New bike no Exup

[Falcon 269]

Stainless steel bolts will do just as well ...


... unless you're after lightening your bike and your wallet!

[Zundap]

So my exup assy arrived today, all looks good and came apart with not too much grief.
The only bit missing is the little spring which sits behind the pulley.
It's £4 new from Fowlers so can get one of them.


I have now found that on my bike there is no bush fitted in the exhaust where the valve spindle sits, opposite end to pulley.
This is OK because I have a spare bush from the combination of exup bits.
Is it just a matter of cleaning up the bush housing and the bush and it will just slide in or is it gonna be a twat to get in?


Should I put the bush on the valve end and try and fit or fit the bush on its own first?


Anyone fitted one before?


Cheers

[b1k3rdude]

There are 2 bushes -

- One inside the exhaust headers - as you should be putting copperease greese on the end of the valve shaft, the greese will hold the bush onto the end as you insert the valve inso the headers.
- one that sites in the valve end cover - once you clean up the cover the busg will slide in, again put copper greese on it etc.

[Zundap]

That sounds ok


So the bush should just slide into the headers, shouldn't be a tight fit as standard?


Bush slides into cover at pulley end no bother 

[Gnasher]

My five pennyworth.

Ignition advancers are worth fitting but, in my experience, won't come close to restoring what you've lost from not having a working EXUP.

There's no carb mod/tuning solution that will do it, either.

Black Widow headers are no different than the stock headers minus EXUP.  Your results/opinion may vary ...

Take your time and scour ebay/breakers etc for the EXUP valve components.  Early model R1 valves are identical, so search for old R1 exhausts and scavenge what you need from one of them.

:agree

Yep, refit the EXUP, no brainer.  You can still fit a 4* advancer, which will smooth out the power delivery low and mid range, it's not huge but there, fuel consumption will improve slightly as will starting.

Yamaha an many others retard the ignition for the reason pointed out by Grahamm.

The reason the ignition is not usually advanced is that bikes have to be made to run on the crappy fuel that's used in some countries (often because it's been adulterated to save a few pennies). This means that it's best to retard the spark to give the best possible chances of a clean ignition.

UK fuel is good quality, so the spark can be advanced to give more power, but it's still burning the same amount of fuel, just at a slightly earlier point in the piston's travel.

 

[PieEater]

So the bush should just slide into the headers, shouldn't be a tight fit as standard?

As b1k3rdude said grease the inside and outside of the internal bush with copper grease so it sticks on the spindle and it will slide into housing with no force required. It helps if you shine a torch into the exup port so you have a visual image of where you need to insert the spindle.

[Zundap]

So exup valve and cables all fitted and adjusted I think correctly.


Can somebody confirm the 1.5mm free play in cables....


Is it towards and away from the pulley along the length of the the cable or up and down movement like you would measure chain slack/free play?


On ignition on pulley arms sit over rigging hole, on engine start pulley moves clockwise a bit and on revving it moves further clockwise.


Just gonna take it for a run and see how we go ?

[Zundap]

So been out for a ride and wow what a difference an Exup makes!
It's like a new bike, so smooth and it really picks up nicely from low revs, no more flat spot from 3000rpm.


Thanks to everyone for there input, I'm now loving this bike ??

[b1k3rdude]

So been out for a ride and wow what a difference an Exup makes! It's like a new bike, so smooth and it really picks up nicely from low revs, Thanks to everyone for there input, I'm now loving this bike ??

Thats what we are here for :-)

[Falcon 269]

Good news - well done. 

[PieEater]

I'm now loving this bike ??

Good Job, there is definitely a lot to love about a sorted Gen1