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Piston and bore need replace - Motorcycles

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  • Gregg Mahin
    Gregg Mahin Jul 06, 2019

    Hi, Ron I would really love to help you with your bike question but due to the magnitude of yesterday's solar flare the batteries in my crystal ball are dead and my mental telepathy headset circuitry was melted. I need the year, make, and model of your motorcycle please click on " Ask For More Information" directly below and provide this information in the box that will open and then click on the green "SEND" box in the bottom right-hand corner after it posts I will receive an "ALERT" icon that will allow me to respond to your information. Good luck and have a wonderful day.

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Posted on Jan 02, 2017

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SOURCE: 87 yz 125t. bored .30'' over need 56.75mm Piston

yea, for most bikes they only come in .020 increments now. if your looking to freshen up the top end, then youll have to go to a 56.00mm piston. there will be almost no change in displacement or jetting from 55 to 56mm. if your replacing the piston, its best to have your cylinder bored anyways. since the worn cylinder walls may have adverse effects on the new piston rings, and they may wear a bit prematurely. a bore only costs about 30-40 bucks most places, and its cheap insurance. plus you will have the peace of mind knowing that your bore is matched specifically for your piston. I would definitely recommend a fresh bore.

Posted on Aug 03, 2009

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SOURCE: Need Piston bore sizes of Robin Eng. ; EX17

67mm x 48mm

(2.64x1.89) inches

Posted on Apr 15, 2010

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sachin0161
  • 171 Answers

SOURCE: If the brake caliper piston

try to get it overhauled..because might be it has gone jammed due to dust clottings......else get it replaced due to severe risks of brakes jams

Posted on May 06, 2011

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2 Answers

I need piston rings for 1991 7.3 IDI. What do they mean bore size Std., .020, .030, .040?


.20 .30 and .40 are oversizes. you have to measure the cleaned up bore to order the right ring set. if you are going to replace the rings you should get the cylinders bored and honed

Jun 25, 2018 | Motorcycles

1 Answer

I got a 1983 xr80. What are the piston/cylinder clearance specs.. stock? And how much can I hone/bore out?


most piston /ring kits come in .010" , .020",.030",.040" oversize
most engine re-conditioners use cnc borers set to an over size and bore to that
after honing to get the correct cross hatch pattern in the bore , that is it
the ring gap is what is important and it should be around .003" per ever 1" of bore
so for a 3" bore the gap should be around .010"
experience has proved that if the cylinder is bored to say .020" oversize then when the gap for .020" oversize rings is checked ,it generally comes in around .015 and even as large as .020"
max specs for ring gaps is .025" which is for a worn cylinder
just honing a bore is a waste of effort as bores wear in a taper ( larger at the top than the bottom and this taper increases the wear of the new rings and can lead to broken rings
the ridge at the top of the bore has to be removed to allow the piston to come out easily and to prevent piston failure when the new rings are fitted
have a talk with engine reconditioning shops and then make an informed decision
remember that if the cylinder can be separated from the crankcase , you can buy standard or oversize piston/ring/cylinder sets as assemblies so there is no need to bore out or hone.

Sep 03, 2015 | Motorcycles

3 Answers

2003pontiac grand prix how compress the piston by compressing or by turn in ?


What you need to do is lift the car take out the wheel where crank shaft is,
also know as the harmonic balancer

Jan 20, 2013 | 2003 Pontiac Grand Prix

1 Answer

How do i no if i need my pisyon cylinder re-board or just cleaned as there is some light scratching in it ,and if i do need to grt it re-board what size will i re-boar it too. thanks for your help


The bore has to be measured at a number of places to see if it is out of round 0.01mm or tapered 0.05mm
You will need to take it to an engineering shop that can do the boring, they can measure the piston and bore to determine what oversize it will need.
with only light scratches probably 1 oversize 0.25mm, if it has been bored before the oversize is stamped on the top of the piston. 0.25, 0.50, 0.75
A rough measurement can be done with a feeler gauge, between the piston skirt and bore.
piston clearance for a 125 is about 0.055-0.060mm with a limit of 0.1mm

Jul 28, 2011 | 2003 KTM SX 125

1 Answer

Dear Sir, can a gl1000 be re,bored & fitted with


Yes it can be bored, .050 over is fairly common on this bike. Before boring the cylinders, the new pistons should always be matched to the old ones. You always find problems with aftermarket parts. Have the cylinders bored to match the new pistons. Don't bore the cylinders and expect the new pistons to be a perfect match. I hope this helps.

Jul 03, 2011 | 1976 Honda GL 1000 (K1)

1 Answer

I own a black pulsar 220 dts-i and it has run over 11000 kilometers.last month my gear was malfunctioning so i took it to the service station and then they opened the whole engine for it.after it got...


Blue smoke is usually a cracked piston ring or worn out oil ring.
The only time the valves should be suspect is if the valves were recently lapped or replaced.
It's possible in those cases that the valve seals might leak oil into the cylinder.
Most often though, you will be looking at the piston rings, and the cylinder itself might need to be honed or bored.
If the cylinders need to be bored because of gouging due to scraping of the cracked or shattered rings, then you will need an oversize piston and rings to fit the new bore.

Jun 27, 2011 | 2010 Bajaj Pulsar 220 DTSi

1 Answer

How do you reset caliper piston on the rear of a Pontiac G6 2006 car?


YOU NEED LARGE C - CLAMP TO COMPRESS PISTON IN CALIPER BORE.REMOVE SMALL AMOUNT BRAKE FLUID FROM BRAKE MASTER CYLINDER RESERVOIR FIRST BEFORE YOU COMPRESS PISTON. AFTER REMOVING A LITTLE BRAKE FLUID.AND COMPRESSING CALIPER PISTON IN BORE.PLACE MASTER CYLINDER RESERVOIR COVER BACK ON.WHEN FINISHING REPLACING BRAKES.PUMP BRAKE PEDAL UNTIL BRAKES FEEL SOLID AND FIRM CHECK BRAKE FLUID LEVEL.DONT DRIVE VECHICLE IF BRAKES DONT FEEL FIRM OR SOLID.

Oct 10, 2010 | 2006 Pontiac G6

1 Answer

87 yz 125t. bored .30'' over need 56.75mm Piston


yea, for most bikes they only come in .020 increments now. if your looking to freshen up the top end, then youll have to go to a 56.00mm piston. there will be almost no change in displacement or jetting from 55 to 56mm. if your replacing the piston, its best to have your cylinder bored anyways. since the worn cylinder walls may have adverse effects on the new piston rings, and they may wear a bit prematurely. a bore only costs about 30-40 bucks most places, and its cheap insurance. plus you will have the peace of mind knowing that your bore is matched specifically for your piston. I would definitely recommend a fresh bore.

Jul 29, 2009 | Yamaha YZ 125 Motorcycles

1 Answer

Piston rings


First, be sure they actually do fit the bore. Take a ring and insert it in the bore. push the ring halfway into the bore using the piston. There should be about a 1/32" gap in the ring. Anything more than 1/16" and you need rings the next size up. If the ring won't go into the cylinder because the gap fully closes, the rings need to be a smaller size.

With the correct size rings, put them on the piston. Some pistons have an index pin in the ring groove Fit the gap to the pin. Put the piston mid-stroke and place the cylinder over the top of the piston. Squeeze the rings closed as you gently tap the cylinder downward and over the rings.

Please rate this solution. Thanks garethholleb!

Apr 04, 2009 | Gilera Runner VX 125 Motorcycles

1 Answer

How do i replace the front caliper seal on 06 malibu maxx??????


while the seals in the calipers are replaceable, its probably easier just to get a new/re manufactured caliper. if for any reason the seals don't work perfectly you could lose control of the vehicle when attempting to stop. with that said i'll try to explain the best i can how to replace the seals in the calipers for that vehicle.

1. jack up the front of the vehicle, place on jackstands and remove the front wheels, make sure the parking brake is on
2. unbolt the caliper and unbolt the brake line from the caliper and take caliper to a clean bench
3. remove the dust boot retaining ring on the caliper that holds the boot to the caliper itself
4. using a blowgun with a rubber tip apply low pressure compressed air where the brake line was bolted to the caliper to push the piston out of the bore (be carefull and ready because the piston may shoot out with some force)
5. when the piston comes out you will need to replace the dust boot and the seal so remove the boot and seal carefully so you don't scratch the piston ( the seal is actually in the caliper piston bore hole)and throw out the old seal and boot.
6. inspect all the surfaces and make sure there are no imperfections at all on the piston, the piston bore, or the caliper, if the surfaces are marred in anyway, replace the caliper, if they are good, using brake cleen and compressed air clean all parts then dry them
7. get the new seal and lubricate with DOT 3 brake fluid
8. install new seal into the caliper bore
9. apply a thin coat of DOT 3 brake fluid to the piston itself
10. install bottom half the the caliper piston into the caliper bore.
11. install new dust boot seal onto the piston
12. compress the piston to the bottom of the caliper bore
13. fully seat the dust boot seal into the caliper and install retaining ring
14. reinstall on vehicle (make sure to use a NEW copper washer on the brake line to caliper fitting) and bleed the braking system while checking for leaks.

repeat process for the other side.

if the caliper leaks at all from the piston after seal replacement, replace the caliper.

make sure you properly bleed the brakes before attempting to drive your car.

*these direction were extracted from personal experience and manufacturer information*

any other questions just ask!


Feb 20, 2009 | 2006 Chevrolet Malibu Maxx

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