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Post by rigga on May 6, 2023 21:48:45 GMT 1
Those who have the alloy bling fuel caps from Norbo ....
How do you prevent fuel leaking out on to the tank ?
I've had two caps, on two tanks, and both leak fuel whilst riding if the tank is anywhere near full. I've added a extra cork seal along with the main rubber one, which stops the leak, but that then causes fuel starvation issues when riding as intended, as the rudimentary breather is blocked.
Ruined one cap trying to drill a breather hole down the center to alleviate the above issue, don't want to do the same to this new cap, so does anyone else have this issue, and if so, how did you stop it.
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Post by headcoats on May 6, 2023 22:27:19 GMT 1
Is this for an LC ? I have had genuine fuel caps leak and reverted back to a cheapo copy replacement I had bought previously.
No idea why 🧐
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Post by rigga on May 6, 2023 22:43:14 GMT 1
Yes LC, and these caps.
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Post by JonW on May 7, 2023 0:24:48 GMT 1
Are you using a new seal? There was a thicker Suzuki item that some found was better than an used Yam one as it sealed better.
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Post by rigga on May 7, 2023 7:12:08 GMT 1
Yes new seal, off a pattern normal cap, and tried a genuine cap seal, both looked identical .
Be interested if there's an alternative seal that can be used.
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Post by dusty350 on May 7, 2023 7:30:46 GMT 1
If you do get a good seal, you may well suffer fuel starvation as you have already found. The vent channel machined into the underside of the cap is blocked by the seal, so a good seal causes a flow issue. I too ruined a billet cap, snapping off a 3mm drill bit drilling through the centre to aid venting . Dusty
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Post by rigga on May 7, 2023 7:36:59 GMT 1
I screwed the last silver version I had by drilling a hole down the center, my bling addiction caused me to buy another, even though I knew there's an issue with venting.
The seal must be blocking the vent groove if it seals the tank enough to stop fuel passing out of the cap, but then starvation issues occur, must be a way of using this style of cap without resorting to drilling a hole through it.
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Post by dusty350 on May 7, 2023 8:12:55 GMT 1
I know of no other way unfortunately. My second cap drilling was fine, after the first mishap, and as long as you dont brim the tank with fuel, fuel wont exit the drilled hole. It's a poor design regards the standard vent groove - the rubber seal effectively seals the vent ! Short of fitting a separate vent to the tank, the cap has to be modded to be able to let air in.
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Post by dusty350 on May 7, 2023 8:14:20 GMT 1
And to add, I drilled mine on a pillar drill - far from easy. If you could put the cap in a lathe, it would be a lot easier I think Dusty
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Post by rigga on May 7, 2023 8:24:13 GMT 1
Yea my shonky pillar drill wasn't the ideal choice, and sod that trying a hand drill, need to find a man with a lathe.
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Post by 4l04ever on May 7, 2023 10:31:23 GMT 1
tezrhc on here has drilled his cap and fitted a vent pipe. You could maybe fit a one way non-return valve in the breather pipe?
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Post by veg on May 8, 2023 10:05:29 GMT 1
Is it possible to open the hole up from underneath using a bigger drill not all the way through but as long as the seal doesn’t completely cover the hole? It could then bypass the seal into the original air vent?
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Post by rigga on May 8, 2023 10:20:39 GMT 1
It's like a slot cut into the underside of the cap ,but the seal sits on top of this slot ,so if compressed too much,in order to stop the fuel passing the seal and leaking out of the tank, the vent is then blocked . It's a poor design
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Post by veg on May 8, 2023 10:29:40 GMT 1
So that’s a no then 😁. Can you separate the two parts? Guessing not. I love the look of them but never had one don’t think I will now. Real shame. Robs suggestion seems about the only way to do it, have a central hole with a vent pipe. Or could you drill into the central part into vent channel?
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Post by rigga on May 8, 2023 10:32:17 GMT 1
Single billet item, so no separation.
Yep hole down the center as a breather is the way forward.
Off to see a man with a lathe later .
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Post by veg on May 8, 2023 10:36:05 GMT 1
If you do that then you could use an oil line spigot ( Norbo sells them) tap a thread at the top fuel line out. I may still be convinced 👍
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Post by stusco on May 8, 2023 11:01:10 GMT 1
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Post by midlifecrisisrd on May 8, 2023 11:07:37 GMT 1
I would be filling the groove with epoxy then do some drillings to make a new vent circuit
My first thoughts are to drill a 5mm hole through the middle but stop 5mm from the face of the cap
Then drill the last 5mm from the top carefully with a 1.5mm drill
The small top hole should stop water getting in
Then drill a 6mm hole across the lower inner lobe crossing your first 5mm hole about 10mm up from the bottom
Then tap the lower bit of the first hole to m5 and epoxy in a grub screw
That way there is not a direct route for the fuel to pass through as it can flush across the lower hole as it sloshes around
Steve
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Post by Tobyjugs on May 8, 2023 12:08:27 GMT 1
I would be filling the groove with epoxy then do some drillings to make a new vent circuit My first thoughts are to drill a 5mm hole through the middle but stop 5mm from the face of the cap Then drill the last 5mm from the top carefully with a 1.5mm drill The small top hole should stop water getting in Then drill a 6mm hole across the lower inner lobe crossing your first 5mm hole about 10mm up from the bottom Then tap the lower bit of the first hole to m5 and epoxy in a grub screw That way there is not a direct route for the fuel to pass through as it can flush across the lower hole as it sloshes around Steve I was thinking something similar but i was thinking drilling in from the side of the top flange to intercept the hole in the middle. Instead of pricking a small hole in the top of the cap so it still is a bit hidden.
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Post by rigga on May 8, 2023 12:09:05 GMT 1
If you do that then you could use an oil line spigot ( Norbo sells them) tap a thread at the top fuel line out. I may still be convinced 👍 Off to see a man who did this to his
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Post by Tobyjugs on May 8, 2023 12:10:11 GMT 1
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Post by veg on May 8, 2023 12:31:01 GMT 1
I really like that.
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Post by stusco on May 8, 2023 12:45:42 GMT 1
There are hundreds on ebay thats just an example
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Post by midlifecrisisrd on May 8, 2023 12:47:50 GMT 1
Rigga's solution looks neat When I do the TR tank I'm going to get a boss welded on the top front of the tank for one of these www.ebay.co.uk/itm/272658735178Steve
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Post by Tobyjugs on May 8, 2023 13:07:33 GMT 1
On a bike with road racer styling it looks good but the tube sticking straight out the middle of the cap plus a sit up position and highish bars just screams motocross to me.
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Post by midlifecrisisrd on May 8, 2023 13:28:52 GMT 1
Also toying with the idea of welding in an oil tank 🤔
You see the old race bikes with a raised section at the front with a vent in it, could partially submerge a 1L oil tank in in disguise
Steve
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Post by JonW on May 8, 2023 13:47:39 GMT 1
I have one on my XT500 supermoto, its ok on that bike as its kind of 'expected'. I dont like the idea of the hole in the middle of a road bike's cap. The hole drilled to the side is my fave of the options so far. I'll need to 'adjust' mine im sure.
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Post by JonW on May 8, 2023 13:50:19 GMT 1
The original has a ball bearing and a bit of felt, I guess the pressure lifts the ball up and vents but ive not investigated how it exactly works.
There is lots of meat in these billet units to engineer something akin to that in the middle.
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Post by Tobyjugs on May 8, 2023 14:13:14 GMT 1
Also toying with the idea of welding in an oil tank 🤔 You see the old race bikes with a raised section at the front with a vent in it, could partially submerge a 1L oil tank in in disguise Steve I guess your not planning on riding it too far? My 443 engine is mildly tuned and is thirsty. Your beastie is going to make mine look like a tea totaler!!!
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Post by stusco on May 8, 2023 14:17:29 GMT 1
Rigga's solution looks neat When I do the TR tank I'm going to get a boss welded on the top front of the tank for one of these www.ebay.co.uk/itm/272658735178Steve The gamma has one of those
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