The changes I made on the sunburst

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20M3 commando no script 68-70 partial

20M3S commando Script 1. 69-70 "S" 2. 70 roadster 3. later 70 fastback
 
Yves, you have now ridden a superbly developed 920 and an expertly built 750. Both in similarly lightweight chassis.

Can you please give us your insights into what they are like and what the differences are?
 
Fast Eddie said:
Yves, you have now ridden a superbly developed 920 and an expertly built 750. Both in similarly lightweight chassis.

Can you please give us your insights into what they are like and what the differences are?
Click to expand...
NEW THREAD!

NEW THREAD!

(it's the meds, that's my excuse)
 
Fast Eddie said:
Yves, you have now ridden a superbly developed 920 and an expertly built 750. Both in similarly lightweight chassis.

Can you please give us your insights into what they are like and what the differences are?
Click to expand...
Difficult to explain: they are two very diferent bikes, the 920 was very hight tuned, Fullauto head, Maney cylinder and cases with re-angled big valves by Klaus, flowed head by Werner, one piece billet crank from Jim Schmidt, JS 2 smootramp camshaft, BSA followers, beehive springs, hight compression pistons, Keihin FCR 35 carbs from Matt, Trispark ignition, TTI gearbox 5 speed and more.
It was a lot of work to have everithing working wel. I receive a lot of help from the access members
But at the end the bike was flying wit a lot of bottom power, in fact power from 1200 to 7000 rpm.
I give the Big Spender for testing, Jagbruno was the man in charge, after the test he says that when he take his own 850 to ride home, he gat the feeling that his bike was runing on one cylinder.
The problem was the head gasket, always blowing away, I was underway to solve the problem till Calamity Jane cross my way and destroy the Seeley and my self....
BTW the Seeley Mk 3 frame as a ladder to.
But believe me, I will never forget the post combustion feeling from the 920 Big Spender, never....

The Sunburst now:
A 750 wit all the good components as a describe in this tread, the engine is still like Kenny Cumings made it, but the power is not to compare with the 920, less bottom power, you must go high in the rev to feel the power, but the engine give me no issues so far.
But I miss something on this bike. Depending from the money I will receive from the insurance, I have a plan A and a plan B for the engine, I keep it secret so far, but I never go back to the same tuning as on the Big Spender.

About the frames: the road holding are similar, The big Spender was a Mk3, the Sunburst is a Mk2.
To me the Mk2 frame is better for a Commando engine, the engine is better in the frame, more points to hold the engine in the frame.
Now that I am disabled, I always need someone to push the bike backwards when needed, all the guys that did it says: so light, its like a bicycle.

Tomorow I will start a new tread about the striping of the Sunburst, Hope you will enjoy it
Yves
 
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