89 CR250 seized questions

sabreguy · Post by **sabreguy** » July 2nd, 2011, 10:08 am

Yesterday Matt's 250 seized on him in 5th pretty much wide open. My question is it the do you guys think the cylinder needs to be replated? Here are some pics

The cylinder feels as smooth as silk but we did find some metal pieces laying between the crank and front of case . We tried to get them out but they dropped down into the case so we are going to split the cases and install all new gaskets and seals and bearings if needed. Just want to know what you guys think of the cylinder. Thanks

100hp honda · Post by **100hp honda** » July 2nd, 2011, 12:35 pm

looks like brits good engine. 3 cups dirt, 1oz oil and a pinch of rust

Tharrell · Post by **Tharrell** » July 2nd, 2011, 1:15 pm

Geez, it's gonna be fun flushing that engine.
Probably WILL be better to open it up to clean it out.
Plating? Don't know, it's hard to get a feel from a pic.
What happened? Worn rings, bad jetting, overheat?
This came out of a 2001 CR250 and the cylinder was just fine.
It WAS brand new but the PO put it in backwards!

Post by **AlisoBob** » July 2nd, 2011, 2:02 pm

100hp honda wrote:looks like brits good engine. 3 cups dirt, 1oz oil and a pinch of rust

Pinch? Looks like the coolant came from the Titanic.

britincali · Post by **britincali** » July 2nd, 2011, 2:31 pm

My engines look fukin surgical compared to that mess

pstoffers · Post by **pstoffers** » July 2nd, 2011, 2:40 pm

That is a lot of BRASS!!!

sabreguy · Post by **sabreguy** » July 2nd, 2011, 4:35 pm

It was from an overheat the bonehead didn't check the coolant before we left. This is the first time this bike has been opened up since we have had it it ran tits so we never had a reason to break it open until now.

Tharrell · Post by **Tharrell** » July 2nd, 2011, 4:56 pm

Clean it up, measure it. and inspect it thoroughly.
Nikasil is a lot harder than you think.
Unless the rings got into it, it might be ok.
But seriously, where did all that stuff in the bottom end come from?
There's grit everywhere including in the rings.

pstoffers · Post by **pstoffers** » July 2nd, 2011, 5:48 pm

It is the lower rod thrush washers... that thing needs a full rebuild..

Post by **AlisoBob** » July 2nd, 2011, 8:05 pm

I'd sent it to GSS

sabreguy · Post by **sabreguy** » July 4th, 2011, 10:36 am

pstoffers wrote:It is the lower rod thrush washers... that thing needs a full rebuild..

DING DING DING and the lower bearing is toast.
Who does crank rebuilds?

Tharrell · Post by **Tharrell** » July 4th, 2011, 3:03 pm

AlisoBob wrote:I'd sent it to GSS

Now THAT"S real hoon love.

pstoffers · Post by **pstoffers** » July 5th, 2011, 6:21 pm

sabreguy wrote: Who does crank rebuilds?

If you send it to me I can get it done. Call me 209-480-7900

BannedCR500Riders.com

89 CR250 seized questions

89 CR250 seized questions