250-500cc WR250 2009 Top end Rebuild

Any tips?

whats the compression supposed to be before and after?

i'll post updates

This is a good reference
http://www.thumpertalk.com/forum/archive/index.php/t-714983.html

Tips like:-
"I cleaned the bore with a scotch brite and WD-40, trying to mimic the stock cross hatching. If you have a lot of glaze you might want to use a hone"

i did it

[YOUTUBE]08G2MUGOkI8[/YOUTUBE]

anthony how many hours before you rebuilt the top end. also did you take a compresion test before and after and what was it?

great vid.

hi
i brought the bike 2nd hand and the original owner claimed 1000kms
since then ive done 1500kms (march 2010) so approx 2500km's

the compression was 190-195 psi before the rebuild. i took it out on the weekend to run it in, so i should check it again now. the bike goes like a rocket now.

here's the new topend in my HUSKY 250 2009 vs KTM 300 2010

[YOUTUBE]_A_QrnwOeTg[/YOUTUBE]


[YOUTUBE]BbcAXrxpqco[/YOUTUBE]

good job mate, will be interested to see comp results with new piston.

i was told they should get 2500-3000klms.

The piston looked ok but the skirts were worn @2500kms
i wouldn't want to leave it much longer

the powervalve bearings were seized and full of carbon making it
very notchy

i haven't done the comp test yet, i caught a flu after the weekend snow ride

[YOUTUBE]Ke0v4GH90jc&feature=player_embedded[/YOUTUBE]

[YOUTUBE]bpHOoN8AV6k[/YOUTUBE]

Snow, sheet I am not ready to think about snow.

Walt

mate I could have beaten you on my 125 the dude on the ktm wasnt trying hard enough

whatever

I just did a comp test. The bike has done 5hrs since the rebuild last week, and started heaps easier +ran well

The husky punched out 210psi now compared to 195psi (before the rebuild)

Both times i had warmed the engine/ held the comp tester over engine/ dry piston and wet piston/ 10 kicks /throttle wide open/ check psi.

Anthony I still don't get why you would want to buy a Gasser when you own the mighty Red & White? I took a new gasser for a ride this week(300) & its got nothing on my Wr300. The husky has more power every were compared to the Gasser. The Gasser is not as aggressive though, then again my 300 seems to have more power than my old 360 even after a rebuild.The 300 dosn't tractor as much as the old 360, But when I change the gearing it probably will. Don't do it, stick with the red & white