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D14 Starting problems
March 29, 2013
8:51 pm
nigelD3
Club Member 1394 - near London
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Well I ran up my bantam for the first time to day. The bottom end seems ok so I had just rebuilt the top end, new small end bearing, piston and rings. The engine started second kick, and revved ok for about 30 seconds….. then seized.dunno

 

I whipped the head off, and there was the piston halfway up the bore, with a gudgeon pin circlip stuck between the piston and the bore.ranting

 

Assuming that I had cocked –up with the assembly, I raised the barrel and check the circlips… both were still in place??embarassed

 

It appears that at some point in the life of this engine someone had lost a circlip in the crank… and it choose my rebuild to resurface….

o-m-g

 

So, I’m now left with a nice score on the barrel and on the piston …wondering what to do.dunno

 

If running with this damage means a lost of 10 or 20 % power, then I can live with that… should I try and do something with the marks? Or just leave them?

 

Has anyone had this problem before?

 

Thanks

Nigel.

March 30, 2013
9:50 am
lazybandittattoo
Club Member: 1659. Elland - West Yorkshire.
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September 29, 2011
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I lost a circlip in the crank on my D14. I was gutted. I found myself a magnetic pick up tool and tried to push it down in the gap but couldn’t get it. I very reluctantly turned the engine over slowly to give me a little more room and I was amazed to see the circlip stuck to a thin film of oil on the flywheel come up to the top. I am not normally so lucky.

 

Karma required balance though. A few weeks later my oil seals went and I had to take it all to bits anyway :)

March 30, 2013
10:43 am
nigelD3
Club Member 1394 - near London
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In the cold light of day, the mark on the barrel is not so bad, but the piston has had it I think

 

March 30, 2013
7:15 pm
BASIL
Club Member 874 Hamstreet,Ashford. Kent Area Rep.
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Definitly had it, thats a real bummer mate I have a B175 with broken rings and that wont run at all. Regards Basil. 

March 30, 2013
9:38 pm
Lone Wolf
Club Member 1657 The Black Country
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January 24, 2012
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nigelD3 said
Well I ran up my bantam for the first time to day. The bottom end seems ok so I had just rebuilt the top end, new small end bearing, piston and rings. The engine started second kick, and revved ok for about 30 seconds….. then seized.dunno

 

I whipped the head off, and there was the piston halfway up the bore, with a gudgeon pin circlip stuck between the piston and the bore.ranting

 

Wotcha.

 

 old Ah – many years ago, when I were but a lad ( OK, a lad of about 15 ) I bought a D14/4S.   The ol’ man had owned a D1 for a few years and he pulled the top end off this D14 in order to change the little end.  Most of the rollers from the Torrington little end bearing managed to fall into the crankcase.  

Now it was a case of “Do we split the engine, or do we fill the cases with paraffin and give it a good flushing?”  We chose the latter.  The top end was rebuilt with a new barrel and a new piston – the engine fired up second or third kick . . . . . and ran for less than 30 seconds before it stopped with an almighty crunch.  One needle roller had escaped and chose to make its exit via the transfer port.  One brand new barrel and piston were scrapped . . . . .  and I learned a very valuable lesson.

 

I feel your pain wink

^..^
March 30, 2013
10:32 pm
neddyo
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February 12, 2012
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I’ve run pistons with a lot more damage than that.

Smooth the piston with fine emery paper( I can hear the pedantic’s Going tut, tut, tut),

clean out the rings grooves, fit new piston rings and lightly hone the cylinder.

The new rings will give you all the compression you need and the little leakage

from the scour in the cylinder will not be an issue.

Trust me I’m a tree lover

March 31, 2013
10:29 am
nigelD3
Club Member 1394 - near London
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Thanks all for the support.

 

neddyo, this is what I needed to hear. The scratch on the barrel is mainly below the transfer port. The piston rings are now neatly riveted to the piston…. But if I’m going to fit new, then it doesn’t matter if I break them getting them out.

 

Thanks

Nigel.

thanks

March 31, 2013
11:29 pm
neddyo
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I use a piece of broken piston ring to clean out the ring grooves

April 1, 2013
1:37 pm
Hawaii50
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Basil wrote:

“I have a B175 with broken rings and that wont run at all”

Which shows that it’s the rings that provide most of the compression – get them un-“riveted” if possible without breaking and with everything fettled stick it all back together and I’m sure all will be well, and cheap!

Ride with a couple of fingers near that clutch lever just in case…

1950 D1 (Ex Hawaii!), 1936 Ariel 500 OHV, 1923 Raleigh Model 2 350 SV, Various bikes hidden from the Missus in sheds, under floorboards etc., etc., ...
April 1, 2013
4:36 pm
nigelD3
Club Member 1394 - near London
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November 22, 2012
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Well, Got the rings out in one piece, cleaned every thing up and made sure that the rings would move freely by the scratch. The rings were not too badly marked. I just swapped the top and bottom ring, so that the scratches no longer lined up.

 

I also dragged a thin strip of rag round the bottom of the crank… but nothing else came out… so hope that is good news.

 

All back together and works a treat.

 

 

Happy days laugh

 

Nigel.

April 2, 2013
11:29 pm
neddyo
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I really like your D1 comp Nigel, how about some more

photo’s.

Nick.thumbs-up

April 3, 2013
9:42 am
nigelD3
Club Member 1394 - near London
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November 22, 2012
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Thanks Nick, the Frame was a 150cc D3… the rest of the bike is of unknown parentage. Now that we are starting to get a bit of sun, I’ll take a few photos and start a blog.

April 3, 2013
10:53 pm
neddyo
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Is that the donor bike in your avatar?

April 4, 2013
2:51 pm
nigelD3
Club Member 1394 - near London
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November 22, 2012
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Yes, The avatar pic is of the bits loosely stood together. The blue bits are the D3, the other bits were bought separately

April 4, 2013
7:58 pm
Hawaii50
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November 5, 2012
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NigelD3 wrote: “All back together and works a treat.”

I love a happy ending!

Nice little video – I could smell the gorgeous two stroke smoke mmmmm!

love-it

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