Date: 30-04-24  Time: 21:31 pm
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Author Topic: engine diagnosis  (Read 1578 times)

simonm

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engine diagnosis
« on: 18 July 2014, 03:47:37 pm »
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 ?
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Dead Eye

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Re: engine diagnosis
« Reply #1 on: 18 July 2014, 04:03:44 pm »
Have you checked the air inlet and filter as well as the fuel filter?
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BBROWN1664

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Re: engine diagnosis
« Reply #2 on: 18 July 2014, 04:53:20 pm »
TPS swapped, but was it set up?

Does it have a restrictor kit fitted?
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positron

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Re: engine diagnosis
« Reply #3 on: 18 July 2014, 05:07:19 pm »
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
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simonm

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Re: engine diagnosis
« Reply #4 on: 18 July 2014, 05:34:17 pm »
Tps went to 10,000rpm and rotated back until it went to 5000 rpm and tightened.
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simonm

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Re: engine diagnosis
« Reply #5 on: 18 July 2014, 05:35:11 pm »
Air inlet unblocked and air filter clean.  I'm assured the fuel filter is clean/new but that's a wildcard atm..
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simonm

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Re: engine diagnosis
« Reply #6 on: 18 July 2014, 05:36:24 pm »
No restrictor kit AFAIK. The bloke doesn't think there is a restrictor fitted .
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chaz

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Re: engine diagnosis
« Reply #7 on: 18 July 2014, 06:45:33 pm »
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.
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