Taking the SALT BIKE to the DYNO // paul brodie's shop

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#aermacchi #saltflats #dynotest #fussyframebuilder
#racebike #bonneville #diy #fabrication #machinist #steel #motorcycle #motovlog #shop #custom

[hordboy]

Paul, 25 year dyno guy here. 1) megaphone pipes and/or long duration cams will lead dyno sniffers into the weeds 2) I remember thinking in a previous video that something was not right with that choke delete. But I don’t know what it was. 3) throw a Keihin FCR on the thing, they are so easy to tune! 😀

[davidwarren]

Watching your face while you were lettin' 'er rip on the Dyno was priceless 👍👍

[randombuilds]

When I tuned my drz400 I installed a wideband and learned quite a few things. All the recommended needles worked great off idle and wide open, but were stupid rich at cruise. Once I found a needle that got cruise leaned out I ended up larger on the main to compensate for the different needle and position. I also learned the 3x3 hole in the airbox was not nearly enough, now my airbox is basically non existant, but it runs clean everywhere. It's a real rabbit hole to get jetting to all work together.

[grantjohnson]

Great video showing the struggles of a build.

All the best Paul!

[TwoWheelWarrior]

These are the Daves he knows, he knows. These are the Daves he knows.

[bigbird]

You look like a skinny Jay Leno with the grey hair and the Canadian tuxedo. Well done Sir!

[mikekares-bq]

In my 70s and still learning . The best motorcycle mechanic I ever knew passed away suddenly of Heart failure a really wonderful guy always willing to help . Now I'm on my own, He really left a lot of parts and the like behind . His son is going to carry on but lives in Alaska . Thanks Paul for the interesting content, have not turned in for a bit .

[speedpedals]

A bunch of years ago, I built a BSA 441 into a 500cc and got a cam from Norris Camahaft Grinders (I believe they are defunct for some time). I adapted Chrysler electronic ignition, left the centrifugal advance. I cut the off the distributor cam and brazed the reluctor onto the shaft to keep it from turnig. I also used an automobile coil instead of a Lucas. I could not afford Joe Hunt magneto What I am getting at is I purchased a Lectron flat slide carburetor about 2 or 4 mm larger (forgot which) than the stock Amal. That bike never skipped a beat with that carb. It didn't matter what the throttle opening was, twisting it open produced honest acceleration to top end. It never fouled a spark plug and it burned clean. You can only raise or lower the needle to alter jetting in the Lectron. I have seen then from time to time on E bay but I am not in the market to purchase any so they are rare today. Mikuni won out globally. Good luck with getting the carb dialed in. You may have to go to a Mikuni but knowing you from the videos, I bet you will get it working good. Good Luck at the salt flats. Have Mitch record everything dealing with the inspection to every race and what had to be done in between. It will be a great series of videos.

[fepatton]

I like how Dave apologizes. 😂 Very interesting to see how this process plays out in real life. It will go better next time with all the data you’ve collected. Cheers!

[crozwayne]

Every one thinks a few mods, a noisy exhaust, a dynojet kit (modernish bikes only!) and voila, a power increase to compete on the grid at Moto GP! As a builder of bikes among my engineering activities, tuning a self made race bike is a thoroughly long task! Good luck Paul! great build

[JaySiewers]

Back in the 80's I made a manifold adapter to run a Zenith Stromberg (think it came off a Volvo) on my Harley. So tuning issues was to get the correct taper on the needle. I made a chart, measured the diameter every 1/10 inch (.100") with a micrometer. Then I made charts to show different rates of taper at every 1/10". I used Amal needles and fine filed them to size in my drill press, sanded them down to a 600 sand paper. I then had to sleeve the top of them to hold them in the slide. The second needle worked the best, spot on from idle, midrange, and full throttle. Interesting, the difference at 1, 500" to sea level was just 1/2 turn more open of the main jet. At sea level the clutch would slip, but not at 1, 500'. You could also raise your needle by making small washers under it in the slide too.

[yodasbff]

Great video, thanks for sharing. That bike sounds wicked mean. None of my Harley Sprints ever sounded that robust. 👍

[thedr]

dyno's a such a great tool, but they can be a real pain in the ass too, glad you got a god one operated by a guy who knows his stuff.

[malcolmcavalier]

You need to get close on the main jet first for your WOT operation and then clean up the mid range. Float level check needs done before any tuning. Also try tuning without the velocity stack on the carb, I have had problems with them effecting carburetor operation and needed to find a different style of stack. Tune for the task, WOT in your case, you don't need to worry about response coming out of the turn.😀

[samifisherman]

finally .. the ermaky gets a chance to roar !! ... and I suggest to try a steel and cotton combo air filter .. it may help with the ventury action in the mid range by sucking more fuel with the help of the increased vacume in the carb without the need to further enlarge the main jet .. the 350 will do in conjunction with a "low obstruction " air filter ... great video .. hope it helps ..

[MikeSudsbear]

Definitely seems mid range / needle related. Since it's running lean at mid throttle with the needle in the top position, a thinner needle may be what it needs.
Jetting is a bit of a black art.

[philiparrington]

We're riding out there in a few weeks! Looking forward to seeing your runs!

Going to be high and dry out at the flats

[retromechanicalengineer]

Paul, two publications which may help are 'The Carburettor Manual' and 'Choosing and Adjusting Slide Carburettors', both published by Dell 'Orto. Your Dell 'Orto dealer should be able to get them. Here in England, it is Eurocarb.
They are invaluable for working out what is going on at any given throttle opening.
Best wishes, Dean.

[matthewmarino]

Sounds deep & wonderful. Especially for a small displacement. Props.

[Metal-Possum]

Carburettors are great... I do love the purely mechanical aspect of them though.