rough running M750

jerry · 11-04-2018, 04:16 PM

M750 is running sick , starts well , seems to tick over a little off beat at low revs it seems tractable but still not smooth although when balanced all the vacuums are perfect ,, as i accelerate hard it appears to missfire , almost stall like ICE vapour block but its not as it the picks up and revs to redline but its not smooth ,, Carbs were recently cleaned , have swopped igniters and coils from The 750ss and the bad running is still there .. new plugs too

so it is the carbs again , fuel filter which seems clean ??? or ????

lucky the 750ss is purring nicely so im able to enjoy the sun ahem

Mr Gazza · 11-04-2018, 05:04 PM

I wouldn't dismiss the plugs, even though they are new.
Could you try swapping the plugs with the SS?

jerry · 11-04-2018, 05:53 PM

Quote:

Originally Posted by Mr Gazza

I wouldn't dismiss the plugs, even though they are new.
Could you try swapping the plugs with the SS?

done that already Gazza

Mossleymonster · 11-04-2018, 06:32 PM

Plug caps?

bobbertandsammy · 11-04-2018, 07:56 PM

My 900 was a bit like this for a while - rough starting, poor idle and stuttering under load. Turned out to be some dodgy wiring to the ignition boxes. Wee bit of heat shrink later and its grand again.

jerry · 13-04-2018, 07:38 PM

OK so have moved all electronic items from 750ss to monster and the Monster is still off , nasty off beat tick over and erratic running at 5-6k revs almost a massive flat spot and stall then picks up and runs rough to peak revs

must be the carbs again fuel filter changed

with the monsters coils and igniters and leads /plugs the 750ss is sweet running once warmed up

i only just fixed the carbs and no time at present , so will run the 750 ss instead

Mossleymonster · 13-04-2018, 10:09 PM

Two penneth hope I'm wrong but it sounds like a valve.

jerry · 14-04-2018, 07:21 PM

Quote:

Originally Posted by Mossleymonster

Two penneth hope I'm wrong but it sounds like a valve.

thanks ha ha my paranoia ids now at crisis level .....

slob · 14-04-2018, 07:25 PM

.. so business as usual J

jerry · 15-04-2018, 09:53 PM

Quote:

Originally Posted by slob

.. so business as usual J

hmm LOL
still fixing my mates enfield and HD no time to strip the Monster

11-04-2018, 04:16 PM	#1
jerry Old Git Join Date: May 2006 Location: Cricklade Bike: Multiple Monsters Posts: 2,822	rough running M750 M750 is running sick , starts well , seems to tick over a little off beat at low revs it seems tractable but still not smooth although when balanced all the vacuums are perfect ,, as i accelerate hard it appears to missfire , almost stall like ICE vapour block but its not as it the picks up and revs to redline but its not smooth ,, Carbs were recently cleaned , have swopped igniters and coils from The 750ss and the bad running is still there .. new plugs too so it is the carbs again , fuel filter which seems clean ??? or ???? lucky the 750ss is purring nicely so im able to enjoy the sun ahem __________________ MONSTERMAN

11-04-2018, 05:04 PM	#2
Mr Gazza Lord of the Rings Join Date: May 2013 Location: Norwich Bike: M900sie Posts: 5,815	I wouldn't dismiss the plugs, even though they are new. Could you try swapping the plugs with the SS? __________________

11-04-2018, 06:32 PM	#4
Mossleymonster Registered User Join Date: Nov 2017 Location: Barnsley Bike: M1100s Posts: 238	Plug caps? __________________ Always remember. Your home is at risk if you set fire to it.

13-04-2018, 07:38 PM	#6
jerry Old Git Join Date: May 2006 Location: Cricklade Bike: Multiple Monsters Posts: 2,822	OK so have moved all electronic items from 750ss to monster and the Monster is still off , nasty off beat tick over and erratic running at 5-6k revs almost a massive flat spot and stall then picks up and runs rough to peak revs must be the carbs again fuel filter changed with the monsters coils and igniters and leads /plugs the 750ss is sweet running once warmed up i only just fixed the carbs and no time at present , so will run the 750 ss instead __________________ MONSTERMAN

13-04-2018, 10:09 PM	#7
Mossleymonster Registered User Join Date: Nov 2017 Location: Barnsley Bike: M1100s Posts: 238	Two penneth hope I'm wrong but it sounds like a valve. __________________ Always remember. Your home is at risk if you set fire to it.

11-04-2018, 07:56 PM	#5
bobbertandsammy Registered User Join Date: Jun 2012 Location: Hamilton Bike: M900 Posts: 196	My 900 was a bit like this for a while - rough starting, poor idle and stuttering under load. Turned out to be some dodgy wiring to the ignition boxes. Wee bit of heat shrink later and its grand again.

14-04-2018, 07:25 PM	#9
slob . Join Date: Jul 2003 Location: East London Bike: Multiple Monsters Posts: 9,712	.. so business as usual J