16 replies to this topic

[firefox]

I have twin HS2 carbs and a HIF44 which one would you recomend i will go with the majority

[minijawa]

I just love having twins...........much better to look at and sound great too

[firefox]

I just love having twins...........much better to look at and sound great too

I fully agree but think i am having problems with them dont know if i should change or not or get them sorted

Edited by firefox, 13 October 2011 - 08:51 PM.

[minijawa]

Once you get them set up correctly and balanced then they usually stay ok for years, I had one set though that caused me hassle until I used a rebuild kit on them and then they was fine.

[firefox]

Once you get them set up correctly and balanced then they usually stay ok for years, I had one set though that caused me hassle until I used a rebuild kit on them and then they was fine.

I have spent a bundle on them the only thing i have not changed is the dashpots and pistons and the throtle body's and can i hell get them right

[minijawa]

Only other thing to suggest would be the weight of oil you use in the pots, what filters are you using as I find the usual chrome pancake ones are a killer.

[firefox]

Only other thing to suggest would be the weight of oil you use in the pots, what filters are you using as I find the usual chrome pancake ones are a killer.

I have K&N cone filters but trying to set up with them off, i have some SU/Zenith oil but people on here said 3in1

Edited by firefox, 13 October 2011 - 09:03 PM.

[minijawa]

yeah 3 in 1 tends to work alot better than the official stuff, also check that you using the correct throttle return springs because that can also be a problem.

[Spud_133]

Twins merely for the luck!

[MRA]

Well firstly what size engine are you putting the HIF44 or twin 1.25" SU's on ?

Also 3in1 oil is exactly what SU use.....

A little history, SU or Skinners Union as it's original name was started life as cycle engineers, they progressed to motorcycle engineers as enginesbecome available, 3in1 oil was designed for cycles and as such is ideal for SU carburettors as it is a single grade oil not a multigrade such as engine oil ie 10w40 etc....

The oil that SU currently sell is as far as I am aware 3in1 or at least the same grade and characteristics

[jaydee]

On burlen site is stated somewhere SU oil is a straight SAE 20.
I've used thin 3in1 for the twin hs2, now i'm running a single with sligtly thicker oil (common 10w40 engine oil, 20w50 was too thick for my application). Damper oil have to be choosen to achieve the correct fuel enrichment under accelleration.

[firefox]

Well firstly what size engine are you putting the HIF44 or twin 1.25" SU's on ?

Also 3in1 oil is exactly what SU use.....

A little history, SU or Skinners Union as it's original name was started life as cycle engineers, they progressed to motorcycle engineers as enginesbecome available, 3in1 oil was designed for cycles and as such is ideal for SU carburettors as it is a single grade oil not a multigrade such as engine oil ie 10w40 etc....

The oil that SU currently sell is as far as I am aware 3in1 or at least the same grade and characteristics

Its a 1275 metro engine 12ha83aa

[MRA]

3in1 oil is SAE20.....

Ok, then yes either a HIF44 (fuel economy and ease of adjustment) or twin 1.25" HS2's for little more power, better torque curve and bigger grin factor

[firefox]

Think i will go for the ease of adjustment ******* to the grin factor i nearly put it on the drive today and set it on fire
i just hope it runs better with it on or i will be getting a big hammer to it, i love it and cant wait to get it on the road
but i am running out of patience

Edited by firefox, 13 October 2011 - 10:24 PM.

[firefox]

Well today after a good sleep i have decided to give the twins one more chance i will re-set them again change the dash pot oil give them a good check over jets needles ect and fire her up i will also try and re-route the fuel lines as i am sure the petrol is getting hot and boiling with the heat off the exhaust i have a glass filter and when you turn the engine off it bubbles like mad inside does this have an adverse effect???? anyway here goes

Edited by firefox, 14 October 2011 - 09:17 AM.