stroker crazy

A fairly important component! Stroked 4mm to 58mm; re-balanced to suit the Wössner 73mm pistons; PEEK coated big-end bearing cages and thrust washers: Tungsten alloy counterweights: Crazy

No progress on the DT tear-down over Christmas - I've been side-tracked by making a fairing for the 'Ace'. However the parts collection continues - A new can to replace the ugly, restrictive, and heavy original; First three oversizes (just in case!): Crazy

Yes, but there is method in my madness! Crazy

Some new clutch parts: plus: and: Crazy

Previous post was in answer to comments (above) by wild foamy and don't make sense out of context. Crazy

Apologies if my post was responsible for causing excessive arousal! You can imagine how I felt when I first laid eyes on it. Clearance is tight but it will be OK. With the fork springs removed and forks compressed there is about 10mm clearance at full lock. Maximum dive at full lock is not a situation I would like to find myself in! Crazy

Wide tune and PV for me! My tolerance for bad frights has diminished with age. Crazy

Chambers won't be ready before the new year but they are looking beautiful so far. I will be able to retain the centre stand and have enough clearance to fit 18 inch wheels: Well worth waiting for! Crazy

Airhead - the pump is from another bike, the bike is currently running on pre-mix. I will be checking the replacement pump and replacing whatever might be necessary. Crazy

I hope to make a start on dismantling the DT over Christmas. In the meantime I've been collecting parts. NOS cylinder fin dampeners: Replacement reeds: Crazy

dt502001 - There are many options from CPI (and others) for building large capacity twins on Banshee cases but there is a snag when using for a bike rather than for an ATV. They mostly have no power-valve system. This results in a sluggish mid-range with a sudden, vicious rush of power at the top. Some can be set up with a vacuum operated, guillotine-type power valve but this makes matters worse as they have a time-lag between throttle movement and valve operation. This can be tolerated with an ATV or a drag bike but would make a bike super difficult to ride. I'm not much interested in Hp numbers as such, as I am aiming for as wide a power delivery as possible and not a narrow peak kind of motor. That said, I would be surprised and somewhat disappointed if something in the vicinity of 90 Hp wasn't achieved. New cranks are available from several sources but it is most critical that they are set up perfectly and are modified to achieve the best balance possible. I will post more on crank issues if you want but it will take some time before I can ferret through my files. Crazy

It's good to see another old DT being revived! Whatever the capacity they're more fun than a barrel of monkeys. Crazy

AndtDtr08 - CP Industries manufacture monoblocks in a range of bore/stroke combinations for the ATV crowd in the USofA: http://www.cpindinc.com/ dt502001 - The extra 4mm stroke (to 58mm) with the 73mm bore gives 485cc. I don't think Banshee cases have any particular advantage; I just didn't want to risk building this rather extreme motor on second-hand cases. The power valve is still being developed, but it is a throttle controlled blade type. There are still some detail design issues to resolve, but the direction ahead is (mostly!) known. Thanks for your interest, Crazy

AndyDtr08 - undergoing a bit of a hiatus with the RaZoR at the moment as the engineer building the chambers has possession of the interesting bits! The photo below gives an indication of where I'm heading. It shows the frame (before additions) with crankcase, barrels, etc., fitted to check clearances. The cases are from Banshee machined to accept Calvin Pollet barrels with a 73mm bore. The carbies are Keihin FCRs. The crank being fitted has been stroked 4mm. Crazy

The damper works really well because it has three different adjustment to tailor its response to your requirements. Crazy

The runner doesn't have a functioning oil pump and is running on pre-mix. An unsatisfactory arrangement in my opinion; fortunately I've managed to find a second hand pump to refurbish: Crazy

Tower welded to frame for Scott's steering damper: Top fork yoke counterbored for mounting bracket: Crazy

Are you thinking of Kenny's demonstration at the 2009 Indy Mile? I had to laugh when he said: "...... they never paid me enough then (1975) to ride it, now they don't pay me nothing, so that's really working my way backwards......." Crazy

I've been collecting parts for a while; the only major parts outstanding are the chambers and a radiator. With a bit of luck the chambers will arrive before the new year and I'll be able to start on the body work.. Crazy

drewpy - K.R. might not agree with you on that. His comments on their unrideability would be enough to scare me off. Crazy

I have a couple of projects running simultaneously but the RaZoR is the main show. Other projects are mainly to relieve the frustration when this build is stalled. Back in the day I was seduced from the four-stroke mainstream by LC and then RZ Yamahas. I followed on with later iterations of Yamaha's two-stroke, twin cylinder offerings but the '83 RZeds are my alltime favourite bike. Exciting to ride, simple to work on - what more does anyone need? It turns out that what you want can become more important than needs. To that end I have started to build my ultimate homage to the RZ. Same looks, but tidied up some, and more horsepower. The starting point: This discarded: A few additions made to give this: The plan is to add a motor to this, based on new Banshee cases, stroked and bored as far as the cases will allow. Whether my ambitions for this bike are beyond my capacities only time will tell! Crazy

Thanks guys - I didn't think anything was available after all this time. Aiming to get something made similar to ths: If it's good enough for K.R. it's more than good enough for me! Crazy

Thanks drewpy! Crazy

I've been trying to add information to my DT400 thread but the options area is greyed and posts don't happen. What am I doing wrong? Crazy

Does anyone know of an aftermarket pipe for the 400? Crazy