Racing Megaphones on the LSR Superchaged K2

[smotorboy]

I have now finished making and mounting the full race megaphone exhaust system on the LSR K2 bike.... It will be interesting to see just where the torque peak is located in the rpm range with these units......Now, I must design and fabricated to a filtered air intake system....The air on the El Mirage lake bed is choked full of dust 90% percent of the time.....

[mantaray]

Nice work, nice painting too

[smotorboy]

Thank You Mantaray for the nice comment......

The wheels , rotors, and rear fender are looking fairly nice.... I'm dragging my feet a bit about sawing and modifying that very nice Morini fuel tank, but it will have to be done to make more clearance for my knees and the carburetor setup....

The glossy black frame is in very good condition, however it will be glossy red when I'm finished with all the tabs and such yet to be done....I learned inspecting aircraft as a younger man that light colors show up stress buckling and cracks developing many times better than black ever does.....

Mainly Red with Silver as the other main color, White lettering with Black shadow accents, and maybe a simple Italian Green pinstripe separating the main colors are what I have in mind right now ......

We'll see how all this will look in a few months,,,,

Robert in California

[dr j]

Robert,
That bike is looking great! I wish I could be there to hear it start up (with suitable hearing protection of course). Do you have a target date for its first event at El Mirage? Will you be running a front fender?

[smotorboy]

Hi There Dr J,
Good to hear from you...I expect to hear this thing fire up in late March or early April as I'm dealing with an Ignition system issue...I don't have one yet....
The OEM system is not viable due to the new Flywheel setup....So, I have a choice it seems,,,, buy a new Sach System or cobble together a "mono-buttock" setup from old worn out Ebay parts....Decisions must be made......

May 18-19 is the first event of the Year and I expect have her there and see just what I have wrought. It will most likely have a front fender as the dirt kicked up by the wheels at El Mirage can be a problem. However, it will not have the 80's style OEM fender as the style is just not correct for what I'm going for...

FYI for all that are interested, I have a lot of "low mileage" K-2 take-off parts that I'll be putting up for sale soon to help fund this project. Surprise ! I'm "over-budget" and it has yet to fire up ! I'm quite sure this has never happen before......

Robert in California

[Elby]

Hi,

Very nice project, if you wish a little advice then you need to make sure you have a stout fork brace. I built and entered the formula three Morini for the 1981 isle of man TT and we used a fibreglass front mudguard. The bike in first practice would set up a huge wobble at high speed. It was cured by fitting a strong fork brace. The mega phones look about right in size. The ignition on the morini was always a problem as it was difficult so set acrurately for each cylinder. I assume you are just going to run each distance and do not need the non maintainance of electronic ignition. We built a racer for short tracks and replaced the electronic system on that bike with the old style breaker points and condenser system. Using a stock coil for each cylinder we found it was more accurate to get each cylinder firing at its optimum timing. Very cheap as well.

Wish you luck with the project and I know only to well about running out of money on projects.

If you need any advice please ask.

Jonny

[smotorboy]

Thanks Jonny,
This is exactly the kind of info that I need right now. I've tossed the stock shimmy damper as It is worn and not very effective. I now have a Suzuki hydraulic unit in it place that I can really feel doing what it should...

As per your advice, I'm now going to fit a steel front fender I have that has built in fork bracing. I've been planing on a front fender to deal with the "kick-up" of dirt at El Mirage and salt-spray at Bonneville..

I ordered a Sachs Electronic ignition system last Thursday as it seems to have everything I need,,, several advance curves and two built in rev-limiters settings..

Not cheap, but well worth the price if it does things properly...

Backup plan is that I'll make a "dual-breaker point" system from scratch, and worry about timing advance later... We use to just fix the timing were it needed to be for best power on race motors,,, however that makes them a beast to start up with out any kind of retard/advance....

Keep up the advice,,,all is welcome
Robert in California

[Elby]

Hi Robert,

I found if you are bump starting the bike the fixed advance really is no problem, if you have the electronic system I am sure that is good to go. don't forget if you are just looking for top speed you need not even consider the advance curve. I assume advance is all done by 3,000 rpm most of the stocks were over and done with around 1500 rpm. Good to use the stock mudguard as apart from that the morini tracks true we did lengthen some swinging arms over the years by a couple of inches just to get away from slight high speed wobbles. I don't know what top speed you are hoping to get. Is it a flying mile? My Morini in the TT clocked 158 mph as a four hundred. Crankshafts are very weak at that sort of power so best to have spares.



Jonny

[stillooking]

[quote="Elby"] My Morini in the TT clocked 158 mph as a four hundred. /quote]

That is v.fast, great work; I can't imagine any other Morini 350 or 500 v-twin has got near that speed since?

Gareth

[smotorboy]

Jonny,,,
Wow ! What a bike you had,,, I understand why it was a tough go to get the motor to hold together all the way around the Isle of Mann circuit...

I'm not looking for anywhere near that kind of speed and power output,,, That is two-stroke Yamaha TZ350 territory you were equaling...Just incredible work...

I'm looking to get the Horsepower, at the wheel, into the 40's (with the blower) from it present 27/28 wheel horsepower. I'll be using the stock 8500 rpm redline for the time being, and maybe will up it to 9000 plus a little later on....This will keep the bottom end stress to a minimum.... Sky-High rpm's creates loads, friction, and stress way faster than anything else....

They measure the speed at the end of the 1.3 mile El Mirage course, and they measure the speed at the end of every mile on the 3 mile Bonneville "short-course".

I hope to get the bike into the 140's mph eventually using good aero fairings more than brute horsepower...

Bump starting is not a good choice as the bike's steering is so rules limited that wobbling around will not work very well...Plus, I'll be in a starting Que with no room...

Kick starter, Removable electric starter engaging the C/S, or powered wheel rollers are my choices. Kick starting is what I'm going the try as I've reduced the Compression to 8.6 so with a retard-able ignition and good cylinder fuel priming it should work ok...
The timing advance is usually all in by 6000 rpm and it is at TDC at starting...

What fairing were you using on that rocket bike you had...It had to have great aerodynamics...

Regards and keep the info coming,
Robert in California