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Matteblack86

AFH on cbr600 carbs problem!

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Matteblack86

right basicly on overrun have constant poping/backfire and if reved too hard into 4th/5th it pops and bangs and has no power sometimes does it after overrun in 3rd as well

Set up is as follows:

Cbr600 vp carbs

Normal pilots

4x145 mains

Standard springs etc

No filters/trumpets

Mk2 ignition set up, (vac completely removed)

Mk4 1.6 escort ignition coil

Ignition timing set to 10 degrees (tad too much?)

Facet solid state fuel pump

Fuel reg and T-piece method (set at 1.5psi)

New plugs,leads, rotor arm and cap plus leads (made no difference)

Mechanical timing bang on!

Ss manifold to standard exhaust with center box removed.

Anyone have any pointers or tips would be greatly appriecated

Cheers

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MikeyMK

I don't understand your fuel system, the whole point of using a T-return is so you don't need a regulator.

Anyway, fuel is getting in. And it's burning. But not until it's in the exhaust..

Vac advance is either connected or it isn't, I've never removed the unit from the distributor, because it's holding the advance mechanism in place - just leave it with no pipe connected.

I don't know where people get their figures from with timing. Each engine is different and yours will have its own preferred degree. At idle you turn it until the revs are at the highest point, then retard it a few degrees to take a good couple of hundred revs off, and from there it'll just be a question of trial and error with fine-tuning it as you use the car. You'll feel when it's happy.

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Matteblack86

The reg was added in after as a precaution as with the t-piece method it would randomly kick fuel out the carbs and same with just the reg but both together has apparently solved that!

And apparently the vac advance was broken off as some point so completely removed and another hasn't been sourced yet

The timing was set with an advance gun and seemed to be the best for it but again it also feels slightly flat to them so will re-adjust the timing in the way you've said and see if that makes any difference

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mark_crox

I've removed the vac advanced but i've secured it in place at full advance just son it can't move around. Really don't know how likely that would happen. :)

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Matteblack86

Quick question mikey, the owner said the carbs we're really badly ballanced would that contribute to the problem?

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