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Old 06-15-2017, 07:33 PM   #2011
2strokeYardSale
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Got my Tubliss bladder problem figured out and re-mounted the Dunlop 803GP. Now the bead won't seat and the tire won't hold air.

Air is leaking around the high-pressure valve and through spokes. WTF?
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Old 06-15-2017, 07:44 PM   #2012
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Would a tube be better? Soft suspension, slower speeds mean less chance of pinch flats?
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Old 06-15-2017, 07:54 PM   #2013
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Tubes are very last decade

Sounds like a nicked liner. Possibly not enough lube? If the inner liner is being pushed hard enough to contact the inside of the tire bead, it's just a matter of everything moving as the tire sets the bead. What is the inner tube inflated to? And how much pressure are you using to inflate the "low" pressure valve?

*Edit - When I installed a Pirelli MT43 on an 18" rim, I spent the most time cleaning the center of the rim. Then spent a decent period of time lining with their rim tape. For soap, I mixed car wash soap and made sure it covered everything. Still took a little bit of pressure to get the tire to inflate, but it worked.

Last edited by James; 06-15-2017 at 07:57 PM.. Reason: Adding experience notes.
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Old 06-15-2017, 07:56 PM   #2014
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What Eric B said... seems like a HD tube might be a whole lot easier to deal with.

BTW, I thought all new trials bikes came with tubeless rear rims?
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Old 06-15-2017, 09:06 PM   #2015
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What Eric B said... seems like a HD tube might be a whole lot easier to deal with.

BTW, I thought all new trials bikes came with tubeless rear rims?
The Contact model comes with a tube type rear rim. Part of the deal with the lower price.
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Old 06-15-2017, 09:26 PM   #2016
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I took the tire off, took the Tubliss off, cleaned up the rim and added rim tape where some spoke ends had poked through, inspected the bladder (with air and soapy water), inspected the liner, and re-installed with silicone spray. No dice. Then I did the "reset" with soapy water. No dice. Bladder was at 90+psi last check.
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Old 06-16-2017, 11:22 AM   #2017
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After several calls to Jeff at Nuetech, I got the Dunlop 803GP seated and aired up with the Tubliss. The problem is tubless tires (i.e., trials tires) don't want to seat the bead and there's a special technique. Air up the bladder only partially then blast the tire like it's a street tire (which it is more or less) until the beads pop on. Then air up the bladder fully and reset the tire pressure lower.
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Old 06-16-2017, 01:22 PM   #2018
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Originally Posted by 2strokeYardSale View Post
After several calls to Jeff at Nuetech, I got the Dunlop 803GP seated and aired up with the Tubliss. The problem is tubless tires (i.e., trials tires) don't want to seat the bead and there's a special technique. Air up the bladder only partially then blast the tire like it's a street tire (which it is more or less) until the beads pop on. Then air up the bladder fully and reset the tire pressure lower.
Interesting, good to know.
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Old 06-16-2017, 05:48 PM   #2019
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Did a compression test on the trials bike at just under 4 hrs (they say 8 for break in) and got only 115 psi. I expect trials bikes to have less compression but that's a lot less than my YZ250 which is always around 200.

Installed some folding levers from RYP/ARC, using only one of the stock bushings per lever, because both bushings is too tight and doesn't let the lever return. A single bushing is still not ideal and leads to a little floppiness.

Rejetted to a fatter pilot and leaner main. Drained the tank and found reserve is less than a tea cup. Added 80:1 premix instead of 50:1. Adjusted the fuel screw and adjusted the clutch riding it around my driveway.
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Old 06-16-2017, 06:28 PM   #2020
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That does seem low. Did your spark arrestor show up?
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Old 06-16-2017, 08:06 PM   #2021
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No spark arrestor.
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Old 06-16-2017, 08:08 PM   #2022
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Well thats a bummer. Might still be worth coming out to see what the deal is. I learned alot the time I checked a section instead of riding. If you make it out I'll be in the subaru brat.
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Old 06-17-2017, 06:06 PM   #2023
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Finally washed the DRZ after the last stonybarf so I can do a little maintenance for the Barf baja trip.
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Old 06-19-2017, 03:50 PM   #2024
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Finally washed the DRZ after the last stonybarf so I can do a little maintenance for the Barf baja trip.


Did you get the CRF rebuilt yet?
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Old 06-19-2017, 05:18 PM   #2025
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Did you get the CRF rebuilt yet?
Life got in the way. Dropping it off at Engines Only on Thursday.
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