Rieju & GasGas Legacy Riders Club Forum  

Go Back   Rieju & GasGas Legacy Riders Club Forum > GasGas Enduro Technical Forums > Enduro Engine 4 stroke (including EFI & Exhaust)

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


Reply
 
Thread Tools Display Modes
  #1  
Old 08-26-2016, 01:53 AM
Tafka Tafka is offline
Senior Member
 
Join Date: Feb 2015
Location: Estonia
Posts: 121
Default FSE 450 2005 idle misfire/stall when hot

Okay...i'm out of ideas.
I have a 2005 FSE450, last year rebuild, new crankshaft,piston,cylinder etc.
At one point, this year, in the middle of the forest, bike started to idle rough(misfire) and then stalls. Starts most of the time easy again and runs a little bit but then again, idle/low revs misfire and stalls if not given throttle.
High revs, everything OK. Some backfire when slowing down. Works fine when cold! but about 20-30min riding, engine getting hot, then the issues start.
Can't ride properly because stalls too often when riding slow forest trails.
Changed and adjusted TPS, new fuel pump, water temp. sensor, checked air temp sensor, fuel injector tested-good spray pattern, no leaks and flow rate ok.
Can't find any air leaks.
My next step would be change:
1) Ignition coil - i think i can find VW analogue (hell no i'm paying $200 GasGas "original" coil if i can get VW coil with $25)
2) Fuel pressure regulator? - PITA to find in Estonia :/
3) Pick-up coil? - does anyone know what should be the gap between pick-up coil and toothed wheel?

Any ideas?


Reply With Quote


  #2  
Old 10-17-2016, 12:43 AM
Tafka Tafka is offline
Senior Member
 
Join Date: Feb 2015
Location: Estonia
Posts: 121
Default

Okay progress so far.
Managed to replace original ignition coil with 2013 Honda CBR coil.
Got a brand new fuel pump assembly with fuel regulator for testing.
Put 2007 MAP to ECU, made things little bit better.
But still after all of this, when engine gets hot, at low revs and sometimes when taking off it feels like engine starves and then pulls nicely. Higer revs, everything fine.
I start to suspect maybe leaking valve(seat)?
Out of ideas....
Reply With Quote
  #3  
Old 10-24-2016, 05:39 AM
Tafka Tafka is offline
Senior Member
 
Join Date: Feb 2015
Location: Estonia
Posts: 121
Default

One more remark....when bike starts to misbehave and i pull over for couple of minutes, let the bike idle, and then start to ride again, it works okay for sometime and then starts to act up again.....so something over heats but what???
Reply With Quote
  #4  
Old 12-17-2016, 10:38 PM
mikethebike1127 mikethebike1127 is offline
Member
 
Join Date: Mar 2014
Posts: 13
Default

Have you checked the fuel tank breather??? Might be partially blocked causing a vacuum in the tank!!
__________________
Racist????.....Not me
I'll race any one !!!!
Reply With Quote
  #5  
Old 12-31-2016, 09:02 AM
Tafka Tafka is offline
Senior Member
 
Join Date: Feb 2015
Location: Estonia
Posts: 121
Default

No issues with the breather
Reply With Quote
  #6  
Old 01-01-2017, 05:25 PM
Nosedive Nosedive is offline
Member
 
Join Date: Dec 2016
Location: Lower Saxony
Posts: 6
Default

Hello,

I know these Issues actually from my 03 FSE.
Please check the valve clearance.
Ex is fine, even about 40k Kilometers after repair.
Can't measure both In-valves, cold 0, think they won't close when hot.
__________________
what clatters does not stick!
Reply With Quote
  #7  
Old 01-02-2017, 12:30 AM
Tafka Tafka is offline
Senior Member
 
Join Date: Feb 2015
Location: Estonia
Posts: 121
Default

Valve clearance is in spec. Just week ago had valves and valve seats grinded/cut and seated. Tought the valves might be leaking when hot but no change.
Reply With Quote
  #8  
Old 01-02-2017, 07:33 AM
Nosedive Nosedive is offline
Member
 
Join Date: Dec 2016
Location: Lower Saxony
Posts: 6
Default

That's fine!
Helps getting closer to the causing part.
The hardware (Motor) is as new,
Software trimmed,
Sensors etc checked,
seems no EFI/fuel/intake problem.
Ignition. Coil is new, so are HV-cable and Plug?
Maybe a brandnew weak spark plug?
Let's think: what else heats up while running: pump relais,
rectifier/regulator,...next step...
__________________
what clatters does not stick!
Reply With Quote
  #9  
Old 01-02-2017, 07:51 AM
Nosedive Nosedive is offline
Member
 
Join Date: Dec 2016
Location: Lower Saxony
Posts: 6
Default

only in german:

from GG mounting instruction
Attached Files
File Type: pdf Zwischenablage01.pdf (128.8 KB, 64 views)
__________________
what clatters does not stick!
Reply With Quote
  #10  
Old 01-03-2017, 12:39 AM
Tafka Tafka is offline
Senior Member
 
Join Date: Feb 2015
Location: Estonia
Posts: 121
Unhappy

Quote:
Originally Posted by Nosedive View Post
That's fine!
Helps getting closer to the causing part.
The hardware (Motor) is as new,
Software trimmed,
Sensors etc checked,
seems no EFI/fuel/intake problem.
Ignition. Coil is new, so are HV-cable and Plug?
Maybe a brandnew weak spark plug?
Let's think: what else heats up while running: pump relais,
rectifier/regulator,...next step...
Tried different spark plugs, still the same.
If relays would heat up, then the problem would be in whole rev range but my problem is only in the beginning....from idle to 3500-4000 rpm....after that its ok. But slipping clutch and holding revs so high in tricky stuff is pain in the a**.
I will try, at some point, to borrow a second injector....i checked my injector but in the test bench the injector doesn't get so hot...so maybe it's still the injector. Pretty much out of ideas....would like to get it running and then sell the bike
Reply With Quote
Reply



Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
400 FSE will not idle when hot Gordonian Enduro Engine 4 stroke (including EFI & Exhaust) 5 08-30-2016 09:49 AM
'05 450 FSE Gear Stick/Engine Stall... bhambaker Enduro Engine 4 stroke (including EFI & Exhaust) 9 04-07-2016 10:50 PM
ec 300 2005 won't rev high nor idle... hannesd Enduro Engine - 2 stroke 23 12-17-2012 01:52 AM
300 won't idle. Please help!! stemplin Enduro Intake/Carburetion - 2 stroke 32 04-05-2012 07:28 AM
can,t get idle up geno Enduro Intake/Carburetion - 2 stroke 1 04-18-2010 08:49 PM




All times are GMT -5. The time now is 01:02 PM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright 2009 - GasGasRider.org