Sherco 320 4t
Posted 20 December 2007 - 01:23 AM
1. If I'd stopped it, (using kill button as advised), or stalled it and it was pointing downhill to any degree it just would not fire up at all. Turn it round and point it up hill and it would fire up second or third kick. Now I can see the answer to this would be obvious but..........................
2. A section I tried on a number of occasions calls for a shortish blast up a bank, tight turn between trees and a short drop back down on full lock. Bike stalled a number of times when going down the bank and refused to start having done so.
Now I realise some of this may be down to my riding technique and not being used to the four stroke differences but it doesn't seem to like being pointed downhill! Any clues as to what might be causing this? Has anyone had any such experiences and how did you resolve the problem? I did wonder about float height or whether float was possibly sticking but uphill ain't a problem and other than this the bike ran perfectly all the time. Any clues or suggestions would be greatfully received. Other than this 'minor' problem I think the bike is awesome!
Though it's a 2005 model it has been greatly update and includes 2008 cylinder head, cam, de-compressor, pwk28 carb and 2008 ignition system. No hot start device fitted though I do have it available.
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Posted 20 December 2007 - 04:20 AM
I put a small drain in mine made out of an old tube valve stem, so if it gets flooded with fuel or water you can take the valve cap off and drain.
If fuel is the problem you may need to adjust your float hight.
Posted 20 December 2007 - 09:47 PM
Posted 28 December 2007 - 05:49 PM
I've just mastered the starting also. When new it was a pig but now nearly run in it's a lot better.
I've also lowered float height. Not sure how you should measure height on PWK but it's definateley lower than i ran on the 290.
Posted 28 December 2007 - 11:14 PM
were you born in 2006 perhaps
Posted 29 December 2007 - 04:40 AM
wahey now we can all lol at you because they did
were you born in 2006 perhaps
Gasser guys on the Sherco thread again!
Posted 24 January 2008 - 02:44 PM
Here's a list of what has been done
Cam mods with new de-compressor mechanism
Re-inforced 2008 inlet manifold
Keihin PWK28 carb with :-
45 pilot jet
120 main jet
GFH needle on centre notch (part number to follow next time I have the carb off.....)
3.5 cutaway slide
Hot start mechanism fitted (although I never need to use it) - one point here - make sure that the vent hose from the inlet manifold doesn't get kinked when you put the fuel tank back on as this'll stop the hot start system working)
Float height set to 16.7 mm (it was 15.2 mm before and I had stalling problems before I changed this) - measured from the gasket face to the corner of float where the vertical edge meets the bottom – this will be obvious when you take the float bowl off
Re-routed fuel pipe away from exhaust with heat shield between
The bike starts easily (hot or cold) within 3 or four kicks and quite often starts first kick (much to everyone’s surprise and I get comments like “I thought these things wouldn’t start”) – I use the method shown on the Sherco USA web page (they have a video ) but basically the technique is ease it past compression and give it a gentle prod, not like a 2 stroke where you need great lunges at them
It also runs down to tickover and will pull away cleanly (assuming that you don’t give it full throttle from a standstill, it is a big 4 stroke single with a carb after all) up steep slopes from almost no MPH and I’m a hefty 19 stone, so with your average 11 stone trials "wizard" it’ll take off vertically
The tickover is set fairly low, I’m not sure what RPM it will be running at, but it doesn’t sound as if it’s racing like others I’ve seen and heard
It does need a bit more ‘fettling’ than other trials bikes I’ve owned, but this only following the recommended servicing procedures and making sure the carb, airbox and air filter are kept spotless
Also make sure that you don’t get water into the airbox, especially if you’re power washing the bike – the left hand vent in the ‘seat’ is ideally placed to allow water to be fired into the air intake (the right hand one isn’t too clever either) so cover them with duct tape or be very careful with the power washer or garden hose
Posted 22 February 2008 - 09:54 PM
Posted 23 February 2008 - 04:21 AM
i have the same problem with my 06 sherco 125cc. 2t. i can ride it around fine but as soon as the down hill appears it fluffs and dies unless i keep the engine revving manualy instead of on tickover
As this is really a different animal(presume you are running the dellorto) sounds as though you need to clean the carby and verify the float height as well.
I recommend you start a new thread on this if you continue to have problems.
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