Posts
7
Joined
3/15/2012
Location
GB
Edited Date/Time
7/3/2020 3:19pm
Hi, I'm new to this forum so I don't know weather this is the right place to post this but I need some help diagnosing a starting problem on my bike (CRF 250R 2010)
It seems as if the bike is not getting any fuel but the fuel pump is working, the electrics are fine and my local honda dealer said there has not been any problems with the fuel injection systems at all or not that he's dealt with so far! So I'm unsure what it might be and don't really want to put it in to a shop to get ripped off when I could fix the bike myself if I knew what the problem might be
Any help would be greatly appreciated thanks guys
It seems as if the bike is not getting any fuel but the fuel pump is working, the electrics are fine and my local honda dealer said there has not been any problems with the fuel injection systems at all or not that he's dealt with so far! So I'm unsure what it might be and don't really want to put it in to a shop to get ripped off when I could fix the bike myself if I knew what the problem might be
Any help would be greatly appreciated thanks guys
I have stripped the bike down and come to a decision of my own that it may either be that the injector in the carb is blocked or the electrics going to the injector are not working properly.
How strong is the fuel pump working?
Is the injector spraying clean?
What is your valve clearance?
It's pretty hard to diagnose an electrical problem over the internet, let alone on vague information. My best advice is to get your electrical meter and service manual out and use the troubleshooting section to test everthing. It's a long, tedious process but this is why shops charge alot of money for problems like this.
The injector still needs to be checked im planning on doing that tonight once im home from work as Ive only stripped it down at the moment
The valve clearance was checked by a friend of mine who builds race engines and frames for race bikes and side cars in the isle of man TT and world series superbikes using my manual so I trust that everything is all ok there
I was just wondering if anyone had stumbled across this problem before and could offer me some advice to what their problem was
The Shop
Make sure you don't try putting a 12v power source to the injector to test it if you dont check by kicking the bike. It operates with 5v and you will ruin the injector if you put too much voltage too it.
Did you test compression? Did you do a leak test? 4 strokes need good compression, fuel, air, and timing to run. Check your major things first and work down from those.
When did this issue start? How did the bike act when it first happened? Were you already riding or was it at the beginning of a ride day?
Answering some of those questions may help us help you get your bike starting!
The bike has had a new piston ring and compression test with new valves all at once and this is the first time trying to start it since then.
The problem that first occurred was the bike was slowly getting harder and harder to start and when it was running it got really hot, a shop informed me to check the valves after checking I found out they had stretched.
I havent ran it until its been rebuilt but before the new valves and piston ring it was difficult to start and once it was hot and started it was even harder to start up after it was cut off.
On the cam sprocket you have an arrow that should line up with the flat surface of the head, also you have 2 marks on the stator side visible thru the timing plug, and another mark on the clutch side visible thru another inspection plug. The 2 on the stator side are a fire mark and a timing mark the mark on the right of the 2 needs to be lined up with the mark on the case. This all needs to be done on the COMPRESSION stroke not the exhaust stroke.
I would pull the plug and use an allen head tho turn the motor over thru the inspection hole on the clutch side, check to make sure all marks line up. The cam lobes shouldn't be touching the buckets and that will let you know your on the compression stroke at top dead center. If you not sure about TDC get a screwdriver and put tape on the end (protect piston from scratching) and put it down the spark plug hole, watch for it to reach it's highest point and that should be TDC. DO NOT KICK IT OVER WITH THAT SCREW DRIVER DOWN THE HOLE, turn it over by hand. Hope this helps.
I hate to admit this, but make sure there isn't a rag in the air box blocking air getting to the motor.
According to Honda they have had issues with the fuel injectors, which are fickle and small amounts of dirt & contaminiation prevent fuel pressure buildup during starting. It gets so bad that the fuel pressure bleeds off in less than 10 min, and after successive attempts kicking the unburnt fuel not only floods the engine, but can wash down the cylinder and wash the oil out of the left crank bearing causing it to fail on startup (especially because everyone rev the shit out of their bike to "clean it out"!).
Recommendation from large aftermarket parts supplier FOR ALL FUEL INJECTED HONDA DIRT BIKES is to install an in-tank micro cloth mesh screen on the fuel tank filling cap to prevent dirt entering tank from fuel filling.
Should have installed the tank screen from new, & listened to my "know-it-all" buddy!
Cheers,
David
Pit Row
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