New member (London - Lewisham [Sydenham])

Post by **Doggo** » Wed Sep 17, 2014 1:22 am

Bit embarrassing really as not that much... oil pipe between oil cooler and crankcase developed a pinhole leak, just through corrosion/age. Bit of a pig to get at though. And of course the MOT's now expired

. Probably needs a chain/sprockets about now too. I've not been able to run the engine due to the leak for a while so I'm hoping the carbs won't be gunged now

It should be into the garage early next week, so hopefully nice shiny photo's uploaded early October

Never actually listened to a CBX. Seems a good idea.

Your brakes surely justify the benefits of keeping a house full of parts!

Not sure about the VFR12. VFR8 still seems a better idea to me, but I would lke to try one.

prelude91 · Post by **prelude91** » Wed Sep 17, 2014 1:33 am

Quick dose of redex may help with the carb issue, I've also opened the carb bowl drain plugs some times and left the fuel tap open to flush through, not possible I don't think if you have cv carbs, tho'. regards my brakes, I'm a bit anal about keeping old parts, situations like this will hopefully justify that approach. The guy on the ferry highlighted several issues with the VFR as I was interested how it compared to the FJ, ironically I'm traditionally more a honda man than a Yamaha man. He said it was cumbersome, heavy, and hard to manoeuvre at low speeds, ironic as it has a smaller wheelbase and should be lighter than the fj, and he was 6ft. 3 in and at least 3 stone heavier than me and the tank range is limited. But it will cruise all day at 140!! Hey ho , a few more years with the fj on the cards.

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Wed Sep 17, 2014 12:04 pm

is that what the garage have told you prelude 91?

Ordinary brake hydraulic circuit and the abs hydraulic circuits are entirely separate, but the ordinary brake hydraulic circuit does of course pass through the abs modular unit.
However a leaking abs solenoid valve would not prevent the ordinary brakes from functioning perfectly normally, it would just prevent the abs from functioning correctly.
I did a lengthy post somewhere recently explaining how I'd interpreted that the 2 circuits exist separately but allow the abs circuit to act on the ordinary brake circuit.

If the seals around the pistons that sit between the ordinary brake hydraulic circuit and the abs hydraulic circuit have failed, then that could lead to a reduction in braking pressure in the ordinary circuit. but that would require more than one seal to have failed on a piston and is different to the abs solenoid valve. Also you should have seen a drop in fluid level in one reservoir and the other probably overflow I'd have thought, as the 2 hydraulic circuits mixed and the pressures equalised?

I guess this may actually come down to differences between what 2 people (and the Honda manual) call the various components inside the abs modulator unit

I don't have the manual to hand so I'm not 100% sure I've used the right names in this particular post!

Either way, if they know you have a leaking solenoid valve then you need the abs unit repairing anyway, so that's cool. I just hope it sorts whatever else appears to be the problem with the ordinary brake circuit.

Do you still need me to check the difference in 3g/4g units, or are you sorted now?

prelude91 · Post by **prelude91** » Wed Sep 17, 2014 1:01 pm

Hi wurly, it would be nice for you to check the 4g modulator, as a standby for me. As we speak, the garage are dismantling the old unit to fit the good solenoid into the existing modulator body. I discussed the bleed issue with Chris, thebus, and he has confirmed that the diagnosis is correct. If the garage manage to get the brakes bled, and pass the M.O.T. I may need to go back to chris at Salisbury to have the abs system reset on the alb reader. I've also found a scrap 3g in scotland that may yield a modulator just in case. If you look at the main brakes reservoir on the 3g the two pipes exiting it, definitely go directly in to the abs modulator, which has been the root cause. Over the weekend I put a current across the rear solenoid and it failed to energize. I'll keep you posted on progress, thanks for your help.

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Thu Sep 18, 2014 11:40 am

@prelude91
Should be getting over the barn tonight and be able to compare the 2, but in the mean time, I spotted this today as another back up, if you need it...
http://www.ebay.co.uk/itm/Hydroaggregat ... 23316a5dc9

prelude91 · Post by **prelude91** » Thu Sep 18, 2014 10:17 pm

Thanks, wurly, I popped in to the garage today, they've yet to strip the spare modulator to take out the rear solenoid and hopefully successfully swap over. Thebus (Chris) has confirmed the garage diagnosis of the solenoid affecting the rear bleed. He also has access to a spare modulator seal kit, which the garage are now aware of. I'll keep my eye on the German (?) e-bay site, although the orientation of the image doesn't allow me to confirm if it's exactly the same. There's also a breaker in Scotland (ahem) which may yield a good spare modulator if needs be. I'll keep you informed.