Discussion Carb diaphragms for FZR

You can't be that bad with composites to have made that tail section.

You could try using thin ~3mm high density foam and a heat gun to form it to generate your sections, fill the gaps and do a laminate layer over the top and you've got your plug to make the mould.

peace out

 

The radiator under the seat is a brilliant idea, one that the tularis used - trying to find the link with the detailed specs for the tularis but coming up empty ATM

 

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Well I had a VF750 that would always switch on the cooling fan if it was left sitting idling - same for most cars, so I think your hypothesis is pretty much correct.

The upper and lower limits look good as there is an optimum combustion chamber temperature.

I remember years ago when Kevin Schwantz was on the Suzuki and down on power keeping him from the podium that he mentioned that the water temperature was 85 degrees, which was obviously too high and the bike was suffering power fade during the races.

Obviously that's more crucial to a 500cc two stroke GP bike as they apparently lose power during the race because of rings softening, which is exacerbated by higher than normal temps.

But the same principles apply to road going machines, everything has it's optimum conditions in engineering terms.

peace out

 

BTW I always use a full gas respirator and gloves when using epoxy - sensitisation is something I've read about and never want to experience first hand

 

if you can get the seat to me i can organise a mould to be made. need to do in sections that bolt together.lots of carnauba wax and elbow grease. then tooling gelcoat, then satin cloth. then glass.as it cannot be removed in one piece due to shape needs bandsawing, edges moulded on an bolted together. lots of wax as release agent then gelcoat and glass.easier to make a mould and have plastic part made.probably cheaper.

 

Yes carbs are apart. I bought the bike during the week, basket case. But it seems to be mostly all there. I looked in the carby box & the diaphrams are shot, no holes but poor condition, squashed up & all out of shape.
I will start the rebuild next week. I've been busy today on the FZR, the fairings turned up $435 delivered & pretty good, they fitted pretty well except for 2 minor pieces which can be sorted. See the pics.

 

Very nice, looks awesome

 

I am after a workshop manual if thats what youve got. I have a photocopier if you don't want to sell it. There's a 'Clymer' manual on watch on ebay but it ends up $67 delivered !
The diameter of the carb for thye diaphrams are

The overall diameter is 73mm & 68mm inside dia
Thanks for the help

 

Thanks for the manuals, much appreciated.
The diaphragms page looks good, I'll get into it this week when I get time.
Back to the painting, doing the FZR tank white at 2pm, fingers crossed, got some bloody solvent fizz in the clear job this morning

 

solvent fizz from humidity ,try running the air hose in a bucket of water to condense the humidity in the air and drain the compressor tank.

 

Ok, wondered if it was humidity. I always drain the trap & also let the tank hiss from the drain valve while in use to keep as much out of the tank as possible.
So do I have to run a longer hose through the bucket between the compressor & the trap? at the moment its just a normal setup on the compressor, sounds like a still setup? There is an Aussie filter on ebay that takes a toilet roll to soak up moisture about $100 I think. I've had this issue before & it was much worse, last summer & probably high humidity if I remember, the base coats are un affected only the clear & solids to a lesser extent.
Thanks for the tip

 

ok, helps to use heat lamps in closed shed to raise temp and have metal hot,use extra length of hose coiled in bucket of water to condense water from compressor to filter,[does not always work] ,pay a painter with heated booth, OR wait for dryer weather. humidity is a mongrel.give me a conversation with your phone number as if you are close can lend you a double length hose for a few days.

 

I've got plenty of hose thanks anyway. I'll set up the compressor better & buy a better filter. At the moment I'm just doing it in the garage, pretty rough I know but I make do. What if I ran the compressor in an air-conditioned room ? Thanks for the help, I've asked around but never got a straight answer, it's like witchcraft & no one will tell you the secret spells.