Roadside diagnostic and fix test

[Mark_h]

Originally Posted by daddyjob

I reckon you pinched a throttle cable. The throttle body butterflies aren't opening enough to create suction to open the butterflies that operate in the airbox allowing the air in. Only at 5,000rpm does it have enough suction to partially open them, before closeing and then suffocating the engine.

So what do I check? And how on the side of the road?

Note I've done 80+ miles since fitting grips

[Mark_h]

Originally Posted by Fallout

The problem with this whole challenge is we're not guessing what the problem is, we're guessing exactly what Mark himself did, down to each individual arsse cheek scratch and expletive uttered. And getting into the head of DaddyGroom is something neither easy nor pleasant.

Nope I'm asking what you'd do.

[DJ123]

routing of the throttle cables. Make sure they're not trapped or chaffed through causing them to snag. After 80 miles that's enough to wear through the outer cables. Edge of the road it's easy, you've already got the tank up.

[Fallout]

Originally Posted by Mark_h

Nope I'm asking what you'd do.

Ok, what I'd do is undo what I did in the morning, in case over time something has moved. So I'd take those old man hand guards off to start with and see if I messed anything up there. Then I'd work my way back from the throttle, making sure the grip moves properly, checking the cable etc.

[Mark_h]

Originally Posted by daddyjob

routing of the throttle cables. Make sure they're not trapped or chaffed through causing them to snag. After 80 miles that's enough to wear through the outer cables. Edge of the road it's easy, you've already got the tank up.

Good question ...
Throttle butterflies open and close when throttle opened and closed.

[DJ123]

do the ones above them, the vacuum operated butterflies move when the engine is on?

[Mark_h]

Originally Posted by daddyjob

do the ones above them, the vacuum operated butterflies move when the engine is on?

Not running long enough to know but it should at least tickover even if they don't move

[DJ123]

unless they are in the fully closed position. They should always be 'open' to some degree. When you switch the ignition on they should fully open then return to the default angle.

[Mark_h]

Originally Posted by daddyjob

unless they are in the fully closed position. They should always be 'open' to some degree. When you switch the ignition on they should fully open then return to the default angle.

They did the full range cycle then stopped just short of shut which is normal and should be enough for it to tickover,

In general butterflies and throttle action seem OK and in sync when viewed from above the airbox looking into the bodies.


I need to go do other stuff now so will answer further questions tomorrow.

[DJ123]

So intake is good which is one demon sorted. Fuel and spark would be the next things i would look to.