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VHB 30 Light Slide Springs

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Glawster View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Glawster Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jun 2016 at 09:11
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jun 2016 at 10:27
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.
Brian.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Glawster Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jun 2016 at 11:52
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote saultrader Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jun 2016 at 13:55
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jerry atric Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jun 2016 at 21:25
Originally posted by BondEquipe BondEquipe wrote:

Originally posted by Jerry atric Jerry atric wrote:

This is all bad news for me as I find my throttle too heavy. Funny, it wasn't in 1979, I must have been doing something that strengthened my right wrist I've been meaning to get some lighter springs thinking that they were readily available.


Worth a check on the cable routing - I do recall getting confused with what went where under the tank!  I think the optimum is supposed to be a neat crossover under the frame rail  but I might not have got it right . . 
I did fiddle with the routing. I also fitted the Venhill cables you gave me (kind soul). I can't remember if they are nylon lined can you? Obviously if they are not I'll lube them
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Glawster Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jun 2016 at 18:33
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jun 2016 at 18:39
Well we now know that the PHB springs will fir the earlier carb. Pleased you got the result you wanted.
Brian.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 05 Jun 2016 at 20:59
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote cyclobutch Quote  Post ReplyReply Direct Link To This Post Posted: 06 Jun 2016 at 14:14
Originally posted by Mike H Mike H wrote:

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...

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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Post Options Post Options   Thanks (0) Thanks(0)   Quote Normski Quote  Post ReplyReply Direct Link To This Post Posted: 06 Jun 2016 at 21:22
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote RussT Quote  Post ReplyReply Direct Link To This Post Posted: 20 Sep 2016 at 19:45
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote v7john Quote  Post ReplyReply Direct Link To This Post Posted: 20 Sep 2016 at 20:10
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote RussT Quote  Post ReplyReply Direct Link To This Post Posted: 20 Sep 2016 at 22:08
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote v7john Quote  Post ReplyReply Direct Link To This Post Posted: 20 Sep 2016 at 22:46
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/
1972 V7Sport "The Racing Rhino".
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jmee54 Quote  Post ReplyReply Direct Link To This Post Posted: 21 Sep 2016 at 09:50
Your bike is so clean. It puts mine to shame.
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