I think i was a little too optimistic in my last post. It seems I can’t get rid of a loud knocking noise even after many careful valve adjustments and i now think i have a bottom end problem. Take a listen to the video
https://youtu.be/ybMeoOGqM74
None of the other xt’s i own even come close to making this much noise which doesn’t bode well for me. When i disassembled the top end for the rocker arm replacement i checked the cylinder bore for wear and it looked good enough. No disastrous scoring. I did not however check for up down play in the rod and i think i may be in for trouble. Bike has 150psi cold compression and starts easily, but this noise is not normal.
XT won’t shift into second
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scottieh
- Financial
- Posts: 796
- Joined: Wed Mar 30, 2011 3:58 am
- What Bike or Bikes Do You Own?: 1988 XT600Z 3AJ
1987 XT600Z 1VJ
1985 XT 600
1980 TT500
1980 XT250
2001 KTM 300XC - Previously Owned Bikes: 1982 XT550
1981 TT250
1989 Yamaha Virago 750
1994 DR650
1980 Suzuki GR650
1997 KLR 250
1986 Honda Spree - Location: Salt Lake City
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Mezo
- Dashingly Handsome
- Posts: 6108
- Joined: Wed Mar 23, 2011 11:01 am
- What Bike or Bikes Do You Own?: Kymco agility 125 ;-)
- Previously Owned Bikes: Honda SS50, Suzuki TS50, Honda CB100, Honda CR125RZ, Yamaha YZ125, Kawasaki KX250, Suzuki TL1000S, Ducati 900SS, Ducati 900SL, a few Tenere`s.
- Location: Queensland Australia
- Contact:
Re: XT won’t shift into second
Is it just me? ignore the knocking & listen at around 0:32 sounds like a dry bearing. 
Mezo.
Mezo.
"A wise man makes his own decisions, an ignorant man follows public opinion"
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scottieh
- Financial
- Posts: 796
- Joined: Wed Mar 30, 2011 3:58 am
- What Bike or Bikes Do You Own?: 1988 XT600Z 3AJ
1987 XT600Z 1VJ
1985 XT 600
1980 TT500
1980 XT250
2001 KTM 300XC - Previously Owned Bikes: 1982 XT550
1981 TT250
1989 Yamaha Virago 750
1994 DR650
1980 Suzuki GR650
1997 KLR 250
1986 Honda Spree - Location: Salt Lake City
Re: XT won’t shift into second
The dry whine at 0:32? A bottom end split? Don’t tempt me with a good time...Mezo wrote: Thu Aug 13, 2020 11:29 pm Is it just me? ignore the knocking & listen at around 0:32 sounds like a dry bearing.
Mezo.
I think, i think, i think the issue is rocker shaft slop in the head. The 500’s had a known history of drying up at the exhaust rocker and in the process it reams out the rocker shaft seats in the head. The 250 probably does the same thing. In fact a diy fix for the 500 is to drill and tap a hole above the rocker shafts and insert a grub screw pushing down against the shaft to keep it from rattling around. Unfortunately the 250 head ergonomics doesn't allow for a straight down drill and tap so I’m going to try swapping heads with a spare i have. Beyond that I’ll have to go ebay or junkyard hunting. Will be checking for rod play while I’m back inside the engine.