Help CBR250RR MC22 Dies after a 20 minute ride.

You'll have to start narrowing it down to either fuel or spark.
Get to the plugs & check there's good spark
Then next thing is try the fuel line off the carbies for fuel flow first, it could be a blocked filter.
More than likely its a fuel issue that a simple clean up will fix.

 

If the bike has been sitting for a period my guess is some blockage within the carbs. Of course I could be wrong but fuel left in carbs turns to muck and causes untold trouble. A good clean with Threebond should clean things up nicely, keep us posted.

 

MC22's are known to have issues with the voltage regulators, do you have access to a multi meter ? You can pop your side cover off and check the regulator doing a simple diode test ( google voltage reg check, there are plenty of youtube vids out there) , the other simple check is to pull the seat off and check the voltage to your battery. Could be fuel related, eg filters blocked etc, one thing you can try is when it stops running, open your tank cap and try and start it, could be vacuum \ petcock related.

 

sounds hard to isolate, but what I would want to know is if its lack of spark or a fuel issue.
Might be worth running it up to temperature then when it happens quickly check for a spark?
Way to many possibilities at this point to isolate.

 

Buy a multi meter from Jaycar, set it to voltage (dc) and measure battery voltage in the following conditions:

Ignition on, engine off
Engine on, idling
Engine on, 4,000 RPM
As above with lights on

You also need to measure the voltage when cranking the engine over. A healthy battery should not drop below 12v when cranking.

Also note that battery voltage should never read over 14.4v, if it does, the electrical system is feeding too much voltage to the battery and will fry it. The cause of this is a faulty R/R

Also have the valve clearances been measured or set?

 

sorry i missed this. exactly my thoughts do that!
my money is on a spark plug is fouled. but if not then yeah check for spark.

 

how did you check it ? Did you set your meter to diode ?





Check that each phase of your stator , ie check the yellow wires are not going to ground by setting your meter to continuity .. ( beep test), place one end in each the yellow wires coming from your stator and the other to your frame or engine, also check that the meter does beep if you check from phase 1 - phase 2 and phase 2 to phase 3 and phase 3 to phase 1.



Check the voltage across your battery at idle, when the key is turned on and and when its running and revved up to about 4000 RPM, should read over 14v

 

Sounds like fuel starvation to me, check all filters. Did it need choke when you first got it started again? What speed zone were you in? Something could be slowing fuel flow down and when it needs fuel. Say cruising speed of 9000rpm continuously it may not be supplying fuel fast enough.

 

Guys is the mc22 a vacuum or gravity fuel tap?? @kiffsta @Mclaren @Damus @Phil could it be as simple as vacuum line not connected to tap?

 

Yes its vacuum and yes that could be the problem *nods*.

Where are you located ghost?

 

Could but my mine has vacuum line removed runs on gravity dunno y it dun like that but it runs mint

It is meant to be vacuum I should of said aswell

I have had this problem in past with dirt bikes was bits of crap blocking jets then settling and was moving again blocking jets I'd pull them off and check cost nothing and easy to do plus it been sitting

 

It's funny you say that. I think technically it is gravity fed fuel but there seems to be a valve that only allows fuel to pump out the petcock when there is enough suction on the vacuum line. I don't think the vacuum itself helps it feed it petrol as such, just allows it to flow. Safety feature perhaps? *shrugs*

 

have you checked the vent opening in petrol cap,if blocked (wasp dirt etc ) can cause this problem

 

Isn't the reserve position on the petcock gravity fed (no vacuum)?

 

cool , another Brisbane rider !!!

 

Intermittent problems are hard to diagnose. But if you're logical and think about it you may start narrowing it down.. for example it's got spark, you've tested reg/rec, stator battery and all is good - I am doubtful it will be electrical. Conductivity generally increases when components are warm. Unless you've got a short somewhere, that would be harder to find so I'd rule out fuel first before you start chasing ghosts

Sounds to me like it starts and rides, so it's got fuel at first. When you stopped it wouldn't start again - if it's got spark it means it's not getting fuel. That could be a jet blockage or it could be a fuel supply issue. I'd be looking at your fuel tap, I'm not overly familiar with the CBR's but if it is vacuum fed you shouldn't be riding in PRI mode (which is the only way it will work by gravity). If it works when you're "ON" you've probably got a problem with your diaphragm or something in the tap itself because it simply shouldn't supply fuel without the vacuum line on. So as has been said, that's a good thing to confirm...

Good luck.