154 replies to this topic

[wigwamclan]

I'll do it now

[wigwamclan]

so, I fitted the new air filter, shorted the disconnected wires for 30 seconds, left the battery disconnected over night an' tried it this morning.......no change : (

[Studley Ramrod]

So is it running rough at low revs and fine at mid to high revs ?

[wigwamclan]

So is it running rough at low revs and fine at mid to high revs ?

 

 

it'll start, tick over an' pick up ok......if I try hand hold the rpm at around 2500 there's a li'l bit of hunting but if I open the tap full, instead of it pulling like a train which is what it used to do, it bogs down i.e. it very slowly picks up to around 3500-4000 at which point it picks up like a good 'un.

 

When i give it full beans, If I back off a touch as it starts to bog down it'll pick up ok also if i don't give it full beans it pulls smooth....there's noticable hesitation (feels a bit like a flat spot) at around the 4000 mark..it's not right but it's usable.

 

The real issue is when I try to pull out from behind someone to over take quickly, an' there's a truck coming the other way an' nothing happens : (

[wigwamclan]

 IMAG0097.jpg   108.32KB   0 downloads

 

Just pulled the plugs

[Studley Ramrod]

Wonder if it could be a sticking CSM or a blocked air filter ?  Looks like it's running rich.

[wigwamclan]

Air filter's brand new this morning....what's the CSM?

[Studley Ramrod]

The cold start mechanism.

[Catteeclan]

Does the manual call this a cold start mec?

All it does is hold the revs up, mixture is controlled by the ecu.

[TYREDNGRUMPEE]

it'll start, tick over an' pick up ok......if I try hand hold the rpm at around 2500 there's a li'l bit of hunting but if I open the tap full, instead of it pulling like a train which is what it used to do, it bogs down i.e. it very slowly picks up to around 3500-4000 at which point it picks up like a good 'un.

 

TPS or ECU+fueling or timing.

The clue is in the engines reluctance to pull through on a wide open throttle - very un-TDM and then there is the good behaviour at the bottom and top end of the range to take into account.

 

Also, I'd add

Given that it was "running normally", then on later inspection you found any number of glaringly bad faults in the wiring, battery and HT circuits that would have otherwise knobbled any other self respecting 900, do you think that there may be some other detail that you are overlooking or choosing to ignore?

I'm not a 900 owner, so I'll shaddup now.

Edited by TYREDNGRUMPEE, 05 August 2016 - 07:49 pm.

[TYREDNGRUMPEE]

Thinks.

40k?

Do you know for sure that the valve clearances have been checked properly?

100 bucks on TIGHT valve clearances.   - hence the sudden unexpected, but now regular, warm engine foibles.

Edited by TYREDNGRUMPEE, 05 August 2016 - 08:38 pm.

[Studley Ramrod]

Does the manual call this a cold start mec?

All it does is hold the revs up, mixture is controlled by the ecu.

 

What d'ya call a deer with no eyes ?  No idea.

 

I was kinda equating the CSM with the choke mech on a carbed bike tbh.

[wigwamclan]

Thinks.

40k?

Do you know for sure that the valve clearances have been checked properly?

100 bucks on TIGHT valve clearances.   - hence the sudden unexpected, but now regular, warm engine foibles.

 

There's a bunch of receipts for work done, including ones for shims, plus it makes quite a bit of rattle noise so my guess would be that it's been done

[wigwamclan]

just had the plugs out and tried the coils with the OBD but I got no spark on either plug.......am I doing something wrong?

[Studley Ramrod]

Are you earthing the plug ?

[wigwamclan]

Tried earthing it to the exhaust and the engine mount bolts too..... No sparking on either

[Studley Ramrod]

Hmmm, should get a spark if it's earthed properly. Is it possible to get the wires to the coil crossed ?  What's an OBD ?

[wigwamclan]

Sorted it...... I was just flicking the start switch instead of holding it on... Sparks look weak tho

[wigwamclan]

Hmmm, should get a spark if it's earthed properly. Is it possible to get the wires to the coil crossed ?  What's an OBD ?

 

On Board Diagnostics : )

[wigwamclan]

found a discrepancy in the temp sensors.....both coolant temp and air intake temp are reading way above what actual temps are!

 

Any ideas why?

 

BTW, when I unplug the sensors they both give a OBD reading of -22......is this normal?

Edited by wigwamclan, 07 August 2016 - 07:17 pm.