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Enduro Engine 4 stroke (including EFI & Exhaust) 4 stroke engine, EFI, and exhaust discussion


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  #11  
Old 01-03-2017, 03:30 PM
Nosedive Nosedive is offline
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almost causing headaches...

Two more Oks.
You've already done a lot of good work, man.
Plenty new Parts, lots more checked,
Another injector-test helps.
Don't know much about injectors... thought, good spray or bad spray. Would be nice to let me know the results.
Still got suspicion on ignition.
Can there be a timing-problem when getting hot?
Thinking about the pick-up, heat issue, resistance to engine rpm.
Theory, too early timing (sparking) when hot causes rough run, but less affects at higher revs. Might it feel so?
Improbable, but there's an Info from GG about the flywheel, bent pin causes offset:
only german. Hope it helps.
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  #12  
Old 01-04-2017, 12:40 AM
Tafka Tafka is online now
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I don't think it would be pickup coil....resistance seemd ok cold and hot....usually pickup coil works or not, at least i have fixed some engines with bad pickup coil, on those engines the pickup coil stopped working at all or when they got hot then also stopped but when cooled down started working again....haven't seen pickup coil that works ok on high revs and bad at low revs.
But i will double check.
The original injector got tested in the bench when cold and had very good spray pattern and flow rate was in spec.
It feels like the engine fuel mixture gets too lean when hot...when adjusting the CO trim with guzzidiag, it gets little bit better but the problem is still there.
Are you sure that the pickup coil data on your picture is correct? I have a different pickup coil than on your second picture....
I think they changed that in 2003-2004?
If i'm not wrong then the newer pickup coil resistance should be around 500 ohms. Maybe you can find data for newer pickup coil? It's okay if it's in german...have learned german a little bit in school

EDIT: One more thing, that could eliminate the pickup coil....when standing still and let it idle....it usually idles good. When trying to give throttle then theres 40:60 chance that it will rev okay or will sputter/die. So basically the sputter is really bad when there is load...so i would think theres something wrong with the fuel mixture (or timing). But why did that problem start just randomly in the middle of one ride.... :/
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  #13  
Old 02-16-2017, 06:50 AM
Karlos Karlos is offline
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Hi mate, all the work you have done sounds reasonable. Just foraleft Reid view point, I am having a similar issue with mine. I was told to check coil etc. but tonight looking at the service report the mechanic has put an extra 400ml of oil in the sump for me. 1.6l instead of 1.2. You mentioned a rebuild, have you had a look to see that the oil isn't the cause?
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  #14  
Old 02-17-2017, 12:25 AM
Tafka Tafka is online now
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Have made many oil changes after rebuild (i usually change oil after 10 hours).
Different oils, different amounts....
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  #15  
Old 03-06-2017, 12:39 AM
Tafka Tafka is online now
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Okay, changed the pickup coil as some recommended. But still no change...about one hour of riding and starts to act up as always.
So at the moment I can think of only two things left:
1) Try some other injector (chinese injector was crap)
2) ECU (something shitty going on there maybe? Visually didn't see any cold solders...)
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  #16  
Old 04-12-2017, 01:53 PM
Tafka Tafka is online now
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Hellllloooo....it's meeee agaaaain.
Okay...got used but working Ducati injector and things got little bit better.
First ride alone i had only few hickups but otherwise everything worked okay...i was happy at that point.
So today i went for a ride with friends and after few whoooops it started again....like misfire at low revsm slipping the clutch. At one point i just had to stop, it stalled. Started it again, fired up, little touch of throttle and stall again...and this continued many times, as soon i touched the throttle, it stalled.
So i started the bike WOT and got moving again. Worked decent for a while.
At some point it stalled again but not tooooo bad. So i rode the whole ride like this....somepoint works good, then again f**s my nerves.
Someone got matches?
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  #17  
Old 04-17-2017, 06:01 AM
Yngvim Yngvim is offline
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Was looking at the ignition map and at 6000 rpm is the last value, is it running ok between 4 and 6000 rpm

EC 250 2001, FSE 450 2004
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  #18  
Old 04-17-2017, 06:12 AM
Tafka Tafka is online now
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Bike runs great above idle...if i can hold the throttle up at least 3500-4000 rpm, then everything seems to run great. But riding tight forest trails and considering i don't have balls to ride with open throttle then the problems start. So rev range about 2000-3500.
Slipping the clutch a lot but even then i struggle....get the revs up,slip the clutch, clutch engages, revs drop a little bit too low and it starts to skip beats.
It's not like stalling because of the low revs...that's little bit different.
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  #19  
Old 04-19-2017, 02:19 AM
Tafka Tafka is online now
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Anyone have any more suggestions?
Let's brainstorm....
What are the chances that ECU is bad? (then it wouldn't work at hig revs also...?!)
Too tight valve clearence? At the moment they are in spec (closer to the min. value) but maybe loosen them a little bit?
Crankshaft/connecting rod bearing f***d again? Symtoms are similar before i replaced the crankshaft/cylinder/piston but started suddenly and appear only when hot.
Decompressor spring too weak, so it starts to open exhaust valves at low revs? What are the chances of that happening? Decopressor looks working when moving it with finger but MAYBE somehow at low revs engages. How to check that?
Anyting else....?
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  #20  
Old 04-19-2017, 03:05 AM
Yngvim Yngvim is offline
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Does it matter what map you run?

EC 250 2001, FSE 450 2004
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