David Jenkins
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| posted on 23/2/08 at 04:40 PM |
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Yay! Running on bike carbs!
You know how it goes... today I fixed up the throttle and choke cables, decided to go and get some petrol so that I could test that I didn't
have any leaks in my new pipework and to set the regulator... and got to that point when I was sitting there thinking - "shall I?". I
just had to connect everything up and spin it over!
A couple of tries and off it went - running rough, almost certainly because the carbs need balancing, but the intake roar did sound nice. It was also
'interesting' to see the haze hovering just in front of the trumpets! 
They're in desperate need of a decent tune now... and a sausage filter and a throttle stop... but those are the next jobs in the coming week.
Anyone know of a decent rolling road in the south Suffolk / north Essex area who can cope with Megajolt and bike carbs on a car engine?
cheers,
David
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jacko
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| posted on 23/2/08 at 04:54 PM |
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Congratulations it good when it all comes to gether 
sorry i don't know of a r/road down south
Jacko
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RichardK
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| posted on 23/2/08 at 05:01 PM |
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Nice one fella, not sure if you put vacuum take offs on your inlet pipes but if you did and want to borrow my morgan carbtune 2 you're more
than welcome.
Cheers
Rich
Gallery updated 11/01/2011
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x_flow57
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| posted on 23/2/08 at 05:21 PM |
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David,
I rang these people
Ipswich Rolling Road
and they appeared to know what they were talking about, might be worth a call.
ATB Nick
<<<<<For Sale
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DarrenW
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| posted on 23/2/08 at 08:52 PM |
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Very well done indeed. Im chuffed for you.
The induction roar is rather nice isnt it. Similar to twin webers but with a smattering of smugness
Did you see al 4 pistons moving when you rev it up? Mine didnt at first, bit of a bugger to get the ZZR carb diaphragms to seal. Car still ran as
well.
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David Jenkins
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| posted on 24/2/08 at 09:47 AM |
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quote:
Originally posted by vinnievector
,wot was your inicial set up to get things running .
The only thing I did was open up the main jet to 1.6mm. I have no idea yet whether the mixture is right or wrong - once I've done a few more
details I'll get the Colortune out to check that I'm in the right ballpark, and then start to fiddle with things.
I wish there was some guide to the bike carb tuning process though... 
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David Jenkins
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| posted on 24/2/08 at 09:49 AM |
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quote:
Originally posted by DarrenW
Did you see al 4 pistons moving when you rev it up? Mine didnt at first, bit of a bugger to get the ZZR carb diaphragms to seal. Car still ran as
well.
Didn't get that far - after running for a minute or so I spotted a couple of petrol leaks that needed sorting, and didn't have time to run
it again after I'd fixed them.
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David Jenkins
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| posted on 24/2/08 at 09:53 AM |
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quote:
Originally posted by x_flow57
David,
I rang these people
Ipswich Rolling Road
and they appeared to know what they were talking about, might be worth a call.
ATB Nick
Nick,
I took my car to them a while ago - I got the impression that they were 'reasonably competent' with carbs, but not brilliant. I ended up
with the same settings that were on the car when I arrived there!
My main concern for the moment is to get the settings reasonably close - not too lean nor too rich - before I drive any distance.
[Edited on 24/2/08 by David Jenkins]
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takumi
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| posted on 24/2/08 at 10:06 AM |
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I would avoid LPS,
There idea of tuning is plugging a laptop into your ecu and downloading a superchips map.
I even doubt they know what a carb is...lol
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David Jenkins
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| posted on 24/2/08 at 09:53 PM |
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Rich,
Apologies - I responded to everyone's post apart from yours! makes me sound very ungrateful...
I don't have vacuum take-offs so I can't use that sort of gauge - I'll have to use one of those things you stuff into the front
orifice...
cheers for the offer though.
David
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chunkytfg
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| posted on 25/2/08 at 12:23 PM |
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If you dont mind travelling a bit further afield then i'd visit PDQ over near slough.
Rob the dyno guy for cars is very very good and definately knows what he's on about.
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David Jenkins
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| posted on 1/3/08 at 10:48 AM |
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Tuned it roughly by ear this morning - now running a lot smoother. I even have a decent tick-over now, at 800 - 900 rpm, something I never had with
the down-draft weber.
Took it for a quick trip up the road and back - pulled very nicely, no hesitation on throttle-up, and sounded nice.
Distinct pong of petrol every time I accelerated, but that may well be due to the lack of an air filter. There are no signs of flooding or leaks, and
the plugs are a reasonable colour (maybe a vague hint of a weak mixture - but I know that's not a reliable guide, before anyone says anything).
I also put my Colortune on it, and that's looking reasonable (again, not a very accurate measurement, but useful as a guide).
So it's just a filter and a decent tune-up to go.
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