collapse

www.dimecitycycles.com

https://www.townmoto.com/collections/vanson-leathers


www.restocycle.com

www.CITYLIMITMOTO.com

www.jadusmotorcycleparts.com

www.bisonmotorsports.com

www.speedmotoco.com

www.lostapostlejewelry.com

www.cognitomoto.com

www.sparckmoto.com

www.pistonsociety.com

www.steeltowngarage.com


Author Topic: What size do I need my cylinders bored to?  (Read 105 times)

Offline Classic5

  • Posts: 11
What size do I need my cylinders bored to?
« on: Oct 02, 2018, 11:01:13 »
Hi All,

I have a Honda Cl200 with low compression (110 Left and 120 Right) and after messing with it for a month I finally decided to bite the bullet and pull the engine apart. Well as I was afraid of, there was a considerable amount of vertical scoring in the cylinder walls and on the pistons themselves. So...I've decided to try and find a shop to bore out my cylinders.

I found a few kits that have over-sized pistons and rings that say they are .5mm over-sized or 56mm instead of the factory 55.5mm. Which brings me to my question. What specs should I be requesting from the shop doing the boring? Should I ask for 56mm or does it need to be something different?

This is my first complete rebuild, so any advice would be greatly appreciated!!

Thanks

Online Hurco550

  • DTT SUPPORTER
  • *
  • DTT BOTM WINNER
  • *
  • Posts: 3593
  • Keep er' Between the ditches
Re: What size do I need my cylinders bored to?
« Reply #1 on: Oct 02, 2018, 11:33:01 »
Hi All,

I have a Honda Cl200 with low compression (110 Left and 120 Right) and after messing with it for a month I finally decided to bite the bullet and pull the engine apart. Well as I was afraid of, there was a considerable amount of vertical scoring in the cylinder walls and on the pistons themselves. So...I've decided to try and find a shop to bore out my cylinders.

I found a few kits that have over-sized pistons and rings that say they are .5mm over-sized or 56mm instead of the factory 55.5mm. Which brings me to my question. What specs should I be requesting from the shop doing the boring? Should I ask for 56mm or does it need to be something different?

This is my first complete rebuild, so any advice would be greatly appreciated!!

Thanks

Take the pistons with you to the shop. Any shop worth their salt will match the bore to the size of the piston with proper clearances. If the shop says that they don't need your pistons, find another shop.


If you are willing to ship, I HIGHLY recommend mototech USA in Mansfield ohio. The guy who runs it (chris) is outstanding AND experienced. He also still only charges $35 a hole, which is cheap these days, especially for what I consider grade A work. His number is 419 512 3588. Leave a message if he doesn't answer. He is old school like that lol

Good luck.
« Last Edit: Oct 02, 2018, 19:02:14 by Hurco550 »
"If you just picked up a drug habbit instead of a kawasaki triple at least you could get high while you waste money"
~ bradj
1988 tw200, the swamp donkey: http://www.dotheton.com/forum/index.php?topic=75455.0
2006 Suzuki DR650 Adventure monowheel trailer build: http://www.dotheton.com/forum/index.php?topic=75033.0
1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
"much ingenuity with a little money is more profitable and amusing than much money without ingenuity" - Arnold Bennet

Offline irk miller

  • DTT SUPPORTER
  • *
  • DTT BOTM WINNER
  • *
  • Posts: 8000
  • You've been mostly-dead all day.
Re: What size do I need my cylinders bored to?
« Reply #2 on: Oct 02, 2018, 11:36:45 »
+1

All of my machine work gets shipped to Mototech.