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Thumpin' Special......On The Road Again! (Read 18417 times)

Dave

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Re: Thumpin' Special......On The Road Again!
Reply #450 - 08/18/25 at 07:38:10

I went for a 40 mile ride yesterday.

The bike is running great and is a joy to ride.....the 94mm Wiseco Flat top piston really is working well.

After 40 miles I did have a few oil spots in the usual place. I looked the cylinder over and could not see the source....the front of the head gasket appear dry as does the cylinder stud nut under the exhaust port.

I am going to clean this oil off and put some miles on it, and the source of the leak will likely show up once it has a chance to accumulate some dust on the engine.

On the next rainy day that I can't get yard work done, I will likely remove the head cover and removed, clean and torque all the cylinder studs.

IMG_5108.JPG

Someday I will be old......But not today!

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Dave YaBB Moderator ModSquad Offline SuzukiSavage.com Rocks! Posts: 18613 Camp Springs, Kentucky Gender:	Re: Thumpin' Special......On The Road Again! Reply #451 - Today at 16:37:38 Well the bike came apart today to fix the oil leak. The cam and rockers look excellent! This is a Webcam Stage 3 from Lancer.
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Dave YaBB Moderator ModSquad Offline SuzukiSavage.com Rocks! Posts: 18613 Camp Springs, Kentucky Gender:	Re: Thumpin' Special......On The Road Again! Reply #452 - Today at 16:39:00 When the head cam off - you can see the oil on the stock Suzuki multi-ply head gasket. When I pulled the head gasket off and dried it off - the crimped bead was flattened everywhere, and the plies had a thin coating of oil all through them.
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Dave YaBB Moderator ModSquad Offline SuzukiSavage.com Rocks! Posts: 18613 Camp Springs, Kentucky Gender:	Re: Thumpin' Special......On The Road Again! Reply #453 - Today at 16:43:32 The top of the piston with 500 miles of break in oil and a somewhat easy riding with limited full throttle use (no extended speed runs). However I did ride at 60-70 mph a few times. There is a light carbon accumulation in the center - the edges have the Cerakote thermal barrier showing.
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Dave YaBB Moderator ModSquad Offline SuzukiSavage.com Rocks! Posts: 18613 Camp Springs, Kentucky Gender:	Re: Thumpin' Special......On The Road Again! Reply #454 - Today at 16:44:29 The cylinder still has the cross hatch.
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Dave YaBB Moderator ModSquad Offline SuzukiSavage.com Rocks! Posts: 18613 Camp Springs, Kentucky Gender:	Re: Thumpin' Special......On The Road Again! Reply #455 - Today at 16:45:36 The piston skirts look pretty good overall. There is also no carbon along the sides of the piston at the rings.
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Dave YaBB Moderator ModSquad Offline SuzukiSavage.com Rocks! Posts: 18613 Camp Springs, Kentucky Gender:	Re: Thumpin' Special......On The Road Again! Reply #456 - Today at 16:47:05 The bottom of the piston is squeaky clean!
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Dave

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Re: Thumpin' Special......On The Road Again!
Reply #457 - Today at 16:50:41

I removed the rings from the piston and cleaned up the cylinder and piston.

I checked the clearance using a feeler gauge - a 0.005" feeler gauge was a pretty tight fit. The Wiseco specified minimum clearance is 0.0025" for this piston.

The cylinder was a pretty good looking one - the best stock 94mm cylinder that I had. However - it may be the wear is a bit excessive and is allowing the piston to mover around a bit.

There is wear on the bottom edge of the piston skirt.

IMG_5639.JPG

Someday I will be old......But not today!

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Dave YaBB Moderator ModSquad Offline SuzukiSavage.com Rocks! Posts: 18613 Camp Springs, Kentucky Gender:	Re: Thumpin' Special......On The Road Again! Reply #458 - Today at 16:51:38 This is the other side.
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Dave

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Re: Thumpin' Special......On The Road Again!
Reply #459 - Today at 17:01:52

I am going to take the piston and cylinder and get the clearance measured by my friends at a machine shop.

I am then going to send the piston to Line2Line coatings to get an abradable piston skirt coating applied. This coating will reduce the clearance and allow the piston to wear into the cylinder with tighter clearances than is possible with the aluminum.

https://www.youtube.com/watch?v=TLK402TKozk

Someday I will be old......But not today!

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