Brad The Bike Boy: May 2023

DS version of the 2V Cam profile comparison -> Click here for link using the same rig as previously modified very slightly to take the M659 head. And prompting me to buy a new degree wheel.

The DS cams I have to hand are the M659/696/796 8P and the 1100Evo 10B. George at D Moto sent me a pair of 3V, which are the early 1000 cams. The later 1000 cams are 7V, and i believe there must also be another version as there are still 3 active # numbers for 1000/1100 cams with the same specs, and one superceded.

The physical difference in the cams from early to late is the large bearing journal on the LH end. On the later cams it is narrower and further out, and requires a different cam end cap. As below. 10B on left, 3V on right.

The specs as per the manuals, etc and as measured as below. I don't have any of the bottom 3 cams to check for now.

I suspect that the 8P and 3V are the same profiles, with the lobe separation opened up (less overlap) for the bigger 1000/1100 engines. The Evo cam is quite a bit bigger.

Comparing all:

The 8P and 3V.

And the 3V and 10B, showing how much bigger the Evo's 10B is.

The 851

The 400SS

I bought this 400SS (genuine 93 model Australian delivery! Woo hoo huh.) after seeing it in Ebay for what was possibly an good price. As ever, good was too good to be true. Badly repaired and rusted out fuel tank, badly repainted side panels, lots of km (83,000 of the bastards), etc. You know, the usual. Purchased in October 2012, as of now (Jan 2014) I've nearly finished a major service. The cam timing is done with some of the Madasl adjustable pullies that have been drilled in 4 different settings for easy dyno testing. And I have some 900 headers to try a 40mm dual exhaust set up on it (ala M400). Not a great deal of progress for 15 months, so it's taking on a long term feel. There's an F1 endurance style seat base (more taper at the rear) and front fairing sitting around, which will require frame mods to fit. It's a bit of a mental sticking point as this time. But hey, it's not like I can devalue it much more.

The Mighty KR1S 250

How it looked the rainy night someone came to take it away. Painted all black when I bought it, at some point later I realised i could rub the black off and have much of the original colour scheme underneath. Although the main fairing was originally from a red KR1 I think, and definitely badly repaired more than once, so it stayed black. And the tail panel shown was bought to replace the one I smashed the only time I crashed it and the last time I rode it at a Sandown track day. A sensational little bike, holed pistons and frequently failing stator windings aside. The first bike I rode on a race track and the first bike I had my knee down on. And a great commuter too I found. It's sometimes nice to have a bike that won't wheelie past the city speed limit in first gear.

Brad The Bike Boy

Monday, May 1, 2023

Index - of sorts anyway. Think of it as a guide.

Marzocchi 40mm fork design and impact of oil level on spring rate, Part 3: The crap ones

Ducati DS Cam profile comparison