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Author Topic: Revs fall slowly - not enough engine braking  (Read 10916 times)
greenmonster
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« Reply #30 on: September 15, 2022, 01:27:42 AM »

Quote
   I had the TPS checked and reset twice. 2.5 (mV?) both times.

2,5 degrees, 423 mV.

Is the ignition map also a custom map?
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stopintime
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« Reply #31 on: September 15, 2022, 08:15:19 AM »

2,5 degrees, 423 mV.

Is the ignition map also a custom map?

I don't know. I assume not, since I was never told it is.
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ducpainter
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« Reply #32 on: September 15, 2022, 03:32:57 PM »

I've been around a while, and have never seen a center electrode completely disappear on a 4 stroke, They'd partially dissapear on 2 srokes, and the manufacturers came out with electrodes that would stand the gaff.

Something is going on, and I have no clue as to what it is.
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koko64
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« Reply #33 on: September 16, 2022, 03:53:16 AM »

Same here, worn down yes, but completely gone, never.
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stopintime
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« Reply #34 on: September 16, 2022, 06:20:11 AM »

... I wonder if a fuel map, functioning well on the Dyno, can get digitally lost (forgot to press ENTER kind of thing) and be automatically/accidently replaced by ECU stock info. It could explain a lot.... also the poor performance/top speed.

In that case the worst plug might have become THAT bad because of the spacer leakage, but would have shown clear signs of lean running anyway - like the other plug.

The shop usually steps up in cases like this. Because of geography it won't be easy to get anything done before next July. I will be able to check the plugs and establish if the spacer was the main cause for the destruction of the plug tip.
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Howie
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« Reply #35 on: September 16, 2022, 08:59:22 AM »

Just the positive electrode gone and the rest of the plug intact is new to me too.  Unbelievable that plug was able to fire.
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greenmonster
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« Reply #36 on: September 19, 2022, 04:55:38 AM »



Overheating?
Too lean mixture due to
1. squashed spacer
2. map too lean for that cyl, offset map mishap
?
« Last Edit: September 19, 2022, 04:57:14 AM by greenmonster » Logged

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« Reply #37 on: September 22, 2022, 02:17:45 PM »

Vertical (where the heat was most evident)
It looks hot.
1,000-1,500 km






Horizontal
(also hot)



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diamonddog-2
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« Reply #38 on: October 07, 2022, 01:34:20 PM »

 popcorn
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stopintime
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« Reply #39 on: December 19, 2022, 07:13:17 AM »

Leak down test + sensors diagnostics coming up, but first suspension work and snow shoveling  bacon
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« Reply #40 on: December 19, 2022, 09:40:27 AM »

Looking forward to seeing the diagnostics results. waytogo

White plugs with tiny black spots or just white?
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« Reply #41 on: February 15, 2023, 03:50:04 PM »

The plug diagnostics might not be worth much after just 1,000 - 1,500 km.

TPS still ok. The only two/three other engine sensors (old tech) ambient temp, barometric pressure and engine temp were functioning well (BTW: for those who ever wondered... the dash temp from the sump reads equal to the engine temp from the head)

Leak down test done yesterday:
cold test good 15 - 20% vertical, but ~70%  Shocked on the horizontal. (Don't get so excited just yet)
Warm up to 120 degrees Celsius..... just over 100 degrees there's smoke gushing out of the air box  Shocked Shocked  Ok, so it was actually steam. We got rid of most of it (and later drained the oil). The air box was full of water from the two wet autumn months (when I didn't ride at all) and water came into the horizontal intake - maybe causing rust here and there.
Warm test good on both cylinders.


I'm glad that no serious and expensive damages were found, but I expect the bike to still under-perform. I won't know until spring. The only thing I have 'fixed' is the squashed plug washer and it's hard to know if that was the only thing wrong. What I don't like is that I'm now without a clue about what's next...

Injectors? We have very clean fuel here, so ..... (230,000 km old)
False air tested with Kent One Shot made for that purpose (and cleaning intake parts/ports)
Fuel filter? (150,000 km old)
The ECU map is good (if it was good on the Dyno it can't change by itself)
Coils? (230,000 km old)

Thoughts, ideas, suggestions?

« Last Edit: February 15, 2023, 03:53:26 PM by stopintime » Logged

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greenmonster
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« Reply #42 on: February 16, 2023, 06:17:03 AM »

My manual for my MTS doesn't mention fuel filter change (!) but 150 000 it is overdue.
Despite clean fuel, 230 000 on injectors is. also overdue I guess.

So, filter (and eventually injectors) makes it a little lean when no throttle and causing
engine to take more time to get to idle. Just guessing here... Roll Eyes
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« Reply #43 on: February 16, 2023, 07:00:22 AM »

Change the filter first.
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stopintime
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« Reply #44 on: February 16, 2023, 11:43:12 AM »

Change the filter first.

 waytogo thanks!
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237,000 km/sixteen years - loving it
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