I modded a VTX1300 adapter for a Spike intake. The VTX1300 and our bikes do not share the same adapter mounting, but they share similarities.
You can ref my link below to show you what I had to do to Mod the spike intake meant for the VTX 1300
The intake 'choke' blades need access to an intake manifold vacuum port if you want them to pull closed at idle and open with twisting the throttle. Otherwise, they will remain open all the time. Only California emissions Furys have this port which is connected to the charcoal canister and could be 'T'-ed to the Hypercharger. No worries, it's just cosmetic and doesn't affect intake air.
If you have the inclination and the skills you could add a vacuum nipple to a non CA bike ...
Resting in your garage, engine OFF: normally open with no vacuum. Resting at a stop light, engine ON: normally closed at idle. :beatup:
Vacuum pulls the diaphragm and butterflies closed .
Ken, if the video in the 4th post doesn't show up on your phone just Google Fury Forums. Seems there is now a mobile version on Chrome or Internet and it works better than Motorcycle.com for me. :toast:
I would get a fuel shutoff valve for a lawn mower and put it inline on the vacuum line and dial it in to your liking... Its basically a 1/4 turn ball valve so just a little turn would restrict the vacuum and cause it to open further.
I was kinda thinking the same thing but figured for the cost of the shut off valve it wouldn't hurt to try it... My thought is the vacuum is too strong and not allowing the plates to open all the way so something to reduce the pressure/suction... In my theory a larger diameter hose would make it worse due to the larger area so a smaller diameter hose "should" reduce the area allowing it to open fully OR perhaps I am on the wrong trail like this:
Alternatively a stronger spring in the diaphragm would also fix the problem... Although that is probably easier said than done.
Ken, I don't think f1 has ridden it yet to get a decent load and just revving it in neutral won't produce enough vacuum.
EDIT: should read ... will still produce TOO MUCH VACUUM to open the butterflies fully.
Now I'm terribly confused... If it is FULLY OPEN with the bike off/NO VACUUM. And the butterflies CLOSE at IDLE/HIGH VACUUM.... And cracking the throttle/revving the engine opens the butterflies/ lowers the vacuum on the air cleaner... Then why would he need MORE vacuum being that his complaint was that they don't open enough???:confuzed:
Perhaps I should leave well enough alone... My head is starting to hurt... Lol
Terribly sorry 'bout that Ken. I'd like to say I was messing with you but truth be told it was a senior moment. TOO MUCH VACUUM REVVING IN NEUTRAL. SORRY.
Yeah, sorry I was off on a binge. Yeah I have that hypercharger. Very easy to install using the Thunder mfg. adapter. I drew my vacuum from the intake manifold between the cylinders. Works perfect full open when bike is not running, the flutter nicely at idle and move accordingly. I have some pictures and videos and can take more, but it would be easiest if you are on the FaceBook Fury Nation page or with an email address as I can`t seem to get pictures let alone videos to post on here.
PM me if you need or look me up on the FaceBook page.
Seems I have a little more action than that. I drilled a 5/16 hole in the intake manifold behind the intake butterfly, right between the cylinders, and tapped it and screwed a nipple in it and worked just fine. It`s a real tight spot, there`s not much room behind the intake`s main butterfly, but it fits.
Thanks Gar for checking my failed link, lol. Jus caint figure dis stuffs out.>
Yeah that`s about where I put mine. And I used the nipple supplied from Thunder MFG. but I used my own hose. Might be metric even, it was just what I had. It`s a very tight fit on the hyperchargers vacuum nipple. When I have had to take it off, I always take the hose off the throttle body because it`s easier to get back on.
Last ditch effort, I have more hose...I can send ya some fr the postage cost.
The adapter was for a vtx and I had to do some grinding and plugging holes but got it to work, I had to just buy a hose fitting at the hardware store. So all in all it does work with a little backwoods engineering.
Check my first post and see how the adapter wasn't really a circle for the rubber from the throttle body. it is now. I'm gonna try a 1/8 fitting and see if that makes a difference.