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  #1  
Old 3 May 2018
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Honda crf250l cut off when hot
We are currently in Sudan, the petrol is here extremely bad and they have a big shortage. That's why the quality is so bad. Our CRF 250L cannot handle the combination of the heat 46 degrees Celsius and the bad fuel. The tank is getting big and cuts of the engine. We can now only ride between 5 am and 9 am in the morning.

I took out the tank to check everything, it's all clean nothing to see, checked the tubes as well.

Now curious about if any people have the same experience when riding in extreme heat.

I didn't ride with the tank open, but looks like that's the only option for the bike to work properly till we reach Egypt (1200 km from here). Did anyone ride with the tank covered with a old shirt for example? Would that be safe enough?

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Old 3 May 2018
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Yes, sounds like "Vapor Lock". Most standard fuel tank caps have a venting diaphragm device built into the cap. These can sometimes clog or get blocked by dirt or minerals from water. One possible solution is to remove fuel cap, take apart mechanism and punch a hole or two in the rubber diaphragm and put it back together. This may work. It should still work as a vent and hopefully not too much fuel will leak out with bike on her side ... but some may leak out.

Also, sometimes some anti pollution devices can cause Vapor Lock, like the charcoal filter canisters fitted to many modern bikes. If you OVER FILL you tank with fuel ... the run-off will fill and canister and bike may not run. Solution? Remove canister but BE SURE to re-route or plug left over hoses correctly ... or more problems may occur. Usually very simple to do.

Another common problem if fuel is "bad" ... is simply water or Diesel in fuel.
Good in-line filters can help stop ingress of water ... but even a little water will STOP your CRF!

If problem seems HEAT related ... then could be the "pick up coil" or "ignitor" housed in next to Stator. This is a common failure item on many bikes.

Good luck, hope you can sort it out!

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Old 4 May 2018
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right, lose the cork

but better to travel when is cooler anyway
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Old 17 May 2018
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And just a crazy idea: maybe filter the gas through a coffee filter? ;-) Will take som time, but maybe worth the effort! Anybody tried?
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Old 17 May 2018
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Coffee filters are good ... but not sure how much water they will catch?

With water, if in doubt ... drain the tank! Re-Fill with known to be good fuel!

For filtering on the road I use thin mesh nylon stockings. I cut them into pieces, rubber band one piece over fuel tank inlet, and put another nylon piece over fuel hose. NO dirt gets into tank ... but water and Diesel may still get into your tank.

A little Diesel won't hurt but A LOT will.

For water, there are chemical fuel additives that will absorb water and allow it to be burned and run through. A bit of rubbing Alcohol can help but there are other more advanced products like Sea Foam and others. I love Sea Foam and use it preventively every 3rd fill up or so. It not only absorbs water, it also can help dissolve varnish and other crud in fuel.
Not Snake Oil!
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Old 17 May 2018
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Seafoam is indeed the real thing--far superior to other additives. Another option is Mr. Funnel products, at least one of which is small enough to carry on an extended trip. A coffee filter or bit of cloth or nylon is fine for particulates, but won't do anything for water.

I had a rented 250L cut out on me recently--no warning, and no restarting for a couple of minutes until, mysteriously, it started and ran fine for another week. It wasn't particularly hot at the time, and I wasn't working it hard. No fuel tank venting issues, either. I just chalked it up to the local deities deciding I needed a brief humbling.

Hope that's helpful.

Mark
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