1 Thank you FORUM. Problem solved; and I didn't even need to ask the question! Tue Dec 16, 2014 6:29 pm
sidecar paul
Life time member
Let me explain:
The outfit hasn't been running too sweetly of late, getting progressively worse. Rough at low engine speeds but seemingly OK above
3000 rpm.
I suspected the AFM, maybe a sticking flap, but changing it made no difference.
Last Friday I realised that it was running very rich and, remembering posts about this topic, I used the search facility to find references to 'RICH MIXTURE'.
A good read came up with many ideas, but Krambo's thread seemed to match my problem perfectly, with the following suggestions.
So, 3 possibilities, fuel pump, fuel pressure regulator or a blockage in the return feed to the tank.
Using Bert's (Crazy Frog) excellent 'Trouble Shooting Guide', I connected a pressure gauge to the fuel rail via a tee piece......WOW pressure off the scale!
Next, check the pressure coming from the fuel pump........again off the scale. I used the tank off the solo to confirm that the FPR was still functioning correctly and hadn't suffered from the excessive pressure. Yes, we all need at least 2 K's
The conclusion was, therefore, a duff pressure relief valve in the fuel pump.
Today the new pump arrived and, after resetting the bypass screws (I had tried to get a decent tickover with the fault, so they were way out), all is back to normal.
So, you see, without this FORUM I, and probably many others, would be struggling to keep my bikes running.
Hence a big THANK YOU!
Paul.
The outfit hasn't been running too sweetly of late, getting progressively worse. Rough at low engine speeds but seemingly OK above
3000 rpm.
I suspected the AFM, maybe a sticking flap, but changing it made no difference.
Last Friday I realised that it was running very rich and, remembering posts about this topic, I used the search facility to find references to 'RICH MIXTURE'.
A good read came up with many ideas, but Krambo's thread seemed to match my problem perfectly, with the following suggestions.
So, 3 possibilities, fuel pump, fuel pressure regulator or a blockage in the return feed to the tank.
Using Bert's (Crazy Frog) excellent 'Trouble Shooting Guide', I connected a pressure gauge to the fuel rail via a tee piece......WOW pressure off the scale!
Next, check the pressure coming from the fuel pump........again off the scale. I used the tank off the solo to confirm that the FPR was still functioning correctly and hadn't suffered from the excessive pressure. Yes, we all need at least 2 K's
The conclusion was, therefore, a duff pressure relief valve in the fuel pump.
Today the new pump arrived and, after resetting the bypass screws (I had tried to get a decent tickover with the fault, so they were way out), all is back to normal.
So, you see, without this FORUM I, and probably many others, would be struggling to keep my bikes running.
Hence a big THANK YOU!
Paul.
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'84 K100RS (0014643) (owned since '85), 86 K100RS (0018891) with Martello sidecar (built as an outfit in '88),
'51 Vincent (since '67),'72 Montesa Cota (from new), '87 Honda RS125R NF4 (bought 2015)
....No CARS never ever!