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Jun 7th, 2008, 4:42 am
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#1 (permalink)
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Senior Member
Join Date: May 2008
Location: Goulburn, NSW, Australia
Posts: 105
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Stumble just off idle
Ok guys i have had a bit of time in the shed with the hyper and have done the top airbox hole but kept the std filter, emptied out the cat, flap open and opened up the std exhaust a little.
Now when the bike is idling and i snap to full throttle it stumbles for about a second then revs normally. Im not 100% if it will happen at full riding temp but it had been running for about 5 mins in the shed, so should of been warm.
So how do i go about fixing it?
Is it an ecu issue?
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Jun 7th, 2008, 4:51 am
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#2 (permalink)
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Senior Member
Join Date: May 2008
Location: DC, MD, VA, , USA
Posts: 266
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Get her out of the shed. 
Sorry, couldn't resist. It's late/early. I'm no expert so I will sit back and learn from the masters on this forum.
__________________
'08 HM 1100 S
Termi 2-2 slip on, DP race header, DP race seat, DP steering damper, DP airbox lid, DP race cams, DP race ECU (cam version), DP CF clutch cover, BMC Filters, Pistal hi-comp pistons, ported heads by BCM, Piazzo short levers, Shift-Tech CF tank cover, S-T CF hugger (4 pieces), S-T CF sprocket cover, S-T CF ignition cover, S-T CF Windscreen, S-T CF gauge cover, Rizoma reservoirs, EVS pressure plate, EVS clutch slave cylinder. HP: never enough Torque: see HP 
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Jun 7th, 2008, 4:55 am
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#3 (permalink)
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Senior Member
Join Date: May 2008
Location: Goulburn, NSW, Australia
Posts: 105
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Quote:
Originally Posted by tunefx
Get her out of the shed.
Sorry, couldn't resist. It's late/early. I'm no expert so I will sit back and learn from the masters on this forum. |
Thanks for the advice  But we are going out for a good ride tomorrow
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Jun 7th, 2008, 6:11 am
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#4 (permalink)
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Member
Join Date: May 2008
Location: Perth, West, AUSTRALIA
Posts: 46
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fuel
Hi mate, you are probably best off taking it to someone with some diagnostic gear. The problem you have is you have let the engine breathe and exhaust better which is good... but... the factory computer is not tuned to allow the mods you have done. The factory computer is lightly tunable with the factory equipment. You will more than likely have to put a few points of fuelling into that area. ALSO, get the throttle body balance set spot on. We see a lot of bike come in that have had service work done but not the balance... IT makes a huge difference. make sure tho, that they adjust it on the linkage NOT the air screws. hope that helps you out.
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Jun 7th, 2008, 6:16 am
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#5 (permalink)
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Senior Member
Join Date: May 2008
Location: DC, MD, VA, , USA
Posts: 266
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'ava good weend! Transport me to OZ!
__________________
'08 HM 1100 S
Termi 2-2 slip on, DP race header, DP race seat, DP steering damper, DP airbox lid, DP race cams, DP race ECU (cam version), DP CF clutch cover, BMC Filters, Pistal hi-comp pistons, ported heads by BCM, Piazzo short levers, Shift-Tech CF tank cover, S-T CF hugger (4 pieces), S-T CF sprocket cover, S-T CF ignition cover, S-T CF Windscreen, S-T CF gauge cover, Rizoma reservoirs, EVS pressure plate, EVS clutch slave cylinder. HP: never enough Torque: see HP
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Jun 7th, 2008, 9:58 am
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#6 (permalink)
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Lifetime Premium
Join Date: Jul 2007
Location: San Mateo County, CA, USA
Posts: 661
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Quote:
Originally Posted by ProTwinSteve
... the factory computer is not tuned to allow the mods you have done.
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I also believe this is the issue.
__________________
Bill
2008 KTM 990 Adventure
2007 KTM 640 Adventure
2004 KTM 300 EXC
2003 KTM 525 EXC
1991 Ducati 851
1978 Moto Guzzi Lemans I
1974 Yamaha RD350
1931 Moto Guzzi 2VT
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Jun 7th, 2008, 11:15 am
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#7 (permalink)
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Senior Member
Join Date: Aug 2007
Location: Aromas, CA, USA
Posts: 860
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I have done exactly what you have done (exhaust gutted and airbox lid) and oh what a difference the cam ECU made. You are simply too lean. I am guessing that you get a nice bit of rumble and popping when you are decelerating with the throttle closed. You can get a Rapid Bike 3 module with a oxygen sensor emulator, get a Power Commander III USB or buy the cam kit for the ecu. I doubt you could ever get enough fueling with a tuned stock ecu.
__________________
Lelen
Hyper S
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Jun 7th, 2008, 4:03 pm
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#8 (permalink)
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Senior Member
Join Date: Jun 2007
Location: Phx, Arizona, USA
Posts: 2,410
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I agree with a couple of the posts above. It is most likely because your electronics now are not in tune with what you have done so to fix the issue it will need to be put on the Dyno to see if it is tunable with the stock ECU (which it most likely isn't) or you can get a performance ECU that can be tuned to work properly. This will still take someone who knows how to tune it and has the capable tools to do the job. You might also want to look into getting a PC for it and see if that will work with the proper tuning. Goodluck
__________________
MOTARD-MENACE
07 BMW F800S
"If you can't fix it with a hammer, you've got an electrical problem."
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