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Old 01-09-2018, 09:39 PM
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Default fuel pouring out exhaust

I have followed a couple of threads with this however am still a little unsure.
I bought a CBR600F4i that had been sitting for some time. New battery and some fuel and it started almost straight away. Noticed fuel dripping from exhaust join to muffler. Undid and removed muffler then started bike and fuel is coming out like a hose swirling out pipe covering back wheel.
this is not just a "rich" issue...
consensus seems that the fuel pressure regulator is most likely but what I don't understand is how so much unburnt fuel is getting through?!? surely it would burn/explode as hot gas comes out other cylinders?
Other opinion is stuck injector but I'm a carb bloke (yes I'm old) and not sure how to test this.
Bike actual revs under no load and appears to run OK??

I seek the help of the wise ones of this forum.

This is my first "modern" honda have 12 others from Z50 to Goldwing!
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Old 01-10-2018, 03:30 AM
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Hi Paul , firstly I would pull the plugs out and see which cylinder isn't firing, is the oil contaminated with petrol? have you got any backfiring
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Old 01-11-2018, 02:10 AM
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Originally Posted by CaBaRet View Post
Hi Paul , firstly I would pull the plugs out and see which cylinder isn't firing, is the oil contaminated with petrol? have you got any backfiring
Have since read about fuel pressure reg and I think thats the problem. Fuel is coming out the vacuum pipe hole and feeding directly into cylinder!Have ordered new FPR and will report. Still amazed though!
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Old 01-11-2018, 02:54 AM
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Hi Paul, see your in Oz ,so morning here evening with you, did you try the vacuum pipe off the FPR trick to test.
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Old 01-11-2018, 04:21 AM
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Originally Posted by CaBaRet View Post
Hi Paul, see your in Oz ,so morning here evening with you, did you try the vacuum pipe off the FPR trick to test.
Yeah did today, pissimg out! New FPR ORDERED.
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Old 01-11-2018, 04:26 AM
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Nice one
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