Still struggling with this stall while cruising... XTRs POS

NutsyUk · Nearly there... Joined: 22 Jun 2016 Karma :

Right, Sadly this problem with my Lexmoto XTRS hasnt gone away and im still none the wiser to whats causing it.

The details are... The bike runs fine in town, at town speeds and revs....

But when I go out on the A roads and try to cruise at 50-60 (on the clock) at around 7-8k RPM after a little while I start to feel the bike stutter... Like im hitting bumps in the road... It gets worse and then I loose all power.

Its a bit like running out of fuel. but I have a full tank.

Sometimes i can drop it to 4th gear and lower the revs (if no traffic behind me) and it might recover... but most of the time any attempt to lower throttle kills the engine completely. If I dont do anything it kills the engine completely...

The inside of the tank looks clean, I dont have a fuel filter on the pipe so cant check that.

The air filter on my carb is clean. The carb looks clean. The jet still squirts. Tappets were loosened last time to try and fix this... Didnt fix it and now they seem too loose. I need to tighten them up a little....

And the spark plug is a healthy brown grey... Not too black and not oily...

Because of my current situation i cant just strip the bike right down... But I do want some ideas to what it could be.

Also As Im broke I cant afford to take it into a shop and have it looked at and serviced right now...

But if I have an idea of what to fix I could take quickly take it apart focusing on one area and then put it back together in a day...

Of course I emailed Lexmoto they wouldnt even bother to suggest whats wrong... (i know whats wrong... its a lexmoto............... D: )

What is odd... Sometimes though very rare. The bike behaves and I get a good ride on the A roads. But its rare.

I do want a better bike, but right now its not possible... I was saving my my direct access before my upheaval a few months ago... I would be riding a bigger bike by now if it hadnt happened. But for the time being im stuck with this piece of shit crap bike so I need to try and fix it.
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Yamaha FZ8/Fazer800 (split headlight one) 2014, ~~gingerly getting used to the massive increase in HP and not killing myself in the process!~~ That was easy to get used to.
Kawasaki ER6F 2007 650 Gonna sell as a project bike!
~~Lexmoto XTR S 125~~ Sold!

Moo. · World Chat Champion Joined: 11 Jan 2009 Karma :

Problem with fuelling? Have the carb jets been messed with at all or changed?

Might be worth taking the carb off and giving it a clean to make sure nothing's blocked (assuming it's not Fuel injected...)
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A2 Passed 18/6/10

........ · Borekit Bruiser Joined: 01 May 2017 Karma :

It would be worth checking your tank breather. As the symptoms occur after an extended period under high load it's possible that a partially blocked breather could be causing a vacuum in your fuel tank. Next time this happens if you stop and quickly open the filler cap a sudden inrush of air would prove this.

NutsyUk · Nearly there... Joined: 22 Jun 2016 Karma :

NutsyUk · Nearly there... Joined: 22 Jun 2016 Karma :

doggone · World Chat Champion Joined: 20 May 2004 Karma :

Before doing anything drastic try a new spark plug, note you need to be sure what you get is suitable because it can be a minefield and possibly damage engine using one laid about from something else.

When there's only one spark plug it goes through hell - and a spare is good to have even if that isn't what's wrong now.

Would agree the vacuuming is a strong contender.

........ · Borekit Bruiser Joined: 01 May 2017 Karma :

Chris45 · Nitrous Nuisance Joined: 23 Oct 2016 Karma :

NutsyUk · Nearly there... Joined: 22 Jun 2016 Karma :

There is a vac pipe that goes to nowhere... so i assume thats the vac pipe :p Ill check to see if tis kinked or blocked...
____________________
Yamaha FZ8/Fazer800 (split headlight one) 2014, ~~gingerly getting used to the massive increase in HP and not killing myself in the process!~~ That was easy to get used to.
Kawasaki ER6F 2007 650 Gonna sell as a project bike!
~~Lexmoto XTR S 125~~ Sold!

Chris45 · Nitrous Nuisance Joined: 23 Oct 2016 Karma :

Robby · Dirty Old Man Joined: 16 May 2002 Karma :

Running out of electricity feels just like running out of fuel, and normal diode reg/recs tend to fail in such a way that they start off by working fairly normally at tickover, but not working at high revs.

Multimeter on the battery with the engine running. You're looking for 12.5-13.5v at tickover, and more like 14v at 4000rpm. If the voltage at high rpm is lower than the voltage at tickover, your reg/rec is on the way out.

NutsyUk · Nearly there... Joined: 22 Jun 2016 Karma :

I dont think its the regulator, not that I dont think the reg is on its way out... Just when im up in the higher revs the needle is throwing out to 15+v......

Once I got a case design done for my speedo project I could ride with my speedo... and that would be more accurate.

Checking with multi meter isnt possible right now.

Annoyingly. Checking the vac pipe is awkward. Because the only way to get to it is to lift the tank off the bike.

Im biking home sunday next week. ill have a go at it then. In the mean time ill take another look to see if i can reach the pipe and make sure its ok... Ill redo my tappets again as well while I have the tank off...

Thanks to everyone for the help. I know tis all a long shot but its got to be worth the try. I never expected a race bike when i got this, But I wanted it to at least work safely Smile

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Yamaha FZ8/Fazer800 (split headlight one) 2014, ~~gingerly getting used to the massive increase in HP and not killing myself in the process!~~ That was easy to get used to.
Kawasaki ER6F 2007 650 Gonna sell as a project bike!
~~Lexmoto XTR S 125~~ Sold!