I’ve recently bought another FZS1000 and been trying to get it to run right. It stutters at low revs (up to 3k) and backfires on overrun. It pulls well above 3k but doesn’t feel as powerful as my previous but that maybe because it had an Ivan’s “slip on” kit, which I haven’t yet installed on this one. It’s done 46k
I’m looking for ideas on what may be the problem as I’m running out of ideas myself.
- Stripped and cleaned carbs
- Cleaned jets, checked sizes. Needle size & position
- Checked diaphragms for punctures
- Balanced Carbs
- Set valve clearances
- TPS failed so new TPS, set to 5k (tried 10k bounce)
- Checked & cleaned electrical connectors
- New filters (air, fuel & oil)
- Check resistances etc on Coils, TPS, sender, plug caps
- Swapped out plug caps to make an equal set
- Cut recommended ½” from ignition leads
- Changed plugs (CR9E & CR9EIX)
- Stripped Exup & straightened to ensure it opened & closed smoothly, rebuilt & adjusted
Seems to runs best with mixture screws 2½ turns out
Plugs are whiteish
I haven’t checked the compression yet but don’t see any indication that is the problem.
My next thought is a worn cam chain, anyone any experiences with this or know where I can find timing for valve opening & closing?
If I replace it, I am assuming I will have to use a “split” chain (at £80) rather than the original endless (at £24), unless anyone can advise a way to do it without splitting the crankcase.