VHB 30 Light Slide Springs |
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Glawster
Senior Member Joined: 14 Sep 2015 Location: Cheltenham Status: Offline Points: 896 |
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Robert's PH springs were measured to be much longer. Think I'll buy a new pair of standard springs and then try removing a coil from the old ones and see if there's an improvement. I don't fancy chopping them without having a Plan B...
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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If the PH springs are longer, get the lightest PH springs and cut them down. The springs aren't expensive from Dellorto in Reading, so at worst you lose a few ££. It's the diameter which matters.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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Glawster
Senior Member Joined: 14 Sep 2015 Location: Cheltenham Status: Offline Points: 896 |
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Good point Brian. I needed a few other bits and bobs from Eurocarb so I added these springs and I'll experiment a bit with load/compression before I cut them.
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saultrader
Senior Member Joined: 12 Dec 2014 Location: Gloucesterhire Status: Offline Points: 267 |
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Derek, for what it's worth, the previous owner of my G5 bought all his parts from either Corsa Italiana or Motomecca, it might be worth trying them before you start spring snipping? Oh, and I might chose Lydbury North over Tadmarton on Sunday, only because it's a nicer venue, see you there?
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Jerry atric
Senior Member Joined: 24 Nov 2014 Location: Wiltshire Status: Offline Points: 3367 |
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Glawster
Senior Member Joined: 14 Sep 2015 Location: Cheltenham Status: Offline Points: 896 |
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Just to conclude this topic..
I got a pair of PHF lightweight springs from Eurocarb this morning. Of course they are much longer but also the winding is quite different to the VHB springs. In order to evaluate the compression resistance I put each one on a digital scale and measure the load to reduce the length to around 15mm (the compressed spring length on full throttle). The VHB spring required 3,000gm, but a similar length of the PFH spring needed 1,700 gm. I decided to cut the PHF spring to the same length as the VHB spring (68mm) and made the bent spigot to fit the hole in the slide. The result is dramatically lighter - more like my GS BMW which has fly by wire! I was thinking that the slides might not return correctly, but they do seem OK. I do need new throttle cables as one has a couple of frayed wires and they both have various kinks and sets in them. The throttle is now so light though that I would recommend anyone else making this mod to either get the standard PHF spring (mine were the light option) or try cutting them at around 90mm long first. Anyway I can now dispense with the rubber bands on the twistgrip which I needed before to stop the bloody thing gradually closing! |
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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Well we now know that the PHB springs will fir the earlier carb. Pleased you got the result you wanted.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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Mike H
Senior Member Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 8733 |
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Oh yes you've reminded me I've done the rubber bands thing! Later substituted with much more grippier grips ~ another option to consider ~ had to do this on the R80 I've just remembered, cos the stock grips were slippy plasticky type...
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"Chicken nuggets don't dance on a Tuesday."
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cyclobutch
Senior Member Joined: 08 Sep 2015 Location: Essex Branch Status: Offline Points: 750 |
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I use that self amalgamating plumbers tape. Glues itself to your gloves if you run the heated grips hot enough too. |
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Butch
V50 II - 'The Black Pearl' T3 - 'Blue' Eldo Loop - 'Jug' |
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Normski
Senior Member Joined: 28 Jan 2015 Location: Devon Status: Offline Points: 110 |
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I've been running lighter springs for a long time now, first Dellorto ones then some I had made when the Dellorto one became unavailable, using softer springs totally transforms the riding and provided that the cables are well maintained I've had no problems in 50000 or so miles ridden with light springs. I do think that fuel consumption may suffer a tad because it is so much easier to give her an 'andful 😋
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RussT
Guzzino Joined: 20 Sep 2016 Location: lONDON Status: Offline Points: 2 |
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VHB Springs
Hi all new to the forum . I have a 1979 convert . All going well until started to exhibit signs of what I took to be fuel starvation . So decided to strip and clean the carbs . When I dismantled the carbs it all went a bit jack in the box . I assume the the throttle cable runs through the centre of the spring into the slide . The spring is off set . The photos in the Haynes manual are a bit unclear . Can anyone help? . thanks
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v7john
Senior Member Joined: 14 May 2014 Location: West Wales, UK. Status: Offline Points: 703 |
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No the cable doesn't go through the spring. One end of the cable has a piece at the end which slides into a slot in the carb top. It might be a bit loose but it doesn't matter. The cable goes in the hole in the top of the slide and the other end of the spring on top and holds the cable over so it can't pop out. I fit the cable and the spring to the carb top then bend the spring to fit the slide. You can then just stuff it back in the carb and all should be good. When you screw the top back on, position the top and hold it down before doing up the screws. Don't let the spring push the top up at an angle as it is possible to damage the carb top that way.
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1972 V7Sport "The Racing Rhino".
1972 V7 700cc "The Fire Bike". 1954? Superalce 1954 BSA M33 (to be sold) Read my blog https://racingrhino.wordpress.com/ |
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RussT
Guzzino Joined: 20 Sep 2016 Location: lONDON Status: Offline Points: 2 |
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Thanks for the quick reply John . Very clear photo hope you didn't go out and dismantle the carb just to reply to me
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v7john
Senior Member Joined: 14 May 2014 Location: West Wales, UK. Status: Offline Points: 703 |
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Nothing so drastic! I had to rebuild the carbs on my old V7 just the other week. The carbs are similar and I had made a post on my blog.
https://racingrhino.wordpress.com/2016/09/07/carburettor-refitting-and-tuning-7-sep-16/ |
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1972 V7Sport "The Racing Rhino".
1972 V7 700cc "The Fire Bike". 1954? Superalce 1954 BSA M33 (to be sold) Read my blog https://racingrhino.wordpress.com/ |
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jmee54
Senior Member Joined: 28 Nov 2014 Location: Cornwall Status: Offline Points: 1469 |
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Your bike is so clean. It puts mine to shame.
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