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 Bizarre
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| posted on October 23rd, 2009 at 04:26 PM |
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I thought a rebuilt one was about $170ish
No offence to any shops but pretty sure those cost effective starters are from China and have cost effective bearings in them
Futue te ipsum!!!
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 trickysimon
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| posted on October 23rd, 2009 at 04:40 PM |
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Yeh they said it would be around $100 to rebuild if the armature is still good.
But its stuffed and they don't have any, so may as well just get a different starter.
Anyone got a good second hand one?
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trickysimon
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| posted on October 24th, 2009 at 01:32 PM |
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Well picked up a secondhand one off one of my mate's dad for $50.
Listen to that baby pur
Not really sure what I'm doing timing it though  
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trickysimon
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| posted on October 25th, 2009 at 10:29 AM |
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Well its running way rich on the jettings that came with it:
Idle: 50
Main Jet: 160
Air Correction: 185
Venturi: 24
Reading that link that Barry posted, I should have somthing more like:
Idle: 50
Main Jet: 105
Air Correction: 185
Venturi: 24
Does This sound about right?
What other Jets should I buy at the same time and where do I get them from?
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Bizarre
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| posted on October 25th, 2009 at 11:11 AM |
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is it backfiring??
I would be trying to increase the venturis rather than the main jets??
Maybe get them bored out??
I have zip experience with DCNF's but 24's seem way too small
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trickysimon
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| posted on October 25th, 2009 at 11:17 AM |
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Blowing rich smoke and I don't think I've ever seen sparkplugs that black
Is there anywhere I can buy DCN/DCNF venturis instead of getting them machined?
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Craig Torrens
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| posted on October 25th, 2009 at 11:26 AM |
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Ring your engine builder, they should be able to tell you the right setup for the engine.
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Bizarre
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| posted on October 25th, 2009 at 11:27 AM |
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http://cgi.ebay.com/ebaymotors/8-Weber-Carburetor-Chokes-for-40-DCN-and-a-DCN...
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colonel mustard
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| posted on October 25th, 2009 at 11:43 AM |
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Not that you will care but.... mine are:
Idle: 55
Main Jet: 125
Air Correction: 220
Venturi: 32
that setup was apparently designed for (twin carbs on a) 1776
"Hi I bought them 2nd hand, I believe that they were on a 1776. They have 32 vents, 55 idles, 180 air, f24 emulsion tubes & 125 mains. The
mains..." - steve carter...
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trickysimon
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| posted on October 25th, 2009 at 11:50 AM |
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Those are some big Air Correction jets, have you run it yet?
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colonel mustard
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| posted on October 25th, 2009 at 11:53 AM |
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nope. I'm only running a single, as its a 1600. I've chatted with Joel, and he thinks the current setup will be suitable for the exhaust im running,
to just get a little bit more power out of it.
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trickysimon
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| posted on October 25th, 2009 at 12:00 PM |
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| Quote: | Originally
posted by Craig Torrens
Ring your engine builder, they should be able to tell you the right setup for the engine.
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He's in the USA 
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trickysimon
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| posted on October 25th, 2009 at 12:07 PM |
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Just got an email back from Aircooled.Net
They said this should be pretty close:
Idle: 50
Main Jet: 105
Air Correction: 185
Venturi: 24
Maybe 45-50 idle
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Joel
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| posted on October 25th, 2009 at 01:31 PM |
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might be a bit small on the mains
im running 125 mains in my 1776 with 45 idles and 180 airs
but thats with 28mm vents
i had some new venturies spun up for my dellorto by a guy on ebay was $45 for 2 what ever size i wanted
ill try and track down who it was but it was 3 years ago so cant promise anything
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Bizarre
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| posted on October 25th, 2009 at 01:59 PM |
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4.2 x 24 = 100.8
Jon Connolly (AC.net) is very good with Webers
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trickysimon
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| posted on October 25th, 2009 at 04:11 PM |
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Joel that would be great thanks.
Don't wanna be choking my engine after all this work 
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trickysimon
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| posted on October 25th, 2009 at 07:08 PM |
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Think there might be a leak somwhere on the drivers side carb.
Adjusting the passenger side idle mixture screw did what they were supposed to.
But when we went to do the drivers side it didn't really change anything.
5 seconds after we turned it off it popped and and a flame came out of the exhaust.
We put synchronising tool on carbys to see what was going on.
On the passnger side carby the ball sat at about the 1st line up. Then when we put it on the
drivers side the ball shot right to the top, hence the thought of a leak somwhere
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Craig Torrens
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| posted on October 25th, 2009 at 07:17 PM |
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that just means your throttle on the drivers side is open more than the passenger side.... you need to set these first before you do any tuning of the
mixtures.
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trickysimon
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| posted on October 25th, 2009 at 07:24 PM |
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Meh maybe Phil can explain it better than I can
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cesiumfrog
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| posted on October 25th, 2009 at 10:42 PM |
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ok...i'll have a go
problem. don't seem to be able to achieve a satisfactory idle.
set mixture initially to 1 turn out each and idle screw 1 turn in
timing was set to 30degrees at est engine speed between 2 and 3k rpm
at first start engine idles a little fast..maybe 1000-1200rpm at 12-15 degrees atdc.
managed to adjust mixtures a little b4 engine sped up considerably, turned off.
set all mixtures to the same as rough adjust- 3/4 turn out, turned idle screws in to 1/2 turn out.
engine still runs fast (way fast)
let it rest a while,started again, put sync.thing on left side, ball at first line and steady, put synch tool on right side and ball flew to top and
engine tried to stop? pulled it off and engine sped up again.
observations.
inside right carby appeared wet compared to left side a few minutes after turning off.
right side carby top gasket looked a bit tattered..? air leak
a little dirt/sludge/sediment in fuel bowl/float chamber
does this sound like needle and seat?
what effect would a very small air leak under the top cover have?
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trickysimon
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| posted on October 26th, 2009 at 04:25 PM |
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Thanks Phil.
Is $120 a pair for new DCN venturis a good price? Seems a bit steep to me 
How much would boring mine to 30mm cost?
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Bizarre
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| posted on October 26th, 2009 at 05:56 PM |
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for a pair do you mean 2 or 4??
Futue te ipsum!!!
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colonel mustard
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| posted on October 26th, 2009 at 06:08 PM |
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| Quote: | Originally
posted by trickysimon
Thanks Phil.
Is $120 a pair for new DCN venturis a good price? Seems a bit steep to me
How much would boring mine to 30mm cost?
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how much for a set of idf venturies?
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trickysimon
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| posted on October 26th, 2009 at 06:15 PM |
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Nope I mean a pair, stuff that I reckon. I just decided to buy some 105 mains and some rebuild kits for now.. I'll just get
them bored out if I want to go bigger in the future.
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Bizarre
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| posted on October 26th, 2009 at 08:47 PM |
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Get the 8 off from ebay for $112US
They are 32's
Reckon they are the size you want
Futue te ipsum!!!
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Bizarre
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| posted on October 27th, 2009 at 07:36 AM |
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as for the carb
is the linkage disconnected?
what does it suck on all 4 pots - not just left and right??
have you taken the manifold off?? Is it loose or binding??
What is the plug colour on the right hand side?? If it is an air leak it will send the plug bright white over riding the rich jetting
are the trottle plates definitely shutting off?? not jaming open??
what are the air by pass screws set at?? turn them all in
Futue te ipsum!!!
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cesiumfrog
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| posted on October 27th, 2009 at 08:58 AM |
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thanks bizarre,
yep linkage disconnected,
these carbs have a single throttle shaft each side so idle screw adjust both pots together.
however both left pots were the same and putting uni syn on the right side choked the engine (after the ball was sucked to the top of the gauge)
initially the manifolds were a little loose (the right side was sucking air ) tightened them up. hmmm.. i guess there could be an issue there, will
check, but that would create a lean issue?
plug colour on the right is black blackk black
left is grey black
throttle plates....yeah, the stops are very close so they would be closing off properley
air bypass screws? don,t know the answer to that one....don't think these have them...iusually located at the base of the carb ? i'll check..but
they would also create lean running?
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Joel
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| posted on October 27th, 2009 at 09:29 AM |
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DCNs are very basic
no air bypass or anything like that
just set the throttle stop screw about 1/2 a turn out and use the mixture screws to set the idle
if your more than about 1.5 turns out the idle jets are too small
less than 1 turn out and there too big
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trickysimon
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| posted on October 27th, 2009 at 11:26 AM |
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Just got an email back from supplier after asking them for some 105 mains:
"I recommend double checking the jet size you need as there is no way that you would need jets that small. Weber dont even make them that small and
we have never seen a DCN fitted with anything smaller than around 120 which should be regarded as the minimum size....."
I'll take the carbs off tonight and measure the venturi's, get rid of all confusion.
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Bizarre
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| posted on October 27th, 2009 at 12:06 PM |
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just a thought
Have you disabled the enrichment circuit??
Futue te ipsum!!!
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