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About bluegnu

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  • Bike
    Sherco 2.5 '04

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  • Location
    Hampshire, UK
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  1. Is it likely to be damaging on a 250cc engine do you think? It doesn't appear to be an insert, more like the whole neck is narrow. Here's what the two exhausts look like side by side - my old 2.5 exhaust (left) and the narrow on the right:
  2. Polished up!

    From the album Sherco 2.5 2004

    Cleaned up the swing-arm too. Some spokes could do with replacing
  3. Cylinder head off

    From the album Sherco 2.5 2004

    I used aluminium wire mesh to cover the airfilter and prevent muck getting in.
  4. Replaced clutch cover

    From the album Sherco 2.5 2004

  5. I finally lifted the cylinder head and it wasn't as bad as I'd feared (pictures below) The piston and head were completely caked in carbon, so obviously hadn't been open for a very long time, but once cleaned off didn't look bad at all. It's probably the original piston! It looks like it's taking in too much fuel judging by the residue in the cylinder and on the spark plug?
  6. I had similar problems on my very old Sherco sometimes taking ten+ kicks starting, sometimes not and the throttle being tetchy, backfiring, overheating etc. Was worried the stator had gone, but eventually pulled the flywheel after advice here (tenner for the flywheel puller), the woodruff key had completely sheared - a couple of quid from Splatshop. It's and easy job if you have the tools
  7. Can anyone tell me why the exhaust header pipe I just got on a well-known auction site has a narrow neck where it joins the cylinder? First I thought it was from a smaller CC, but looking at other ones online I've seen them advertised from the 290cc. My bike goes well with it on but will it overheat?
  8. Thanks for the encouragement and guidance. I've not had time or courage to tackle taking it apart yet... For the most part she's running well and the slow action throttle makes a hell of a difference. What is strange is starting from cold with choke is often first quick, but restarting when hot can be a bugger and take many kicks with throttle open! I also found the intermittent fan was down to a loose connection between the thermostat (now bypassed) Maybe tackle the cylinder this weekend, cautious about causing more harm than good.
  9. Slow action throttle

    From the album Sherco 2.5 2004

    Such an easy job to swap over to the slow action throttle and has instantly made the bike much more manageable and controllable. With the standard throttle I felt like I was hanging on for dear life and it was beyond touchy, felt like you had to turn it with your finger tips. Now I can lift the front wheel comfortably and have a lot more control.
  10. Magnetic lanyard kill-switch

    From the album Sherco 2.5 2004

    Another 2 minute job.
  11. I'm still unsure about some engine tapping/rattle. Starting it is a lot better since replacing the stator, also a lot less unpredictable on the throttle I think (unless I'm just getting used to it) I'd like to get the cylinder off to see what condition the piston is in - but if I get in there, wondering if I should replace piston rings as a matter of course. Or, if the piston is looking badly worn, am I better off just saving for the piston kit? I imagine if there's not too much play in the piston I might get away with a top end bearing and rings. How frequently do these things need doing, on a bike of this age, depending how hard it's been ridden? In the meantime, going to swap for a Slow Action throttle because it is far too sensitive...
  12. Short gear lever

    From the album Sherco 2.5 2004

    I swapped the original lever with a shorter one because I was having trouble reaching it. Also can now take the flywheel cover off without removing the lever first.
  13. IMG-1842v2.jpg

    From the album Sherco 2.5 2004

  14. Does the engine sound noisy - a bit of rattle?