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Rebore before big end?
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Blue Heeler
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February 15, 2020 - 8:39 pm
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Quality work. Checked out PJ`s website re their reboring kit and procedures... she should run in beautifully. Their details are going in my contacts book, thanks.

Love your ring-clamp trick!

Blue

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nickjaxe
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February 16, 2020 - 12:10 am
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Good job well done Justin...I had my crack done around 2 years ago...goes great now...like you new piston and re-bore.

My ring clamp is a plastic drain pipe wall clamp/bracket...pefect even has tabs for your fingers to do the clamping.

Nick.

My Bantam video              https://www.you.....jpOFmzRZRI

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bantammad
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February 16, 2020 - 9:16 am
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Hi bantammad ere just shows how interesting what people use to do functions, plastic drain pipe clamp l like that one, just stored that into the annals of my brain thanks regards Les 

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nickjaxe
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February 16, 2020 - 10:55 am
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This is the type.Clamp-1.jpgclamp2.jpg

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My Bantam video              https://www.you.....jpOFmzRZRI

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bantammad
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February 16, 2020 - 11:10 am
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Hi bantammad ere what a cracking idea I will be using that one just shows after doing mechanics for sixty years etc still learning regards Les 

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swalsh58
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February 16, 2020 - 2:10 pm
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That is just brilliant.

Current bikes......1958 D5, a 77 Suzuki GT250 and a B175 almost ready for the road and a 76 Honda C90 in the workshop. A 1980 Honda CB400N now on the road and my everyday ride is a 2011 Harley Davidson Sportster. All bikes (except the D5) are now for sale...

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Blue Heeler
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February 16, 2020 - 3:15 pm
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Nice one Nick. Dirt cheap too. Win-win

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nickjaxe
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February 16, 2020 - 3:18 pm
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Some of those clamps have bars or ridges mounded on the inner face...they seem best...gives a good pressing force on the ring...

The gap lets you keep your eye on the ring gaps...to make sure they're in the right place.

I do have proper ring clamps but I prefer using that one.

My Bantam video              https://www.you.....jpOFmzRZRI

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Blue Heeler
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February 16, 2020 - 4:01 pm
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nickjaxe said
Some of those clamps have bars or ridges mounded on the inner face...they seem best...gives a good pressing force on the ring...
The gap lets you keep your eye on the ring gaps...to make sure they're in the right place.
I do have proper ring clamps but I prefer using that one.  

If this does the trick for me, looks like I`ll be using it for smaller pistons and only getting my trade clamps out of the cupboard for the bigger jobs.

I would file the inside of the plastic clamp smooth of any centre ridges. Having rebuilt dozens of engines over the years, I can`t see how a stepped clamp can work with any efficiency, in fact it sounds like a disaster waiting to happen...ie broken rings. Brilliant idea otherwise.

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NeilB
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February 16, 2020 - 5:24 pm
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I just use my finger nails to hold the rings in place for small engines, and then I've got a proper piston ring compressor for when you can slide the piston in front the top of the cylinder that's wrapped up spring steel with a ratchet on it.

Drain pipe clamp and cable ties both look great ideas though 🙂 

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bantammad
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February 17, 2020 - 12:48 pm
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Hi bantammad ere just found a plastic clamp some think like you have tried with a piston and barrel on the bench works well,must get one those next time I’m in town thanks again for that Les 

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nickjaxe
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February 17, 2020 - 2:22 pm
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Blue Heeler said

If this does the trick for me, looks like I`ll be using it for smaller pistons and only getting my trade clamps out of the cupboard for the bigger jobs.

I would file the inside of the plastic clamp smooth of any centre ridges. Having rebuilt dozens of engines over the years, I can`t see how a stepped clamp can work with any efficiency, in fact it sounds like a disaster waiting to happen...ie broken rings. Brilliant idea otherwise.  

The moulded bars are in the up/down direction...so the ring will slide past with no grabbing...its not a ridge...I prob described it badly...you would need to see it...they don't all have them depends who makes em.

If I think on I will take a close up pic of mine.

My Bantam video              https://www.you.....jpOFmzRZRI

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Blue Heeler
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February 17, 2020 - 2:38 pm
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Ok Nick, fair enough. I`ll dig me one out later and take a butchers at it. Got a shed guttering/down-pipe job on the go. Blue

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nickjaxe
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February 17, 2020 - 6:00 pm
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DSCN8418-1.JPGDSCN8419-1.JPGA better pic.

Some are just plain which should be just as good....You can keep your eyes on the pins in the gap.

Nick.

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b175er
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February 17, 2020 - 6:38 pm
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JustinW said

All put back together and the compression is instantly noticeable as improved.

Fired up and sounding different too, super smooth.

Haven't been for a spin yet due to utter filthy state of lanes, but super excited to try her out.
 

Just been reading these posts. Hopefully you'll have done quite a few miles since September. Does the Bantam run to your satisfaction now it's done and are you pleased with it ?
  

two B175s and a CB360

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JustinW
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February 17, 2020 - 7:40 pm
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Just been reading these posts. Hopefully you'll have done quite a few miles since September. Does the Bantam run to your satisfaction now it's done and are you pleased with it ?
    

Actually what happened was I put the bike back together last year with all things sorted except for the engine internals which I considered a daunting task. The bike didn't really perform as I would have hoped. So I recently bit the bullet and totally striped the engine. New crankshaft seals and bearings, rebore and loose big end /small end sorted. Found a few other niggles internally which I sorted. Quite a steep learning curve!

So, in terms of performance improvement I have no idea as too wet (!!!!) to take out right now. I am very hopeful though, as a host of issues have been sorted.

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cocorico
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February 23, 2020 - 7:30 am
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nickjaxe said
...My ring clamp is a plastic drain pipe wall clamp/bracket...pefect even has tabs for your fingers to do the clamping.

Nick.  

Great tip there Nick. Thanks for sharing it.

1956 D3 running, lights to sort. 7 other bikes in the Barn. 1950 D1 engine being rebuilt (slowly).

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Bee175
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February 23, 2020 - 2:03 pm
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Liking the down pipe bracket and tie wrap ideas for holding the rings in.

I've had 100% success so far just using my fingernails, but both these methods sound a lot less risky, so I will be adopting one of them next time I'm doing a rebuild.

Thanks guys👍

BSA Bantam B175 1971 and BSA C15 1966

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b175er
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February 28, 2020 - 7:04 pm
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JustinW said


Just been reading these posts. Hopefully you'll have done quite a few miles since September. Does the Bantam run to your satisfaction now it's done and are you pleased with it ?
    

Actually what happened was I put the bike back together last year with all things sorted except for the engine internals which I considered a daunting task. The bike didn't really perform as I would have hoped. So I recently bit the bullet and totally striped the engine. New crankshaft seals and bearings, rebore and loose big end /small end sorted. Found a few other niggles internally which I sorted. Quite a steep learning curve!

So, in terms of performance improvement I have no idea as too wet (!!!!) to take out right now. I am very hopeful though, as a host of issues have been sorted.  

A steep learning curve indeed. But what a sense of achievement you'll feel when it goes really well. Roll on the dry weather !

two B175s and a CB360

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JustinW
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March 14, 2020 - 7:14 pm
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Well... After all the work done on the engine it ran like a pig on its test run. No better than with worn rings, shot crank seals and everything else. 

After a couple of weeks sulking and head scratching I decided to replace the ignition coil (a green one under fifteen quid from ebay).

Job done, it's pulling now and running like a top. Phew. I guess the spark under compression was not sufficient to light the mixture every stroke.

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