Bored And Honed

[Amstaff]

how do you know if you need a bore? and is it always necesary to get a hone when you rebuild the top end?can you just buy a topend kit and put the pistons and rings in or will i need to take the cyilanders some place to have them preped?

ie. bored or honed? and how would one know what size pistons they should get?

 

 

thanx!!!

[ruff_rida69]

you don't need to bore unless you have scratch's on you cylinder or if it has alotta wear on it, and you don't have to have a hone but it's a good ideal if you want a good ring seal, and take your cylinders to a dealer and get them to check the bore and they can tell you what size pistons you need and if you need to bore it over.

[spoin39]

Always hone the cylinder when putting new rings or pistons in!

[2Smoker]

how do you know if you need a bore?

 

Usually by doing a compression test it will tell you what your cylinders are running at. Anything below 100 pounds of compression I would pull the cylinder off and inspect it further. Maybe all you need is rings to fix the problem.

 

and is it always necesary to get a hone when you rebuild the top end?

 

YES!!! I got away with buying an engine glaze breaker and honing my cylinders everytime a piston blew up, and putting the same sized piston and rings in. This roughs up the cylinder and cleans it up without making the cylinders any bigger and allows the rings to seat properly. You have to do this or your rings won't seat. And you can do it yourself.

 

can you just buy a topend kit and put the pistons and rings in or will i need to take the cyilanders some place to have them preped?

 

If your cylinders are OK, just buy a glaze breaker (40 bucks or something) hone it out and clean the cylinders with soapy water and coat them in oil and youre all set to put the cylinders back on. You can buy a topend kit, i reccomend wiseco, it comes with a head gasket, 2 base gaskets and 2 pistons, 2 sets of rings, 2 wrist pins, and 2 sets of circlips, and o-rings for your pipes. That's all you need.

 

and how would one know what size pistons they should get?

 

If you don't know what size pistons to get then you don't know what your cylinders are bored out to. You will need a micrometer to see what your bore size is, any shop will have one and they can tell you what the bore size is. Stock bore is 64 MM and wiseco pistons come in a .20 thousandths of an inch increment (which is 0.5MM) so your first bore over would 64.5MM.

 

Have a look here for a chart on bore size and CC displacement its sort of useful.

 

Hope this answers your question.