Author Topic: Piston ring compressor  (Read 1237 times)

Offline 7iain7

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Piston ring compressor
« on: 30.12. 2023 18:04 »
Can anyone recommend a pair of piston ring compressors for the A10.
I only have a car type ring compressor.

Many thanks, Iain
52 A10

Offline muskrat

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Re: Piston ring compressor
« Reply #1 on: 30.12. 2023 18:39 »
G'day Iain.
Make your own.
I use 90mm poly pipe and hose clamps. Cut a 1,1/2" piece off the pipe then cut it, wrap it around piston & mark to get the right length (1/4" gap is best). Once the rings are set in position and oiled wrap the pipe around and compress with the hose clamp till tight then back off till the pipe can just be rotated. Push the barrels down till well over the rings, undo the hose clamp completely and remove the clamp & pipe over the barrel skirt so not to damage the piston. I also cut a nylon cutting board to fit under the piston skirt to hold them still. Job done.
Cheers
'51 A7 plunger, '57 A7SS racer now a A10CR, '78 XT500, '83 CB1100F, 88 HD FXST, 2000 CBR929RR ex Honda Australia Superbike .
Australia
Muskys Plunger A7

Offline trevinoz

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Re: Piston ring compressor
« Reply #2 on: 30.12. 2023 21:07 »
If you can find them, the Terry ring compressors work well. Just make sure that you get the right diameter set.

Offline limeyrob

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Re: Piston ring compressor
« Reply #3 on: 31.12. 2023 11:18 »
I got a pair of Terry clones off e-bay last week.  Look OK but thicker metal so not to up to the original quality but will do the job.
Slough 59 GF/SR

Offline RichardL

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Re: Piston ring compressor
« Reply #4 on: 31.12. 2023 14:03 »
G'day Iain.
 I also cut a nylon cutting board to fit under the piston skirt to hold them still. Job done.
Cheers

Iain,
Don’t be confused by Musky’s custom long hold-down bolts for the barrels on his racing engine.

Richard L.

Offline muskrat

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Re: Piston ring compressor
« Reply #5 on: 31.12. 2023 18:37 »
G'day Iain.
 I also cut a nylon cutting board to fit under the piston skirt to hold them still. Job done.
Cheers

Iain,
Don’t be confused by Musky’s custom long hold-down bolts for the barrels on his racing engine.

Richard L.
G'day Iain/Richard.
Not wanting to get off topic  *whistle*
The 4 long studs makes it easier to lower the barrels square to the pistons. The A7 plunger has the modified (through bolted) top end off the old 57 A7SS racer when I converted the racer to the A10 Cafe.
Cheers
'51 A7 plunger, '57 A7SS racer now a A10CR, '78 XT500, '83 CB1100F, 88 HD FXST, 2000 CBR929RR ex Honda Australia Superbike .
Australia
Muskys Plunger A7

Offline RichardL

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Re: Piston ring compressor
« Reply #6 on: 31.12. 2023 20:17 »
I guess I was the one confused, though, it’s not exactly obvious on first look that those are just alignment studs. How many through- bolts are used with the modified head? Oh,  BTW, how ‘bout them ring compressors? *smile* ;)

Offline muskrat

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Re: Piston ring compressor
« Reply #7 on: 31.12. 2023 21:37 »
G'day Richard.
The 4 studs do make taking the ring compressors off a little more difficult.
The 4 studs were introduced when the racer had a problem lifting the top end off the cases. Thin flange barrels and 14:1 compression don't mix *eek* The 4 outside head bolt holes in both the head and barrels are moved out 1/2 a hole.
Cheers
'51 A7 plunger, '57 A7SS racer now a A10CR, '78 XT500, '83 CB1100F, 88 HD FXST, 2000 CBR929RR ex Honda Australia Superbike .
Australia
Muskys Plunger A7

Offline 7iain7

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Re: Piston ring compressor
« Reply #8 on: 31.12. 2023 23:01 »
Thanks for all the replies.
And happy new year all
52 A10