Fitted H2 UFO's ?

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Fitted H2 UFO's ?

Postby Tangoman » Tue Sep 11, 2018 9:53 am

Hi All

If you have fitted H2 UFO's , would you like to sell the left over spring seat plate ? , the little disc that goes over the jet needle that sits at the base of the slider .
Cash waiting .
Thanks for looking

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Re: Fitted H2 UFO's ?

Postby H2R » Tue Sep 11, 2018 11:23 am

Isn't this still needed, with or without UFOs?
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Re: Fitted H2 UFO's ?

Postby Tangoman » Tue Sep 11, 2018 11:32 am

The UFO kits are supplied with a modified spring seat plate , so that the UFO's can be screwed into the end of the slider , so the normal plate will no longer fit .
Hence the request for any one who wants to sell there old ones Thumbs Up Thumbs Up Thumbs Up

All the best
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Re: Fitted H2 UFO's ?

Postby H2R » Tue Sep 11, 2018 11:37 am

I learn something every day. Didn't know this, thanks for the info!
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Re: Fitted H2 UFO's ?

Postby Peter Mac » Tue Sep 11, 2018 3:15 pm

Sits in like this making the old washer redundant ... Thumbs Up
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Re: Fitted H2 UFO's ?

Postby Windy » Fri Sep 14, 2018 9:41 am

My question is do ufos work?
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Re: Fitted H2 UFO's ?

Postby Wolfie » Fri Sep 14, 2018 11:41 am

Pete has got plenty of sets out there and they work well according to the fittees...

However in light of your previous mails, it's probably better to iron out issues first then add the UFOs as you will need to rejet afterwards anyway, the Pilots mainly, they will need approximately halving in size.

I presume that this is due to the extra speed of the air passing over the venturi giving a greater suction at lower throttle openings.
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Re: Fitted H2 UFO's ?

Postby Peter Mac » Fri Sep 14, 2018 1:56 pm

Windy wrote:My question is do ufos work?


Have them in three of my triples now ..

Most change is with 750's & low speed throttle response is improved & surging reduced to insignificant .. On the 500 i find improved torque down the bottom end so when you are about to overtake it takes less planning than before :lol:

There are alot of sweet running triples around the world & i was suprised by how many run slide inserts & have done for years once i asked a similar question Thumbs Up
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Re: Fitted H2 UFO's ?

Postby Akashi Classics » Sat Sep 15, 2018 3:29 am

Sorry if this question has been asked before, but are the UFO’s an alternative to an Ivan’s kit, or used in conjunction to an Ivans?
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Re: Fitted H2 UFO's ?

Postby Wolfie » Sat Sep 15, 2018 7:37 am

Either / or.

They are two separate upgrades, you can do as much or as little as you like,
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Re: Fitted H2 UFO's ?

Postby Windy » Sat Sep 15, 2018 4:14 pm

Ey up wolfie

My problems were solved by removing the ivan kit which transformed the bike back to the fun h2 it was! Surging is worse but i prefer that to the other issues the ivans brought. Also got me some higgspeeds to play with now. After 30 years I fancied a change!

May have a dabble with ufos once the pipes are set up.
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Re: Fitted H2 UFO's ?

Postby SAM » Sat Sep 15, 2018 5:46 pm

Higgspeeds add a dimension compared to standard pipes. Tend to need minor adjustment from standard. I've just run one size over on mains.
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Re: Fitted H2 UFO's ?

Postby Windy » Sat Sep 15, 2018 8:42 pm

Thanks Sam

Im on 105s if i remember correct so i will prob start on 107.5. Std airbox but no inlet snorkel.
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Re: Fitted H2 UFO's ?

Postby Turkish » Sun Sep 16, 2018 4:24 am

Windy wrote:Thanks Sam

Im on 105s if i remember correct so i will prob start on 107.5. Std airbox but no inlet snorkel.


107.5 mains 35 pilots. if you use UFO's 17.5 pilots, air screw out another quarter of a turn. that seem to be the general rule of thumb.
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Re: Fitted H2 UFO's ?

Postby vicar of pev bay » Sun Sep 16, 2018 9:35 am

Turkish wrote:
Windy wrote:Thanks Sam

Im on 105s if i remember correct so i will prob start on 107.5. Std airbox but no inlet snorkel.


107.5 mains 35 pilots. if you use UFO's 17.5 pilots, air screw out another quarter of a turn. that seem to be the general rule of thumb.


Where would you get the 17.5 pilot jets from
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Re: Fitted H2 UFO's ?

Postby Tangoman » Sun Sep 16, 2018 11:29 am

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Re: Fitted H2 UFO's ?

Postby Wolfie » Sun Sep 16, 2018 11:39 am

I was about to suggest making some Mark, it can't be too difficult co cut a circle then cut a Pizza slice out of it.

But good to hear you're sorted.
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Re: Fitted H2 UFO's ?

Postby Windy » Mon Oct 08, 2018 8:44 pm

Higgspeeds fitted. WOW sounds and goes brill. The sound of the exhausts makes the engine quieter too!

It all seems more smooth. less surging, clean power and then more power woohoo. Did i mention the noise? its music i tel yer. I suspect the old pipes being unequal in their flow resistance wernt helping anything.

Question - Is it normal to get a slight hint of yellowing on the downpipes on polished stainless pipes? Or am i getting it too hot?

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Re: Fitted H2 UFO's ?

Postby Wolfie » Mon Oct 08, 2018 9:50 pm

They do darken just so slightly, but a good dose of Solvol will bring them back for a while..
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Re: Fitted H2 UFO's ?

Postby Windy » Tue Oct 09, 2018 11:53 am

Thanks Graham. So long as the colour doesn't suggest too much heat > seizure!
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