OzVMX Forum

Marque Remarks => Honda => Topic started by: utsman on March 20, 2008, 09:13:33 pm

Title: 93 CR500 Cases
Post by: utsman 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

Title: Re: 93 CR500 Cases
Post by: holeshot buddy on March 20, 2008, 11:02:53 pm

just check and make sure they are not casting marks
very unusual to crack there ;D

Title: Re: 93 CR500 Cases
Post by: Hoony on March 21, 2008, 07:36:51 am

holeshot is right about his Honda knowledge for once, sometimes casting marks do look like cracks

Title: Re: 93 CR500 Cases
Post by: utsman 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 >:(

Title: Re: 93 CR500 Cases
Post by: Hoony 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

Title: Re: 93 CR500 Cases
Post by: utsman on March 25, 2008, 06:44:24 pm

Having trouble with pics. I will try 1 at a time

Title: Re: 93 CR500 Cases
Post by: utsman on March 25, 2008, 06:45:17 pm

Here another

Title: Re: 93 CR500 Cases
Post by: utsman on March 25, 2008, 06:46:38 pm

Why me >:(

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

STU

Title: Re: 93 CR500 Cases
Post by: Hoony 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?

Title: Re: 93 CR500 Cases
Post by: utsman 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.

Title: Re: 93 CR500 Cases
Post by: utsman 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

Title: Re: 93 CR500 Cases
Post by: Hoony 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.

Title: Re: 93 CR500 Cases
Post by: utsman on March 25, 2008, 09:36:11 pm

Not yet. Let you know how I go.

Thanks Hoony

Title: Re: 93 CR500 Cases
Post by: holeshot buddy on March 25, 2008, 10:42:31 pm

casting marks ;D

Title: Re: 93 CR500 Cases
Post by: utsman on March 26, 2008, 06:09:17 am

I'll take your word for it guys.

Cheers :D

Title: Re: 93 CR500 Cases
Post by: Hoony on March 26, 2008, 02:05:01 pm

Utsman i will post up a pic tonight if i get time of a similar casting mark on a CR500 Clutch Prssure plate.

Title: Re: 93 CR500 Cases
Post by: All Things 414 on March 27, 2008, 04:39:11 pm

God these japs must be in a hurry to knock off of a night! Casting marks all over the place!! :o

Title: Re: 93 CR500 Cases
Post by: Hoony on March 28, 2008, 05:35:57 pm

Utsman, here is a few pics of casting marks on a pressure plate. they look like cranks/fractures but only appear on one side. underside of the plate has some as well and again only on one side and not all the way through.

Title: Re: 93 CR500 Cases
Post by: Hoony on March 28, 2008, 05:52:51 pm

and another 2

Title: Re: 93 CR500 Cases
Post by: holeshot buddy on March 28, 2008, 11:45:54 pm

they dont have enough power to crack pressure plates so you are safe ;D

Title: Re: 93 CR500 Cases
Post by: Hoony on March 29, 2008, 08:18:29 am

i left myself open on that one hey Holesnot Buddy  :D

Title: Re: 93 CR500 Cases
Post by: utsman on April 03, 2008, 06:41:24 pm

Just got home from a work stint. No internet for 11 days :(

Thanks Hoony. Your photos put my mind at ease. Rusty is gonna rip into it next week and the bore is at Serco right now. Pick it up tomorrow with a vertex kit, then drop it all to Yandina. Should be riding in 3-4 weeks with a brand new engine. Yee ha .Then all is left is to save for some new plastics. I hate the pinky reddy orange of the 93 era. Anyone know if I can get plastics in the old school red (eighties) for my bike?

Cheers guys.

Title: Re: 93 CR500 Cases
Post by: holeshot buddy on April 03, 2008, 09:35:47 pm

yes the plastics are available from les at vintage plastics he
has show plastics (gloss) or race (not gloss) ??? in that colour very high quality
i wish the yamaha plastics were as good ;D