Have to start with a TPS check, they cause jerkiness when they're on their way out.Also make sure your spark plug caps are screwed on to the HT leads properly.If air filter's been changed and the TPS is showing up okay and in the correct position then my next step would be a carb balance.
I had this problem, had the wrong plugs in, 9E when they should have been 8E. Ran like a dream for the last 2k so might be worth a look which plugs you have fitted
Dirty pilot jets before switching to main jets ???
I'm having the same trouble! Done all the usual checks I'm of the opinion the the tps is on the way out. I'm pretty sure it got some water leaked into it over a heavy weekend here recently.My next step is to take it off and give it the hair dryer treatment followed by a spray of isopropyl alcohol. If this don't work then I think I'm looking for a replacement sensor- ouch! The last thing I want to do is much about with the carbs i'm not to confident with them tbh.
The horrible thing about the TPS is that they don't tend to just peg out and stop working, they play silly buggers for a while until you just know something ain't right.The obvious thing for starters is making sure the needle's sitting on the 5K position on the rev counter.If it's not, then adjust it until it is but then keep doing quick checks on it every day if the bike doesn't quite feel like it should do.If it keeps moving position, or stays on 10K or 0K, then it's on its way out.You won't tend to notice it too much over 3000rpm, although it still won't be right, but under 3000rpm it will feel very jerky and you will need to use the clutch lever much more than normal to keep some kind of proper control over it.It's possible you may suffer starting problems too, and also the tick over may not appear to be very stable either.Unfortunately a dodgy TPS can also resemble a badly unbalanced set of carbs as well so keeping an eye on what the RPM needle is doing is important.If that is showing as being stable on the 5K mark then it could be that the carbs just need syncing. If this is the case then you need to make sure your air filter isn't in a bad way either as any stuffed up airways can give false readings on balancing.If you do think you may need another TPS unit, don't bother with a used/second hand one. These bikes are at least 14 years old now so, as i learned twice already, if you buy an electrical part that's 14+ years old with unknown mileage on it then it's just waiting to die as well so just buy a new replacement part and be done with it.These will work on all models.http://www.ebay.co.uk/itm/Yamaha-FZS-600-H-Fazer-2002-Tourmax-Throttle-Position-Sensor-/331848912138?hash=item4d43bc8d0a:g:~wYAAOSwQNRXK4wG
Quote from: darrsi on 17 August 2017, 07:14:27 amThe horrible thing about the TPS is that they don't tend to just peg out and stop working, they play silly buggers for a while until you just know something ain't right.The obvious thing for starters is making sure the needle's sitting on the 5K position on the rev counter.If it's not, then adjust it until it is but then keep doing quick checks on it every day if the bike doesn't quite feel like it should do.If it keeps moving position, or stays on 10K or 0K, then it's on its way out.You won't tend to notice it too much over 3000rpm, although it still won't be right, but under 3000rpm it will feel very jerky and you will need to use the clutch lever much more than normal to keep some kind of proper control over it.It's possible you may suffer starting problems too, and also the tick over may not appear to be very stable either.Unfortunately a dodgy TPS can also resemble a badly unbalanced set of carbs as well so keeping an eye on what the RPM needle is doing is important.If that is showing as being stable on the 5K mark then it could be that the carbs just need syncing. If this is the case then you need to make sure your air filter isn't in a bad way either as any stuffed up airways can give false readings on balancing.If you do think you may need another TPS unit, don't bother with a used/second hand one. These bikes are at least 14 years old now so, as i learned twice already, if you buy an electrical part that's 14+ years old with unknown mileage on it then it's just waiting to die as well so just buy a new replacement part and be done with it.These will work on all models.http://www.ebay.co.uk/itm/Yamaha-FZS-600-H-Fazer-2002-Tourmax-Throttle-Position-Sensor-/331848912138?hash=item4d43bc8d0a:g:~wYAAOSwQNRXK4wGHi darrsi, thanks for this. You're spot on about the tick over not being stable, it's not excessive yet but it does fluctuate a bit too much for my liking. Unfortunately I'm going to have to live with it until the weekend when I can get a chance to look at it properly. I'm in the middle of laying 90 x 60 x 5cm slabs in the back garden and I've got about 6 tonne of stuff to move about so god knows when I'll get it done. Again spot on with the ebay link fella- it's a reasonable price, I was expecting a lot worse. If I do need to buy( I'm almost certain) I'll defo get a new unit.
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although I think FZS600 doesn't have it, only 1000
I finally go the Fazer back from the workshop. The problem was with the carboratour and valves. There was too much fuel getting into it and that was a reason why it was losing power. Proper cleaning, including some liquid added to the fuel, solved the problem. Now it runs like brand like Thanks again for all advices.