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+--- Thread: engine diagnosis (/showthread.php?tid=69658)
engine diagnosis - simonm - 18-07-14
Hiya all. A friend of mine is having a problem with his fazer and I was wondering if anyone could diagnose the issue from the evidence I have ?
Cheers
Issue: above 6,000 rpm loss of power engine sounds like it is misfiring/rough
Tried
: coils swapped with known good
: TPS swapped with known good
: plugs swapped with known good
: ignition unit swapped with known good
: breather tubes checked
: reg/rec swapped with known good
: all electrical cables checked for corrosion
Apparently the carbs have been balanced recently although I understood that normally affected low revs..
To all intents and purposes the electrical system seems fine. The brakes, lights, cooling system, clutch and gears work too.
Any ideas please ?
Re: engine diagnosis - Dead Eye - 18-07-14
Have you checked the air inlet and filter as well as the fuel filter?
Re: engine diagnosis - BBROWN1664 - 18-07-14
TPS swapped, but was it set up?
Does it have a restrictor kit fitted?
Re: engine diagnosis - positron - 18-07-14
I recently when thru something similar, and it turned out to be a clogged up air filter. Here's the thread with some solid sensible advice from Unfazed and others here.
http://foc-u.co.uk/index.php/topic,13563.0.html
Re: engine diagnosis - simonm - 18-07-14
Tps went to 10,000rpm and rotated back until it went to 5000 rpm and tightened.
Re: engine diagnosis - simonm - 18-07-14
Air inlet unblocked and air filter clean. I'm assured the fuel filter is clean/new but that's a wildcard atm..
Re: engine diagnosis - simonm - 18-07-14
No restrictor kit AFAIK. The bloke doesn't think there is a restrictor fitted .
Re: engine diagnosis - chaz - 18-07-14
a mate bought a cagiva the one with the tl 1000 engine, it was only just run in when he got it, it wouldn't rev over a certain range, he was a mechanic and had checked all electrics etc, we thought it might be a broken valve spring?
It turned out to be a MISSING valve spring which had never been in. You just never know.