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sod's law

Posted: Mon Jun 28, 2010 3:50 pm
by cadetchris
well, its always a case of one step forward, 3 back and then a new path opens up with me.

so, for the observant out there, you will remember i fitted a HIF44 carb to primrose.

this resulted in the engine running like a bag of nails owing to it running fantastically rich, regardless of adjustments, it was just running naff,
having got very sick of this, i whipped this off, drilled two new holes, threaded them and reinstated the old 1 1/4 carb back on now. currently she is running a bit rough as the manifold is the size of a hanger and the carb is like a hairdryer at one end trying to blow a cobweb out the other door, so its not the best. the more annoying thing is, that in order to get the brakes it work, i had to drill a hole in the manifold for the vacuum pipe for the servo.

so that's the point where we are up to, but as normal another avenue has opened.
i have found a hif38 carb that is from a mini 1000, so this will fit the original stud holes, provide the correct air to fuel mixture in correspondence with the manifold and have an inbuilt air intake so i can plug my servo and rocker cover breather straight into it. this leaves me with a hole in the manifold, but the correct size carb and a proper air filter.

so that's what stage i am at. typically the bits i need usually come to light once i have modified the bits i already have.

Re: sod's law

Posted: Mon Jun 28, 2010 5:04 pm
by billlobban
I have an HIF38 fitted to my modified 1098 and following some advice from a well known Scotsman I fitted an AAA needle - works great but there isnt a take off for the servo?? I still take mine direct from the manifold

http://mmoc.org.uk/viewtopic.php?f=4&t=32678#p329701

Re: sod's law

Posted: Mon Jun 28, 2010 5:55 pm
by hotrodder13
might be the take off pipe for crankcase breather, i have a hif44 and thats what i put it on

Re: sod's law

Posted: Tue Jun 29, 2010 10:21 am
by Stig
Take-offs for servos and for crankcase breathers aren't interchangeable. The servo will need much more suck to work properly whereas the one for the breather will have about a 1/8" restriction in it to avoid sucking in too much air and weakening the mixture horribly.

Generally, the servo connects to the manifold (big pipe) and the breather connect to the carb (restricted).

Re: sod's law

Posted: Tue Jun 29, 2010 10:33 pm
by bmcecosse
You got it in one Stig. Servo (if you really must!) to the manifold and rocker cover breather to the carb . They can NOT be connected together! :roll: