Mon Sep 30, 2019 7:31 pm

Those oil banjos often leak and need regular tightening till they settle down. Should have no effect on starting.

Steve

graylee
Posts: 29
Joined: Wed Oct 10, 2018 5:42 pm
Contact:

Re: Oil in spark plug wells. Bike won't start.

Postby graylee » Tue Oct 01, 2019 8:30 am

Thanks for the tips guys. I will do as suggested.
Regards
AOMCC Membership No. 6993
Proud owner of an Ariel Cyclone.

graylee
Posts: 29
Joined: Wed Oct 10, 2018 5:42 pm
Contact:

Re: Oil in spark plug wells. Bike won't start.

Postby graylee » Tue Oct 01, 2019 3:46 pm

Turns out the lack of starting was down to the electronic ignition!

I had been tracing a blown fuse earlier, and had opened the magneto cover to look at the wiring. (the electronic ignition is in there). Anyway, when replacing it I had it turned slightly from where it should have been. There are more than one locating lug, and I had it on the wrong one. This must have made the timing off. Rotated it it to the next lug position and she fired straight up!

I will now do as suggested to find the oil leak. Once the engine gets hot it is smoking from the oil on the cooling fins.

Cheers
Lee
AOMCC Membership No. 6993
Proud owner of an Ariel Cyclone.


Return to “Four stroke”

Who is online

Users browsing this forum: No registered users and 6 guests

cron