Vacuum hose, not sure where to fit...

[Hvornum]

So I've struggled and waited for parts for over a month now, and finally put the engine together and it all works (almost) perfectly.
As soon as a touch the throttle (after getting it to barely start at ~1200 RPM with full choke), it just cuts off instantly and dies. Or if i let it idle at ~1200 for about 5-6 seconds it cuts off as well and dies.

So I poked around and found this bloody hose, obviously I forgot to plug it in.. But I can't for the love of my life find where..


Anyone happens to know where this might belong? If not I'll have to spend countless of hours again trying to locate a suitable place


Edit: I get that this is a long-shot, considering the amount of vacuum hoses there are and since this might not be a original setup with the three vacuum hoses together like that in the front.. But I thought I'd give it a go.
Got 4 vacuum hoses (two from the carburetors tied horizontally into the tank valve thingie, one vacuum hose into the south of the valve and another hose into a tap in the tank.. Not sure where that follows now that i come to think of it tho).

[MacV2]

That's the thicker of the two drain overflow pipes. Fits to the spigot from the bottom of the tank to the left* of the pet-rock. (A in img. )
* When looking from front with tank lifted...

The starting & dying could be the vac hose incorrectly fitted.

It needs to go on the spigot that is on the rear of the pet-rock that points sideways at 90*.(B in img.)

NOT & I repeat NOT the one that points down. Bike will not run if fitted wrong or not fitted at all...

[Jazzscot]

[MacV2]

Also worth checking that you have turned the fuel back on if you turned it off whilst tank was off...

Been there done that...DOH !

[Hvornum]

Hahaha, f*** the "B" one i put on the south-pointing tap on the petcock.. *sigh*..
That's probably where i went wrong

The fule-tap is on tho cause it's gathering a bit of gas in the carburetors between the successful starts (tried starting by giving a bit of throttle which just kills the engine before even starting but injects a lot of gasoline )

[MacV2]

Hahaha, f*** the "B" one i put on the south-pointing tap on the petcock.. *sigh*..
That's probably where i went wrong

The fule-tap is on tho cause it's gathering a bit of gas in the carburetors between the successful starts (tried starting by giving a bit of throttle which just kills the engine before even starting but injects a lot of gasoline )

One word for you...DOH!

Hope that's sorted it for you.


Your not the only one to have done it over the years Hvo, I exclude myself from this as I can claim without hesitation to have never done it.

Accidentally pulled vac hose off & wondered why it wouldn't start...Check

Fitted a tank & it wouldn't start only to discover that the tap was off...check (In my defence it was complete body work swap with Jamie & he had turned it off & not told me & it was weeks before I re-fitted it...)