Carb balancing and meddling help

[andym]

Yet again I took my bike in to college to balance the carbs and quickly learned that was a big mistake

Since it's awkward to get a manometer fitted on the cbr (why they put the holes on the engine under the carbs I'll never know), I decided to try doing it with an IR thermometer to try balancing the header pipe temperatures (didn't know if it would work, but worth a try).

After much mucking about I finally set about balancing them and had something along the lines of: 1 235°c, 2 260°c, 3 280°c, 4 240°c, but one of the lecturers came over with a length of hose and said that only carbs 1 and 3 were drawing air in. After explaining that there wasn't anything to adjust inside them, then pointing out where the balance screws were he set about balancing them by listening down this length of pipe.

At points the idle ended up around 4k and screwed the idle adjuster out of the carbs trying to bring them down. After around half an hour of this it was getting too close to lunch time so I said that would have to do them

I had about 10 minutes left to put everything back together by this point, after getting it all together I ran it and checked the temperatures and they were around: 245°c, 2 200°c, 3 265°c, 4 290°c and still 1 & 3 were the only ones that sounded like they were pulling air through the carb.

After college I decided to come home the long way and found when I came up to traffic lights the idle would bounce around between 1 & 2k rpm, the power felt about the same as it always has, but it was slow to respond when releasing the throttle.

So now I'm going to have to try making adapters and a manometer.... anyone know how to go about making adapters (and maybe something that can be taken to a more suitable location)

[eddypeck]

Do you not just need one of these?

https://www.ebay.co.uk/itm/Motorcycle-Carburettor-Carb-Vacuum-Gauge-Balancer-2-4-Cylinder-Set-Guage-/141403210395?pt=LH_DefaultDomain_3&hash=item20ec49c29b

It should come with a selection of adapters and lengths of pipe. Personally I've never owned a CBR, but had a few Kawasaki inline 4's can't imagine they're that different.

[mentalboy]

[andym]

[Iain.]

[mentalboy]

I seem to recall that when I set up the permanent extension pieces the only way I could do it and retain most of the skin on my knuckles/sanity was to remove the carbs. Ballache the first time but so easy every time thereafter.
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Make mine a Corona.

[Copycat73]

oh !! happy memories of carb balance on a Honda cbr motor..

on the cylinder head...

iirc.. the vacume pipe to the fuel cock is the first connection to the gauges... yes ?????

the other three are a simple blankin screw ... yes ???
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Whatever I post I have no citation and no intention of providing one..
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[mentalboy]

[Copycat73]

[andym]

[Copycat73]