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+--- Thread: How to fill handlebars with expandable foam (/showthread.php?tid=67399)
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How to fill handlebars with expandable foam - HarryHornby - 22-02-14
Hi All,
I remember a while back someone one here said about filling the handlebars with expandable foam to try and reduce the 6k rev buzz.....yep, I had it on the old bike and have it on this new bike.
How do I get inside the handlebars?? I've taken the bar weights off and removed the grips but I can't see a way to remove the inner part that the bar ends screw into, without removing this I can't squirt in the foam.
Cheers
Re: How to fill handlebars with expandable foam - tony_d123 - 22-02-14
I can't see how putting foam in would make any difference. Normally you need weight. On my buzzy 2-strokes with traditional handlebars I pump silicone in the ends then push fishing bomb lead weights in.
Re: How to fill handlebars with expandable foam - darrsi - 22-02-14
I can't imagine that making much difference at all.
Heavier bar ends, and maybe even a carb balance would be more useful.
Re: How to fill handlebars with expandable foam - HarryHornby - 22-02-14
Someone said it was an old trick, I can see how the foam would absorb the buzz, would it not...... I thought it was worth a go seeing as I have some foam lying about
Re: How to fill handlebars with expandable foam - Ebme Geek - 22-02-14
High density rubber foam maybe, thinking absorption sheets and the like,
DIY low density expanding foam I doubt it, imo
Re: How to fill handlebars with expandable foam - tony_d123 - 22-02-14
You need some density, you would be better filling them with just silicone than using expanding foam.
Re: How to fill handlebars with expandable foam - Ebme Geek - 22-02-14
Standard silicone would take a long time to cure all the way through, and the ones that smell like vinegar release acetic acid that will corrode the bars from the inside, not a problem where a full cure is achieved quickly but here I would not recommend it, cure rates are often only a couple of mm's per day. Better would be a two part mix compound that cures after mixing
Re: How to fill handlebars with expandable foam - noggythenog - 22-02-14
Other option......get passed 6k as soon as possible
Re: How to fill handlebars with expandable foam - HarryHornby - 22-02-14
(22-02-14, 12:14 PM)noggythenog link Wrote: Other option......get passed 6k as soon as possible
:agree Thanks guys, I shall not bother, given the advice on here.....at least you've saved me a job this morning LOL
Re: How to fill handlebars with expandable foam - darrsi - 22-02-14
What about sand?
Easier to use with less mess.
Re: How to fill handlebars with expandable foam - stevierst - 22-02-14
Fit Renthals. Comfier and less buzzy. Win/Win in my eyes!
Re: How to fill handlebars with expandable foam - tony_d123 - 23-02-14
(22-02-14, 12:12 PM)Ebme Geek link Wrote: Standard silicone would take a long time to cure all the way through, and the ones that smell like vinegar release acetic acid that will corrode the bars from the inside, not a problem where a full cure is achieved quickly but here I would not recommend it, cure rates are often only a couple of mm's per day. Better would be a two part mix compound that cures after mixing
The outside cures quickly so corrosion is not an issue. I have used it in bars for years.
Re: How to fill handlebars with expandable foam - Lumpy - 24-02-14
(23-02-14, 02:39 PM)tony_d123 link Wrote: [quote author=Ebme Geek link=topic=11790.msg129009#msg129009 date=1393067565]
Standard silicone would take a long time to cure all the way through, and the ones that smell like vinegar release acetic acid that will corrode the bars from the inside, not a problem where a full cure is achieved quickly but here I would not recommend it, cure rates are often only a couple of mm's per day. Better would be a two part mix compound that cures after mixing
The outside cures quickly so corrosion is not an issue. I have used it in bars for years.
[/quote]but the outside would be inside, like in the original tube it came in so maybe it would take months to go off?
Filling the bars is all about changing the harmonic point of the bars, whether it be bar end, or filling, or different length bars, or aluminium, all the resonant frequencies will be different and the resonance will just be moved. No amount of carb balancing will stop an engine vibrating :rolleyes . The standard bars are awful anyway and are only fit for the bin, goodness know what shape arms and body they were designed for. Hammering lead into the bars, and even aluminium can have a positive effect too. Every engine is different so there is no magic formula. Most like holding the bars less tight would have the best effect.
Re: How to fill handlebars with expandable foam - darrsi - 24-02-14
You're saying out of sync carbs don't cause vibration?
Yeah, whatever........ :rolleyes :rolleyes :rolleyes
Re: How to fill handlebars with expandable foam - Dead Eye - 24-02-14
No, he's saying that perfectly synced carbs won't remove ALL of the vibration - big difference
Re: How to fill handlebars with expandable foam - darrsi - 24-02-14
(24-02-14, 12:13 PM)Dead Eye link Wrote: No, he's saying that perfectly synced carbs won't remove ALL of the vibration - big differenceThat's not how i read it, that was in reference to my earlier comment!
It's an engine, obviously there'll be some vibration.
Re: How to fill handlebars with expandable foam - Lumpy - 24-02-14
(24-02-14, 11:23 AM)darrsi link Wrote: You're saying out of sync carbs don't cause vibration?you are such a KAFA, the effect is minimal higher up in the revs and as the OP was talking about 6k revs the effect will be minimal in the extreme unless you can explain to us all why not and what effect an out of synch carb set will have on the main circuit?
Yeah, whatever........ :rolleyes :rolleyes :rolleyes
Re: How to fill handlebars with expandable foam - darrsi - 24-02-14
(24-02-14, 02:05 PM)Lumpy link Wrote: [quote author=darrsi link=topic=11790.msg129450#msg129450 date=1393237398]you are such a KAFA, the effect is minimal higher up in the revs and as the OP was talking about 6k revs the effect will be minimal in the extreme unless you can explain to us all why not and what effect an out of synch carb set will have on the main circuit?
You're saying out of sync carbs don't cause vibration?
Yeah, whatever........ :rolleyes :rolleyes :rolleyes
[/quote]
No point in me trying to explain anything to you is there really?
Go and do something useful like clean your bike!
Re: How to fill handlebars with expandable foam - mickvp - 24-02-14
Now now gents, let's keep things civil eh?
No reason why we can't discuss something like grown ups without resorting to name calling really. It's only a motorcycle st the end of the day 8)
Re: How to fill handlebars with expandable foam - Lumpy - 24-02-14
Quote:No point in me trying to explain anything to you is there really?Just as I thought, you couldn't explain it.
Go and do something useful like clean your bike!
I know it is my opinion and it counts for little anyway but out of all the posters on this superb forum, you post the most inaccurate bollocks out of them all. I know you believe it to be true and maybe even think it's right but I really hope no-one takes most of your advice. I don't think you are a bad person or anything just misguided
That bike gets cleaned regularly, at the moment it has been a bout twice a year
but yes it does need a wipe over. Most of the dirt just falls off as the carbs are not balanced and the vibrations do it. It feels like a 600 single without balancers fitted, but when the carbs are done it will be like a silky v12 I expect.I'm not going to get into another battle of wits with an unarmed man so this will be my last, but please feel free to counter argue. :evil