![]() |
Register | FAQ | Members List | Calendar | Today's Posts | Search | Contact | ![]() |
![]() |
|
![]() |
![]() |
Registered
Members: 635 | Total Threads: 50,819 | Total Posts: 518,477 Currently Active Users: 924 (0 active members) Please welcome our newest member, Bunnyrides |
![]() |
|
![]() |
|
Thread Tools | Display Modes |
![]() |
#1 |
Registered User
Join Date: Apr 2017
Location: Dublin Ireland
Bike: M900
Posts: 298
|
Over Fueling only top cylinder
1997 M900
New Fuel filter New spark plugs NGK 8eix (iridium) New choke cable Took her out for a 80km ride, after roughly 60km she only started working on 1 cylinder, took out the plugs , front is fine , top plug stinks of fuel , cleaned , she's on two cylinders again 80km she used most of the full tank Any ideas , iridium ? I had NGK dcpr8e |
![]() |
![]() |
![]() |
#2 |
Registered User
Join Date: Aug 2011
Location: Southampton
Bike: M1100evo
Posts: 2,465
|
Did you ensure that the gap was correct. You can't run the iridiums on the standard 0.7ish - they need 0.9 - 1mm to work properly.
I've had them on my Evo for six years with no problems. More info here: http://www.ukmonster.co.uk/monster/s...72&postcount=4 http://www.ukmonster.co.uk/monster/s...2&postcount=12 |
![]() |
![]() |
![]() |
#3 |
Registered User
Join Date: Oct 2019
Location: Chorley
Bike: M900
Posts: 160
|
Did you buy your plugs from a reputable supplier? There are a lot of NGK fakes out there.
__________________
Contents may settle ! |
![]() |
![]() |
![]() |
#4 |
Registered User
Join Date: Apr 2017
Location: Dublin Ireland
Bike: M900
Posts: 298
|
Thanks , I will check the gap
Will put in the old plugs to test first, they worked fine Does each carb on the bike supply a specific cylinder i.e. Carb 1 supplies top cylinder with fuel/air, carb 2 supplied lower cylinder ? If I do need to chase fueling for the top cylinder be good if I can narrow it down to a specific carb, float bowl height , needles ....will all need to be checked and cleaned next if plug gap is not the issue |
![]() |
![]() |
![]() |
#5 |
Registered User
Join Date: Apr 2017
Location: Dublin Ireland
Bike: M900
Posts: 298
|
|
![]() |
![]() |
![]() |
#6 |
Registered User
Join Date: Oct 2019
Location: Chorley
Bike: M900
Posts: 160
|
Sorry I don't know the answer to this ( Luddite will know ! ) but do M900 have resistor type plug caps as standard ? You really need non-resistor caps to fire an iridium plug efficiently .I'm guessing our old style ignition systems are already being challenged by these plugs.
__________________
Contents may settle ! |
![]() |
![]() |
![]() |
#7 |
Registered User
Join Date: Aug 2011
Location: Southampton
Bike: M1100evo
Posts: 2,465
|
|
![]() |
![]() |
![]() |
#8 |
Registered User
Join Date: Apr 2017
Location: Dublin Ireland
Bike: M900
Posts: 298
|
I am better off running a copper plug?
|
![]() |
![]() |
![]() |
#9 |
Registered User
Join Date: Aug 2011
Location: Southampton
Bike: M1100evo
Posts: 2,465
|
...or nickel or platinum. I have iridiums in my Evo and they've been fine for 6 years. Their main claimed advantage over standard plugs is a much longer life as the iridium is much more resistant to spark erosion than, say, copper. The thinner electrode and larger spark gap is also supposed to give a bigger spark for better combustion.
But, if you have any doubts, stick to tried and tested copper. |
![]() |
![]() |
![]() |
#10 |
Lord of the Rings
Join Date: May 2013
Location: Norwich
Bike: M900sie
Posts: 5,848
|
Surely that's a Copper core not a Copper electrode?
__________________
|
![]() |
![]() |
![]() |
#11 |
Registered User
Join Date: Aug 2011
Location: Southampton
Bike: M1100evo
Posts: 2,465
|
Correct as always, Mr G. Brain fade I'm afraid
![]() |
![]() |
![]() |
![]() |
#12 |
Registered User
Join Date: Apr 2017
Location: Dublin Ireland
Bike: M900
Posts: 298
|
Iridium's where at 1mm gap , I must of done them a while back and forgot
Coppers are 0.8mm gap Appears to be working fine on the coppers , my m900 one of the early production bikes , I don't think it like iridium's |
![]() |
![]() |
![]() |
|
|