2011 CBR250R - Fueling Issues? - Page 3 - Honda CBR250R Forum : Honda CBR 250 Forums
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post #21 of 52 Old 07-28-2017, 10:13 PM
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Quote:
Originally Posted by Subaruzi View Post
Update:

Bought eBay tank (super clean inside, doesn't look used but it is dented) and a filter. Old tank really nasty inside. Rust chips, random small debris and coated with that blue/silver tank liner. Swapped everything over, put a gallon of premium in and cranked....

Nothing. Bike turned over but didn't start.

Could injector be clogged?
Your original fuel pump could be the problem.

There may be a plugged filter on the pump or the pump itself may be damaged due to the debris in the tank.

Don't run Premium unless you have to. Only reason to use Premium would be because it doesn't contain ethanol.
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post #22 of 52 Old 07-28-2017, 10:40 PM Thread Starter
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Just checked injector and that worked fine.

Any way to check or clean the fuel pump?

Also, other than cost is there reason not to run premium? I run in all bikes out of overabundance of caution

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post #23 of 52 Old 07-28-2017, 10:55 PM
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The bike is designed to run on regular gas. Higher octane gasoline is harder to ignite and has no more power. You may actually build up carbon deposits faster because of a less through burn with higher octane fuel.
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post #24 of 52 Old 07-28-2017, 11:01 PM Thread Starter
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Well shoot, I'll go with lower octane in future.

Would it make sense to pull injector, attach to tank and try to start to see if fuel is spraying out of injector? I'm aware of fire hazard.



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post #25 of 52 Old 07-29-2017, 10:09 AM
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Quote:
Originally Posted by Subaruzi View Post
Well shoot, I'll go with lower octane in future.

Would it make sense to pull injector, attach to tank and try to start to see if fuel is spraying out of injector? I'm aware of fire hazard.
I wouldn't do that.

I would run a test on the fuel pump, and figure out if there is a filter in it somewhere. You should be able to disconnect the fuel line and get a good amount of fuel to flow from the line with the ignition on. See if you can find a service manual for the exact procedure and amount per min.

The fuel pump and filter would have a better chance of causing the problem than the injector, due to the rust in the tank.
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post #26 of 52 Old 07-29-2017, 09:06 PM
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high octane might be diagnostic or precautionary if
experiencing engine 'knock' 'pinging' or pre-ignition..
unlikely for this engine,, but one possible reason for
using slow burning fuel [ie, high octane rated]..

our combustion chamber conditions are designed for
faster burning fuel, ie; lower octane rated petrol/gasoline..

ethanol is blended here [aust] with 'regular' [91ron/87pon]
thus motorists rejecting ethanol are forced to pay for 'premium'
[95/98ron] to avoid ethanol in their engines..
aside from older [carb etc] vehicles this also includes
many other motorists, according to the nrma..
ive used 95/98 in emergencies to avoid ethanol in 91ron

thing is, you just dont know how much ethanol is actually
in fuel labelled as '10%'.. could be less, or more..
storage tanks can leak or otherwise allow water in,
relying on mixing when tanks filled/topped up
thus in static stored petrol phase separation results in
dropping of ethanol/ethanol-petrol/water layers down
to bottom of storage tanks, which may be pumped out
into unsuspecting driver/rider tanks..

so it could be the luck of the draw what you actually get
as '10%' ethanol, and from storage tank conditions/turnover..

recommend using reputable outlets with good turnover
and zero ethanol added to any petrol stored/sold..
otherwise perhaps 95ron as ethanol 'free' emergency..
usa also has 'rec-90' pure petrol for marine, aircraft,
and other small engines..

[link = first hit google search; 'ethanol over 10% stalling']
List: E10 Engine Damage & Performance Issues.
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post #27 of 52 Old 07-30-2017, 07:15 AM Thread Starter
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I use high octane in all my other bikes so it was just easier. I didn't realize the compression of the CBR is so low that it could cause damage by using it.

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post #28 of 52 Old 07-30-2017, 07:20 AM Thread Starter
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@jkv357 - I didn't heed your advice and tested fueling by pulling injector and hooking everything back up.

The injector had small and inconsistent amounts of fuel coming out. Wasn't a nice fine mist either like when I tested injector by itself. This leads me to what was said earlier about fuel pump behind clogged.

Better to buy new one or clean this one? I can't find much info on cleaning fuel pump.



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post #29 of 52 Old 07-30-2017, 10:56 AM
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Get a new filter for the new fuel pump. You might want to first change just the filter and see if that was sufficient to fix the problem. Then you could return the new fuel pump if only the filter was the problem.

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post #30 of 52 Old 07-30-2017, 11:19 AM
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A question that I didn't see asked in this thread, is whether the fuel pump goes through its pre-start cycle when the ignition key is first turned to the 'on' position?

Former Factory Test Rider/Technician
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