Question about 1976 Honda CB 100

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What is the piston to bore clearance for a 1965 honda ca200 m/c

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A fresh bore job should have a piston to wall clearance of .002"if its .005"then its boarder line,anything after that then bore to next size.

Posted on Mar 16, 2011

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Ring end gaps for B&S 31P777 engine


If the engine the figures are required for is a re-ring using the original pistons it is important to check the amount of wear of the bore and of the piston groove clearance.

Once the ring gap is set to the minimum at an unworn part of the cylinder bore the gap should be rechecked at the most worn part and if the gap exceeds the maximum it indicates an excessively worn cylinder bore.
While this is not immediately detrimental it does mean the piston ring grooves will wear much more quickly and the job will have a shorter life and in some cases a high oil consumption can be worsened.

The piston ring groove clearance - side clearance between the ring and the piston should be 0.0015 inch maximum. It can be expected the top groove could be considerably worn and in that case new pistons would be beneficial or a Cord ring set.

Sep 11, 2017 | Cars & Trucks

1 Answer

Need Piston to cylinder wall clearance and piston ring end gap installed and free for a Spear and Jackson SPJBC 28 Strimmers, Thanks.


piston to cylinder clearance is .001"-.0015" and the ring gap is .003" for every 1" of bore
all measurements are taken at the bottom of the cylinder

Jun 04, 2017 | Motorcycles

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What is the piston to bore clearance on a 1984 Harley soft tail with wiseco pistons?


Usually the minimum clearance is listed on the outside of the Wiseco box. You can always call them, they are very good about helping folks.
I will say don't use the stock Harley clearance as a guide, the Wiesco's are forged so need greater clearance and would seize at the stock clearance, Frank

Jan 29, 2015 | Harley Davidson Motorcycles

1 Answer

What is the 289 windsor piston to bore clearance


the clearance is .0015" with a feeler strip between the piston skirt and the cylinder. The ring gap will be around .010" measured at the bottom of the bore. Industry standard is .003" per 1" of bore

Aug 02, 2014 | 2005 Ford Shelby GR-1

1 Answer

Valve adjustment shims for Mazda protege 2002 2.0 litter engine. Dual over head cams 16 valve. Was bored out .020 inches over? What size if it was over bored out?


Three sizes of pistons are available:
1. Std.
2. Over size 0.010 in (0.25 mm).
3. Over size 0.020 in (0.50 mm).
Over sized pistons and rings are widely used in all automobiles with no trouble at all. They last for more than 200,000 km, provided if the engine oil, oil filter and air filters are replaced at the recommended intervals.
The most important point to consider here is to maintain the oil clearances between the various parts during the machining process.
For example piston to cylinder clearance, crankshaft to main journals and big ends clearance, valve to guide clearance, at room temperature. Then comes cleaning process and the engine assembling process.

Dec 28, 2013 | 2002 Mazda Protege

1 Answer

How to install a big bor kit on a 50 cc scotter


It's a pretty big job. You need to be competent (and confident) with tools as well as diagnosing and repairing gas engines. Without knowing the details of your scooter, the overview is this: 1) Remove the carburetor (if mounted to the cylinder), exhaust pipe, cylinder head, cylinder and piston. 2) Have the cylinder bored out** to provide the correct clearance between the cylinder and the piston (if different from the scooter manufacturer's clearance this information should be provided by kit manufacturer). 3) Modify the head (more machine work to reshape the combustion chamber to work with the larger bore). 3) Reassemble. 4) Modify the fuel system (usually a carburetor) to correctly fuel the now larger displacement engine. 5) Get the new set up running and then tune it to run properly without damaging itself from an incorrect fuel mixture.


** Some cylinders are aluminum with a steel sleeve that forms the bore that piston runs in. Some are aluminum with a thin nikasil coating on the aluminum bore. These will be much more expensive to bore out as they will need to have the coating replaced after being bored out.

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I have a Honda GC160 5hp that I just rebuilt but will not start


did you check the piston to bore clearances? did you check the ring end gaps? did you hone the cylinder and check it for roundness?

Jul 08, 2017 | Psi 2500 Mobile Pressure Washer 5hp Honda...

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What is the clearance for rod bearings on the crank of a 98 ford f 150 4.6


General Specifications Item Specification
Displacement L (CID) 4.6 (281)
Number of Cylinders 8
Bore and Stroke mm 90.2 x 90.0
Firing Order 1-3-7-2-6-5-4-8
Oil Pressure (HOT @ 1500 rpm) kPa 138-310
Drive Belt Tension a
Cylinder Head and Valve Train
Combustion Chamber Volume cm 52?±.5
Valve Seats Width?€"Intake mm 1.9-2.1
Valve Seats Width?€"Exhaust mm 1.9-2.1
Valve Seats Angle 44.51-45.01 degrees
Valve Seats Runout (T.I.R.) Max mm 0.025
Valve Arrangement (Front-to-Rear) (Left Hand) E-I-E-I-E-I-E-I
(Right Hand)
I-E-I-E-I-E-I-E
Valve Stem to Guide Clearance?€"Intake mm (Inch) 0.020-0.069
(0.00078-0.00272)
Valve Stem to Guide Clearance?€"Exhaust mm (Inch) 0.045-0.095 (0.0018-0.0037)
Valve Head Diameter?€"Intake mm (Inch) 44.5- (1.75)
Valve Head Diameter?€"Exhaust mm (Inch) 34.0 (1.34)
Valve Head Diameter?€"Gauge Diameters mm (Inch) 42.5- and 32.0
(1.67 and 1.26)
Valve Face Runout Limit mm (Inch) 0.05 (0.002)
Valve Face Angle 45.25-45.75 degrees
Valve Stem Diameter (STD)
?€"Intake mm (Inch) 6.995-6.975 (0.275-0.2746)
Valve Stem Diameter (Std)
?€"Exhaust mm (Inch) 6.970-6.949 (0.274-0.2736)
Valve Springs?€"
Compression Pressure N @
Spec. Length?€"Intake 587.14 N @ 28.02 mm
Valve Springs?€"
Compression Pressure N @
Spec. Length?€"Exhaust 587.14 N @
28.02 mm
Valve Springs?€"Free
Length ( Approximate)?€"
Intake mm (Inch) 49.55 (1.951)
Valve Springs?€"Free
Length (Approximate)?€"
Exhaust mm (Inch) 49.55 (1.951)
Valve Springs?€"Installed
Pressure N @ Spec. Length
?€"Intake 244.64 N @ 40.0 mm
Valve Spring?€"Installed
Pressure N @ Spec. Length
?€"Exhaust 244.64 N @ 40.0 mm
Valve Springs?€"Installed
Pressure N @ Spec. Length
?€"Service Limit 10 % Pressure Less @ 28.02 mm
Valve Springs?€"Installed
Pressure N @ Spec. Length
?€"Out of Square Limit 2 degrees
Valve Guide Inner
Diameter mm (Inch) 7.015-7.044 (0.2761-0.2773)
Rocker Arm?€"Ratio 1.75:1
Valve Tappet?€"Diameter
(STD) mm (Inch) 16.000-15.988 (0.66-0.629)
Valve Tappet?€"Clearance
to Bore mm (Inch) 0.018-0.069
(0.00071-0.00272)
Valve Tappet?€"Service
Limit mm (Inch) 0.016 (0.00063)
Valve Tappet?€"Hydraulic
Leakdown Rate b 5-25 seconds
Valve Tappet?€"Collapsed
Valve Tappet Gap?€"
Desired mm (Inch) 0.085-0.45 (0.0033-0.0177)
Camshaft
Lobe Lift?€"Intake
mm (Inch) 6.58939 (0.2594)
Lobe Lift?€"Exhaust
mm (Inch) 6.58939 (0.2594)
Lobe Lift?€"Allowable
Lobe Lift Loss mm (Inch) 0 (0)
Theoretical Valve Lift @
Zero Lash?€"Intake
mm (Inch) 12.0 (0.472)
Theoretical Valve Lift @
Zero Lash?€"Exhaust
mm (Inch) 12.0 (0.472)
End Play mm (Inch) 0.025-0.165
(0.00098-0.0065)
Journal to Bearing
Clearance mm (Inch) 0.025-0.076
(0.00098-0.003
Journal to Bearing
Clearance?€"Service Limit
mm (Inch) 0.021 (0.0048)
Journal Diameter (All)
mm (Inch) 26.962-26.936
(1.061-1.060)
Journal Diameter (All)?€"
Bearing Inside Diameter
(All) mm (Inch) 27.012-26.987
(1.063-1.0625)
Camshaft Runout
mm (Inch) 0.05 (0.002)
Cylinder Bore
Diameter?€"Surface Finish
(RMS) 0.2-0.6 Microns
Diameter?€"Out-of-Round
Limit mm (Inch) 0.015 (0.0006)
Diameter?€"Out-of-Round
Service Limit mm (Inch) 0.020 (0.00079)
Diameter?€"Taper Service
Limit mm (Inch) 0.006 (0.00023)
Piston
Piston?€"Diameter?€"
Coded Red 1 mm (Inch) 90.177-90.197
(3.550-3.551)
Piston?€"Diameter?€"
Coded Blue 2 mm (Inch) 90.190-90.210
(3.5507-3.5515)
Piston?€"Diameter?€"
Coded Yellow 3 mm (Inch) 90.203-90.223
(3.513-3.5521)
Piston-to-Bore-Clearance
mm (Inch) -0.015 + 0.031 (0.0005-0.0012)
Pin Bore Diameter
mm (Inch) 22.0015-22.004
(0.866-0.8663)
Ring Groove Width?€"
Compression (Top)
mm (Inch) 1.520-1.550 (0.06-0.610)
Ring Groove Width?€"
Compression (Bottom)
mm (Inch) 1.520-1.530 (0.060-0.0602)
Ring Groove Width?€"Oil
Ring mm (Inch) 6.996-7.224 (0.275-0.2844)
Piston Pin?€"Length
mm (Inch) 61.93-62.05 (2.44-2.443)
Diameter mm (Inch) 21.994-21.999
(0.866-0.8661)
Pin to Piston Clearance
mm (Inch) 0.005-0.010
(0.0002-0.0004)
Pin to Rod Clearance
mm (Inch) 0.015-0.040
(0.0006-0.00157)
Piston Rings?€"Ring Gap
?€"Compression (Top)
mm (Inch) 1.0 MAX (0.0394)
Piston Rings?€"Ring Gap
?€"Compression (Top)
mm (Inch) 1.0 MAX (0.0394)
Oil Ring?€"Side Clearance
mm (Inch) 1.25 MAX (0.05)
Oil Ring?€"Compression
(Top) mm (Inch) 0.040-0.090
(0.0016-0.0031)
Oil Ring?€"Compression
(Top) mm (Inch) 0.030-0.080
(0.0012-0.00031)
Oil Ring Snug Fit
Oil Ring?€"Service Limit
mm (Inch) 0.015 MAX (0.0006)
Ring Gap?€"Compression
(Top) mm (Inch) 0.23-0.49
(0.01-0.02)
Ring Gap?€"Compression
(Bottom) mm (Inch) 0.23-0.49
(0.01-0.02)
Ring Gap?€"Oil Ring (Steel
Rail) mm (Inch) 0.05-0.66 (0.006-0.026)
Lubrication System
Oil Capacity?€"Automatic
Transmission (Quarts U.S.) 6.675?±0.125
Oil Capacity?€"Manual
Transmission (Quarts U.S.) 6.425?±0.125
Cylinder Block
Main Bearing Bore
Diameter mm (Inch) 72.401-72.422 (2.85-2.851)
Crankshaft and Flywheel
Main Bearing Journal
Diameter mm (Inch) 67.483-67-503 (2.65-2.657)
Connecting Rod Journal?€"
Diameter mm (Inch) 52.988-53.003
(2.0861-2.0867)
Crankshaft Free End Play
mm (Inch) 0.130-0.301 (0.0051-0.012)
Crankshaft Runout to Rear
Face of Block mm (Inch) 0.050 MAX (0.002)
Connecting Rod Bearings
Clearance to Crankshaft?€"
Desired mm (Inch) 0.027-0.069 (0.001-0.0027)
Clearance to Crankshaft?€"
Allowable mm (Inch) 0.027-0/069 (0.001-0.0027)
Bearing Wall Thickness
(STD) mm (Inch) 2.44-2.452 (0.096-0.0965)
Main Bearings
Clearance to Crankshaft?€"
Desired mm (Inch) 0027-0.065
(0.0011-0.0026)
Clearance to Crankshaft?€"
Allowable mm (Inch) 0.027-0.065
(0.0011-0.0026)
Bearing Wall Thickness
(STD) mm (Inch) 1.920-1.928 (0.075-0.076)
Connecting Rod, Piston and Rings
Connecting Rod?€"Piston
Pin Bore Diameter
mm (Inch) 21.959-21.979
(0.864-0.865)
Connecting Rod?€"
Crankshaft Bearing Bore
Diameter mm (Inch) 56.756-56.876 (2.234-2.24)
Connecting Rod?€"Length
(Center-to-Center)
mm (Inch) 150.7 (5.93)
Alignment (Bore-to-Bore
Max. Diff.) c ?€"Twist
mm (Inch) 0.050 per 25 (0.0015-0.984)
Alignment (Bore-to-Bore
Max. Diff.)?€"Bend
mm (Inch) 0.038 per 25 (0.0015-0.984)
Side Clearance (Assembled
to Crank)?€"Standard
mm (Inch) 0.015-0.45 (0.0006-0.0177)
Side Clearance (Assembled
to Crank)?€"Service Limit
mm (Inch) 0.05 MAX (0.02)
Crankshaft Main Bearing
Journal Taper mm (Inch) 0.020 (0.0007)
Crankshaft Main Bearing
Journal Runout mm (Inch) 0.05 (0.002)
Crankshaft Connecting Rod
Journal Taper mm (Inch) 0.015 (0.0006)

Feb 15, 2011 | 1998 Ford F150 Regular Cab

1 Answer

What is the piston ring gap clearance for the ford laser


Which Piston Ring Gap? First of all you need to purchase a Hayne's Manual for your car. It will give you the specifications under the Engine section of the book. The piston has three rings on it. From the top you have your first compression ring, then your second compression ring (these "clearance" specifications or "gap"), should be the same as measured on the piston insofar as the clearance between the "lands and grooves" or between the ring and the piston groove. The third ring is your oil control ring which will have a different clearance between (for example), the top of the ring installed and the piston's groove. Then lastly, you need to place the compression rings and place them in the bore of the cylinder WITHOUT being installed on the piston. A measurement is then taken between the opening gap of the ring while in the block. To make sure it's lined up properly, invert a non-ringed piston down into the bore from the top to make sure the ring is installed at the same depth all the way around.

If you don't want to buy the Hayne's Manual, just stop by your local Dealership and get the Specifications for the two compression rings, the oil ring and the "installed" clearance or gap on the rings.

Hope this Helps,

~00 Buck~

"Still living on the Right Side of Dirt..."

May 18, 2010 | Ford Laser Cars & Trucks

1 Answer

Bore size


The cylinder bore is just that > the bore size of the cylinder. The piston clearance should be 0.0015 to 0.003. Anything more than .005 and the piston is too loose.

Apr 17, 2009 | 2003 kawasaki KX 250

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