Joaoduarte Posted April 9, 2020 Share Posted April 9, 2020 If you flashed the ecu and the tuner changed fueling in closed loop Then your bike is going to run really bad, because the ecu in closed loop low rpm is going top use the new fueling map in ecu, but the o2 sensor Is going to battle it giving you that jerkiness and low power. So what i suggest you is disconnect the o2 sensor in the plug And retest. If i change my power commander fueling at low rpm With the stock o2 conected it does what you say low power jerkiness because the o2 sensor is battling my changes of fueling on high rpms it feels fine because the ecu runs fuel map in open loop so it bases fueling based only on ecu mapping Link to comment Share on other sites More sharing options...
Joaoduarte Posted April 9, 2020 Share Posted April 9, 2020 Now i read it again and i saw that the bike is stock try removing the O2 sensor and see how it feels.i think that is your problem although you changed it you have it connected. Just disconnect it from the harness under Theo side protection and see how it feels. It costs you nothing and you can see imeaditly if the problem is the o2 readings and closed loop battling Link to comment Share on other sites More sharing options...
Joaoduarte Posted April 9, 2020 Share Posted April 9, 2020 From what i saw is that if in anyway the fueling was changed in anyway (i saw it With wideband sensor) if it battles the changes the fueling would be a completei mess going from too lean to too rich and it would be doing it over and over but just in low rpm (where the sensor Works) Link to comment Share on other sites More sharing options...
Groflan Posted April 26, 2020 Author Share Posted April 26, 2020 Hi every one and many thanks for your help. geophb, I have already checked all these things Today en paris, the wethaer is butefull, et and i decided ton open the motor. And the result : Is it a disaster? Link to comment Share on other sites More sharing options...
Groflan Posted April 26, 2020 Author Share Posted April 26, 2020 the following Link to comment Share on other sites More sharing options...
shinyribs Posted April 27, 2020 Share Posted April 27, 2020 I don't see any obviously damage on any parts in the pics. The shiny tips on the cam lobes is perfectly normal. Interesting to see cast iron cylinder liners? I thought these were plated motors. I like sleeves better. 1 Link to comment Share on other sites More sharing options...
geophb Posted April 27, 2020 Share Posted April 27, 2020 31 minutes ago, shinyribs said: I don't see any obviously damage on any parts in the pics. The shiny tips on the cam lobes is perfectly normal. Interesting to see cast iron cylinder liners? I thought these were plated motors. I like sleeves better. I am surprised too if it is. Looks to me, more like gasket residue and combustion deposits that make it look like a sleeve. 2 Link to comment Share on other sites More sharing options...
Mechie Posted April 27, 2020 Share Posted April 27, 2020 Wait, I'm confused. Why did the engine get tore down? Did you do a leak down or compression test? What was results of a vacuum leak or o2 sensor check? Seems extreme to pull the engine down just to see. Good news it all looks normal from the pics. 2 Link to comment Share on other sites More sharing options...
shinyribs Posted April 28, 2020 Share Posted April 28, 2020 17 hours ago, geophb said: Looks to me, more like gasket residue and combustion deposits that make it look like a sleeve. I believe you are right about that. Looks much different on a laptop than it did on my phone haha 1 Link to comment Share on other sites More sharing options...
topazsparrow Posted April 28, 2020 Share Posted April 28, 2020 (edited) Good time to port and polish that head You can see the factory cross hatching on the cylinder walls still. Looks like its in good shape. Edited April 28, 2020 by topazsparrow 2 Link to comment Share on other sites More sharing options...
Groflan Posted May 2, 2020 Author Share Posted May 2, 2020 On 4/27/2020 at 6:13 PM, Mechie said: Wait, I'm confused. Why did the engine get tore down? Did you do a leak down or compression test? What was results of a vacuum leak or o2 sensor check? Seems extreme to pull the engine down just to see. Good news it all looks normal from the pics. I did a compression test and found only 0.5 bar difference. I have no vacuum leaks and did the test well with the O2 probe. No result Yesterday, I tested a used cylinder head, new cylinder head gasket, valve clearance control. Once reassembled: no real difference. The only part I haven't tested and replaced yet is the Pick-up Assy.. I am very tired Link to comment Share on other sites More sharing options...
Groflan Posted May 8, 2020 Author Share Posted May 8, 2020 Fixed Bought 2019 engine used with 1500 milles for 450 $ (500 €) on accidented bike Ans it works great Thanks everybody for help 1 Link to comment Share on other sites More sharing options...
geophb Posted May 8, 2020 Share Posted May 8, 2020 26 minutes ago, Groflan said: Fixed Bought 2019 engine used with 1500 milles for 450 $ (500 €) on accidented bike Ans it works great Thanks everybody for help Okay now that bugs me because we still don't know what was causing it. Glad its fixed though. 2 Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now