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Author Topic: 93 CR500 Cases  (Read 5515 times)

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Offline utsman

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93 CR500 Cases
« on: March 20, 2008, 09:13:33 pm »
I have pulled the motor from the beast for a rebuild.After taking the cylinder off I have found some small cracks in both case halves just around the little holes below where the transfer ports would be(main bearing lube holes??) How drastic is this? Anyone seen it before?

UTSMAN
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Offline holeshot buddy

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Re: 93 CR500 Cases
« Reply #1 on: March 20, 2008, 11:02:53 pm »
just check and make sure they are not casting marks
very unusual to crack there ;D
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Offline Hoony

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Re: 93 CR500 Cases
« Reply #2 on: March 21, 2008, 07:36:51 am »
holeshot is right about his Honda knowledge for once, sometimes casting marks do look like cracks
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Long time Honda Fan, but all bike nut in general, Big Bore 2 stroke fan.    http://www.youtube.com/watch?v=XJoKP6MawYI
1985 Honda CR500RF "Big Red"
1986 Honda CR250RG
2005 KTM 300EXC "The GruntMeister" ( I love that engine)

Offline utsman

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Re: 93 CR500 Cases
« Reply #3 on: March 23, 2008, 10:44:56 am »
Well I am pretty sure they are cracks as my fingernail catches on them. Might have to get an opinion from a bike shop. Hope I am not up for new cases >:(
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Offline Hoony

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Re: 93 CR500 Cases
« Reply #4 on: March 23, 2008, 10:56:14 am »
post up some detailed photo's if you want. i have a CR500 pressure plate spare that looks like it is cracked but it is casting marks too. i will post it later to compare if you want
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Long time Honda Fan, but all bike nut in general, Big Bore 2 stroke fan.    http://www.youtube.com/watch?v=XJoKP6MawYI
1985 Honda CR500RF "Big Red"
1986 Honda CR250RG
2005 KTM 300EXC "The GruntMeister" ( I love that engine)

Offline utsman

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Re: 93 CR500 Cases
« Reply #5 on: March 25, 2008, 06:44:24 pm »
Having trouble with pics. I will try 1 at a time
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Offline utsman

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Re: 93 CR500 Cases
« Reply #6 on: March 25, 2008, 06:45:17 pm »
Here another
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Offline utsman

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Re: 93 CR500 Cases
« Reply #7 on: March 25, 2008, 06:46:38 pm »
Why me >:(

What you think guys. Please tell me about the casting marks again

STU
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Offline Hoony

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Re: 93 CR500 Cases
« Reply #8 on: March 25, 2008, 07:08:50 pm »
utsman what part of the crankcase is that? can you do a shot from a bit back to show the whole case?
is it in a stressed area?
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Long time Honda Fan, but all bike nut in general, Big Bore 2 stroke fan.    http://www.youtube.com/watch?v=XJoKP6MawYI
1985 Honda CR500RF "Big Red"
1986 Honda CR250RG
2005 KTM 300EXC "The GruntMeister" ( I love that engine)

Offline utsman

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Re: 93 CR500 Cases
« Reply #9 on: March 25, 2008, 07:31:53 pm »
Hey Hooney,

These are the holes that sit just below the transfer ports. I presume they are to lube the main bearinggs. You can see the crank half in the right of the first picture. I would'nt think they are particularly stressed. I will go for another photo.
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Offline utsman

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Re: 93 CR500 Cases
« Reply #10 on: March 25, 2008, 07:42:56 pm »
Here Ya Go Hoony

See the holes on each side of the engine. This is bad aint it?

STU
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Offline Hoony

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Re: 93 CR500 Cases
« Reply #11 on: March 25, 2008, 09:07:41 pm »
Stu, i reckon you will be right as they look like casting marks to me.

i will bow to others if they think different. i assume you have not split the cases to look further.
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Long time Honda Fan, but all bike nut in general, Big Bore 2 stroke fan.    http://www.youtube.com/watch?v=XJoKP6MawYI
1985 Honda CR500RF "Big Red"
1986 Honda CR250RG
2005 KTM 300EXC "The GruntMeister" ( I love that engine)

Offline utsman

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Re: 93 CR500 Cases
« Reply #12 on: March 25, 2008, 09:36:11 pm »
Not yet. Let you know how I go.

Thanks Hoony
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Offline holeshot buddy

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Re: 93 CR500 Cases
« Reply #13 on: March 25, 2008, 10:42:31 pm »
casting marks ;D
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Offline utsman

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Re: 93 CR500 Cases
« Reply #14 on: March 26, 2008, 06:09:17 am »
I'll take your word for it guys.

Cheers :D
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