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Jetting Keihin FCRs
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BrianK



Joined: 14 Jun 2007
Posts: 376
Location: Boston, MA USA

PostPosted: Thu May 22, 2008 6:36 pm    Post subject: Reply with quote

Checked the fuel screws - Right side was about 2/3 turn out; I left as is. Left was about 1-1/2 turns out; I reduced it to 1 turn.
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Jeandr



Joined: 22 Jan 2008
Posts: 87
Location: Canada

PostPosted: Thu May 22, 2008 6:42 pm    Post subject: Reply with quote

BrianK wrote:
Progress report:

Jean, how you doing with yours?

- B


Still quite a ways from riding, the weather is nice now and I ride my pushy as much as I can (gotta keep fit and I have a bicycling trip in June, start in Montreal, ride to Boston, then to New York and ride back home) not to mention the job jar (fun stuff like painting windows, pulling weeds...) which for some strange reason keeps filling up.

Jean
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BrianK



Joined: 14 Jun 2007
Posts: 376
Location: Boston, MA USA

PostPosted: Fri May 23, 2008 6:09 pm    Post subject: Reply with quote

Today's scintillating chapter of As the Carb Turns:

Slow air screws were both (!) at one turn out. Turned them an additional 1/4 turn out.

Leaner and leaner....when will it seize?...round and round the crankshaft goes...for now!

Tune in tomorrow for the next episode of As the Carb Turns. Same Norton channel.
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4onthefloor



Joined: 04 Feb 2008
Posts: 25
Location: Switzerland

PostPosted: Sat May 24, 2008 1:34 am    Post subject: Reply with quote

A very good manual can you download from:

www.factorypro.com/tech/carbkei.html

this guy knows what he is talking ! If you have not a good basic set up, go to a dyno guy,that will save a lot of time and nerve !

I run these carbs on my triumph, and they are great pleasure, cutting like a knive. If you run the carbs without a airbox, a stumble a low revs and WOT is normaly!

Greetings Marco
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BrianK



Joined: 14 Jun 2007
Posts: 376
Location: Boston, MA USA

PostPosted: Sat May 24, 2008 4:05 pm    Post subject: Reply with quote

Thanks Marco, all information welcome!

Based on a very small sample, I may have raised MPG to 39. That's a bit more like it, if it's not an illusion.

BTW, there are no flat spots whatsoever in this bike's powerband (and I do run K&N pods). I have been leaning it out bit by bit, but power has never been an issue. Just MPG and sooty plugs!

Actually, I was off the bike for a couple weeks sorting out a bearing problem (self-induced!) in the rear wheel. Riding my others, all of which are torque-monsters in their own right (but for the Beemer, which has other charms..), but when I got back on the Norton a few days ago, it still damn near snapped my neck when I first snicked into first and opened the throttle. I had forgotten the danged torque peak is at about 1200 RPMS. GOD I LOVE THIS BIKE!!!

Happy long weekend to all. Hope the riding is as good where you are as it has been - knock on wood - here. BritIron meet tomorrow in Oxford, MA, some 50 miles or so from here. Time to ogle the Beezas!
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BrianK



Joined: 14 Jun 2007
Posts: 376
Location: Boston, MA USA

PostPosted: Thu Jun 12, 2008 2:42 pm    Post subject: Reply with quote

Latest settings:

Needles in position #2 (were #5)
Slow fuel screws 1/2 turn out
Slow air screws 2 turns out
Replaced #152 main jets with #145s.

Getting there....
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teeb



Joined: 18 Feb 2007
Posts: 46
Location: Hamilton, Canada

PostPosted: Thu Jun 12, 2008 3:47 pm    Post subject: Finishing motorcycles at this time of year Reply with quote

Jeandr wrote:

.....not to mention the job jar (fun stuff like painting windows, pulling weeds...) which for some strange reason keeps filling up.
Jean


I would recommend a high strength two part epoxy applied to the threads of a solid jar cap.
Wink

Its looking good Jean.
Are those Sun rims? Nice Suzuki front hub/brake - powdercoated? What is your 40 spoke rear hub from?
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Jeandr



Joined: 22 Jan 2008
Posts: 87
Location: Canada

PostPosted: Sun Jun 15, 2008 8:34 pm    Post subject: Re: Finishing motorcycles at this time of year Reply with quote

teeb wrote:
Jeandr wrote:

.....not to mention the job jar (fun stuff like painting windows, pulling weeds...) which for some strange reason keeps filling up.
Jean


I would recommend a high strength two part epoxy applied to the threads of a solid jar cap.
Wink

Its looking good Jean.
Are those Sun rims? Nice Suzuki front hub/brake - powdercoated? What is your 40 spoke rear hub from?


Sorry for the late reply, I was out cycling, did Montreal to Boston to New York with some friends and my daughter. this was her first long trip, first century (100 miles). Over 6500 meters of climbing and close to 1000Km in 7 days, very proud of her.

Now for the answers, yes, these are indeed Sun rims, from Bucchanan's in California. The Suzuki hub was just painted with a HT black rattle can. I heated the parts to be painted in the oven to 200° F and sprayed it while it was warm, then I put it back in the oven for about an hour.

The rear hub is from an old Ducati 860, I think it's from the late seventies or early eighties.

Jean
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BrianK



Joined: 14 Jun 2007
Posts: 376
Location: Boston, MA USA

PostPosted: Fri Jun 27, 2008 5:57 pm    Post subject: Reply with quote

You guys tell me when you want me to shut up already, but for anyone interested:

Latest settings:

Needles in position #2 (were #5 originally). I think they could go to #1 position profitably, but I haven't done it - yet.

Slow fuel screws 2/3 turn out. I was getting some popping on the overrun at 1/2 turn, which 2/3 has mostly eliminated. I think a little
popping on especially "violent" overrun is a good thing. Could be wrong...

Slow air screws 2 turns out

Replaced main jets (originally #152s) with #140s, down from the #145s I had done last time around. Still seems not too lean at WOT, so all the better. May try 135s, but I think I'm close.

More than you may want to know, I realize, but in case it helps - particularly folks who have gotten FCRs supposedly "pre-jetted," and wonder why they're fouling plugs and/or getting 35 MPG....!
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ntst8



Joined: 14 Feb 2004
Posts: 117
Location: New Zealand

PostPosted: Fri Jun 27, 2008 11:27 pm    Post subject: Reply with quote

At least one here following the updates with interest, keep up the good work.
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BrianK



Joined: 14 Jun 2007
Posts: 376
Location: Boston, MA USA

PostPosted: Tue Jul 01, 2008 3:37 pm    Post subject: Reply with quote

Newest settings seem good so far NTST8. (140 mains; needle clip in #2 slot; stock pilot jets; slow air screw out two turns; slow fuel screw out 5/6 turn).

I will check the plugs in a bit. Would be interested in what mileage I'm now getting, but my speedo/odo is summering on Long Island (off at Nisonger's being rebuilt)....
For 35mm carbs I would think going smaller than 140 main probably not appropriate, but I may raise the needle clip to position #1 at some point and see what happens.

What settings are you running?
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ntst8



Joined: 14 Feb 2004
Posts: 117
Location: New Zealand

PostPosted: Tue Jul 01, 2008 5:17 pm    Post subject: Reply with quote

Brian

I have suffered from a severe bout of inactivity, on the Norton front at least, of late so still running the out of the box settings. Although between work and wet winter weather i have hardly ridden in the last 6 - 8 weeks so more like sitting than running.
I have a charging or charge light issue to sort out, and then some mufflers which seem to choke the engine above 4500 rpm to sort and then it is the carbs turn.
Being a bit of a lazy so and so i have contacted a local dyno shop to get an idea of costs to dial them in, and it did not sound too bad.
Will update when i make some progress.
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Chris



Joined: 21 Jan 2008
Posts: 102
Location: Eastbourne East Sussex UK

PostPosted: Wed Jul 02, 2008 8:30 am    Post subject: Keep at it Brian!!! Reply with quote

Keep at it Brian!!!

When I do eventually get my set I will borrow your settings.

all the best Chris
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BrianK



Joined: 14 Jun 2007
Posts: 376
Location: Boston, MA USA

PostPosted: Sun Oct 26, 2008 4:24 pm    Post subject: Reply with quote

Just to report back that the latest settings (see above) are IT. Bike runs like the proverbial scalded [choose your animal] and the last tankful yielded 56 MPG!!! (Those who've followed this winding saga will recall I was getting 35MPG with the "as-delivered" settings.)

LOVE these carbs! Took a bit of work (don't even ask me about installation - what a bear! - and they killed my fancy right side aftermarket petcock - bored a hole in it!) to dial in, but mighty sweet now.
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BrianK



Joined: 14 Jun 2007
Posts: 376
Location: Boston, MA USA

PostPosted: Sun Oct 26, 2008 5:20 pm    Post subject: Reply with quote

Just to report back that the latest settings (see above) are IT. Bike runs like the proverbial scalded [choose your animal] and the last tankful yielded 56 MPG!!! (Those who've followed this winding saga will recall I was getting 35MPG with the "as-delivered" settings.)

LOVE these carbs! Took a bit of work (don't even ask me about installation - what a bear! - and they killed my fancy right side aftermarket petcock - bored a hole in it!) to dial in, but mighty sweet now.
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The Unapproachable Norton Commando

At the end of 1967 the Norton Commando was announced.

The Norton Commando was greeted with a certain amount of scepticism because on first sight the commando appeared to comprise of the old Norton Dominator twin cylinder engine mounted at an inclined angle in a set of new cylinder parts.

It was not realized that the new Norton Commando Isolastic method of engine suspension damped out all engine vibration and produced a machine which had uncanny smoothness for a vertical twin. In due course the critics were silenced and the Norton Commando had the distinction of being regarded as the first of todays so called superbikes. There can be little doubt that the original design concept of the Norton Commando has proved correct, since comparatively few modifications of any real consequence have been made since production commenced during 1968.

Now nearly 40 years later Norton Commando riders like us are a breed of our own, and as far as we are concerned its still more fun to go for a blat on the old Norton Commando, and fast. As a Norton Commando owner and enthusiast, my goal here is to promote and give credit to those who keep the Norton name going.

It is more deserving to give credit to the Commando itself, for after all these years it continues to be respected. The original Commando designers like John Favill are those who deserve the credit for developing this incredible motorcycle.

The Norton Commando Roadster and Interstate of the late seventies, never died. Although the Norton Villiers factory dispersed the tradition lived on. Today Kenny Dreer in the USA is developing the new 952 CC Norton. What a great looking bike this is, and its engineering is still based on the original layout. It will be interesting to see how the new 952CC Norton does in todays tough motorcycle market. One thing is for sure, I would own one if I could afford it.