Archive for the ‘rephase’ Tag

XS650: Daryl Rephase   Leave a comment

Mr Rephase and the media circus. Interesting article. Motorcycle Trader. June 2014.

Daryl Rephase XS650

Daryl, Professional Motorcycle Tuning, Melbourne, Australia … 270° XS650 Rephase

 

Daryl Rephase XS650

also read: …. Professional Motorcycle Tuning

Posted June 25, 2014 by xscafe in Motor - Crank

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XS650: Professional Motorcycle Tuning, Australia   Leave a comment

DARYL, PMT, MELBOURNE

My first contact with Daryl was back when I joined the Australian XS650 Club. After finding Terry’s website. I had picked up an XS650 Special for a song. Had been sitting 10 years. Reigniting an association I had had with these beauties during the 70’s and 80’s. Funny how the worm turns. Connects.

Was talking to a mate about my find. A warm far-away smile spreads across his face. Takes me out to one of his sheds. An 82 standard sitting in the corner. Sharing space with other beauties he hadn’t been able to part with. Naya, to cut a long story short – I started telling him about Daryl’s 270° rephase pins. We spent the next few weeks ‘touring’ around Europe (touring? – hmmm, hard physical work, long days, hotel beds – a dream). Boys back in town. Peter hands me a small package. Surprisingly heavy. You got it! 270 heaven. No looking back now. I’m converted. Wanted to do some remedial revision last year, to the 270 motor: clutch, gearbox, cam chain and a little headwork – ended up adding a 750 kit too. Checked the crank – no problems. Still, I added carrillo rods, balanced and welded it all together. Mum shat buckets of blood.

270° pins

270° rephase pins

 

This isn’t my story, so back to the point.

Daryl isn’t just Mr 270. He is Professional Motorcycle Tuning. Melbourne (a truly beautiful town, Port Phillip, Yarra River, AFL and the nearby Phillip Island circuit to name just a few teasers – well worth a visit).

Where to start ? At the beginning.

First ride on a motorcycle:  within a week of my 10th birthday, May 1970. I said there and then that I want to be around them for the rest of my life!!!! I am now 50+ young

I have, luckily enough, been able to do this most of the time. I moved to Melbourne, 1978. Worked as an apprentice electrician. I didn’t really like it. Spent most of my time at a mates motorcycle shop, helping. How I got my first XS650.

An XS2. In a million bits. All in boxes. Engine totally dismantled.Forks removed, swing arm in another box. But, everything was there. Over the next few months we rebuilt the engine, installed the forks and swing arm, some new tyres, got some replica Dunstall mufflers and another mate painted thetin. Cool looking wheels.

 I rode that bike around Melbourne. Did a trip up to Sydney and back. Never missed a beat. I came out from my electrical job one afternoon and it was gone. I thought the guys I worked with might have moved it on me as a joke, but no, it was stolen. Called the police. They didn’t really care. Never found it. Only had one photo of it – long lost. I really liked that bike.

 After finishing my apprenticeship, 4 years, I joined the army for 3 years.  Since then, I have been involved in the motorcycle industry, working as a mechanic until becoming the service manager at Raceway Suzuki, owned and run by the guy that helped me build that very first XS650. Small world.

Took an offer, 2000, to join the official Australian Suzuki superbike team as a mechanic, boring job, pull one engine out, put another one in. That was thelast year that we ran full spec FIM superbikes down here. All came straight from the factory. Got to look at the inside of one. It was not a 750cc engine.750cc was the limit. I know how big a 750 piston is. This was way bigger. Factory tricks. A mate working on the Yamaha team told me they had “fat” engines as well. How can privateer do battle with that??!!

 Season finished. We won the championship. No job. Tried working at a Ducati dealership. Didn’t “fit” into the Ducati thing and left after 3 months.

 What to do now? Start my own shop. Professional Motorcycle Tuning. I opened 1st Feb 2001. Best thing I ever did !

PMT workshop, Melbourne … a city definitely worth visiting

 

I have owned XS650s for most of the time, all roadster types (447), I don’t really like the special version. Too american for me. But hey, they pay the bills.

I started doing a few engine rebuilds for a few people put ting a few of my little tricks into them. Word spread of what I can do. Terry (Toota) used to get the rephased pins done but his engineer retired, so now I do them. I am the only place in the world where they are available.

 I always have 2-3 XS650 engine rebuilds on the go. They vary from stock rebuild to big bore rephase and everything in between. XS1 is my favorite engine to do. Stronger cases, taller 1st gear and the head, all valve inspection covers the same. 3 bolt. Some people think it is a head off something else. I am working one at the moment that is being de-stroked 6mm, down to 62mm, 256 conrods bushed to 20mm and an 81mm bore. 640cc.Rephased, what else? Got some titanium valves on the way from USA. Still waiting. Special cam, my dry clutch and high ratio primary gears. XS1 gearbox.

If my math is right it should be able to spin to 10,500-11,000 RPM, piston speed 22m/sec. Bee-hive valve springs. Not that all hard to do, the secret is in the set-up.And the best bit, most of the parts are available across the counter. The guy that does my head porting is a whizz!

Now, my awesome tracker is on the back burner for a while. Too much customer work on the go at the moment and I have my TX750s to play with.

One thing I have been working on is an XS650 dry clutch. Just about got it done. After I do some testing (race track) on it I might start to do kits, costing ?? $3000-$4000.No one else does them. Someone in Japan does a kit for the SR500 every now and then. They areall sold out not long after being put on sale and they are a similar price.

 What else?? Yes, my belt drive. I am doing one for a customer at the moment. He now wants to fit a Motolana swingarm, 25+mm shorter than stock. I can’t cut and join a belt. Yet! Another spanner in the works. And he wants his stock one braced. A removable partwill have to be put in the bracing. I can do it. I can do anything. The belt drive? About $1000. Belts on Harleys last tens of thousands of kms so I can’t see a problem. I used to look after an XV1600A that in 100,000 km had only one adjustment.

I have been working on a light-weight charging system.It will also incorporate an ignition for all styles of engine, std, 277° or 270° crank, as required. As the cam chain stretches the ignition timing changes.With my system it is truly set and forget. But more on that later, no price yet but it will be reasonable for what you get

Some of Daryl’s builds:

the street scrambler

750cc, 270 deg crank, Probe ignition, 34mm Mikuni carbs, TRX850 front end, Motolana SR500 swing arm, SR500 fuel tank, SR500 Nitroheads seat, and a lot of over the counter parts.

street scrambler

 

the bobber

750cc, 270 degree crank, 34mm Mikuni carbs, Pamco ignition, header pipes that are way too big and loud (what the owner wanted) and extended swing arm.

bobber

 

the green machine

Total rebuild using mostly after-market parts, 650cc, std crank, 75 done up like a 74.

the green machine

 

all 3

all 3

 

clean canvas

every rebuild starts like this – all threads chased/helicoiled

 

barrels,

My 840cc piston with barrels, 85mm bore compared to Heiden’s 750cc barrels. My piston assembly is about 50 gram lighter.

840 barrels and pistons sitting beside a heidens 750 kit

 

Daryl and his tracker

Daryl and his tracker – when will you get time to finish it?

 

Looking good mate ……..

Daryl Hutcheon … Professional Motorcycle Tuning, Melbourne

Tel: Int’l- ++61 3 9330 4909 ………. Aus: (03 – 9330-4909)

Fax: Int’l- ++61 3 9330 4903 ……… Aus: (03 – 9330-4903)

Mob: Int’l ++61 409 164 274 ……… Aus: (0409-164 274)

Email: – promctun@bigpond.net.au

XS650: Rephase   3 comments

I first heard whispers about rephasing listening to my older cousins discuss how they could improve their old Triumph race bikes. There are long discussions over at the brit forums.

Then I forgot all about it.

Some years ago I bought an old Special from a bloke in the Hunsrück. Don’t really know why. On a whim. An ebay joke-bid. Low kms. Clean. Been sitting for some years . MMM. As usual. The missus wasn’t happy. As usual.. And it sat. As usual.

Then I put my back out. Time on my hands. Found the aussie 650 site. Yes Terry, I know. You didn’t force me to read. And it got me off my arse. Actually I like the Yamahas. The only new bike I’ve ever bought was a ’77 XT500. My daily rides are my SR500 and SRX600. Growing up with British bikes you learn to think that‘s all there is. Later I was introduced to Italian bikes, falling in love with a ’75 Ducati 750. And with Guzzi Le Mans. They all, however, share one thing in common. They’re Thumpers.

Anyway reading that site opened my eyes to the versatilty of these bikes, and reintroduced me to rephasing. This little gif said it all.

 

360° crank

 

270° crank

 

Changing the crank set up so the pistons dont travel together. Rephasing doesn’t so much give a power increase. Rather it uses the existing power more efficiently. The torque wasted overcoming the inertia of having both pistons stationary at TDC and BDC is made useable

  • power saving
  • less vibration, the motor runs smoother
  • better responsiveness
  • slightly torquier
  • if you do this weld the pins to the flywheels…balancing helps too

 

split crank…you want another #2 disc

 

and one of these 90° offset centre pins

 

#2 disc modified…dont forget to renotch for the cam chain gear locator … this is only necessary when doing a 277° rephase as the sprocket is relocated onto the splined rephasing shaft for a 270° and is positioned properly when re installed

 

to be assembled so

 

and so

 

to look like this

 

so right leads left…makes timing easier as you can use the original marks

 

tolerances

 

tolerances

 

mmm

 

There are 2 ways of doing this
277°

  • split the crank at the centrepin-rotate the right hand side 3 splines and press back together…277° rephase

270°

  • split the crank, replace the 2nd flywheel from the right with a slightly modified 3rd flywheel (remove 7mm from the pin boss where the cam sprocket seats … Distance between centre flywheels is 54mm, unmodified flywheel is 25mm cam sprocket is 11mm leaving 18mm for the modified flywheel therefore 7mm is removed. This just happens to be from the end of the bearing mounting section to the bottom of the circlip groove.), use a 270° pin and press together 90° out of phase…270° rephase.

Was talking with Heiden a while ago. They were tying to explain their new method. I couldn’t exactly understand what was being said. What I did get was that they use an offset pin…do the 277° swap and a 3° offset pin to get the rest. Saves sourcing and machining the other crank disc.

These require a suitably modified camshaft and ignition system…a good time to consider installing a permanant magnet alternator. Originally I used a modified points plate

Yamaha missed a golden opportunity to produce a truly extraordinary motor by turning this idea down. Todays TDM.

Anyone interested in spending the effort wont be disappointed. Virtually all modern-day parallel twins are built this way.

Last time I went home I took with me the bits necessary to do this. Airport security and check-in were not happy. Complete 533 crank. Already set-up. Back home we get 447 motors. Rephased 256 cam. That hurt, I had around 8 or 9 of these. All got destroyed trying to weld them together. Except for that last one. What a waste. And a modified points plate. Fortunately I had my 2 year old with me and got to use his baggage allowance too.

My initial test ride was the Scenic Drive. This winds its’ way along the Waitakere Ranges west of Auckland, separating it from the west coast. A nice ride. Couldn’t get the smile off my face. Had to turn around and run again. This time taking the Piha Kare Kare road. To the beaches. In the old days this used to be gravel. Great for testing. What a blast. Couldn’t stop. Back. To Huia and Whatipu. Then. Shot across the city. South and East. Through Kawakawa Bay, Orere, down the Kaiaua Coast road, stopping for fish and chips at my cousins. And along the Coromandel Coast Road to the commune at Coro. There I changed the oil, got super wasted and spent the night. Next day across the Hauraki Plains, out to Port Waikato and down the back way to Raglan. Then time to go home. Had forgotten my poor son. Although he was with my family he doesn’t speak english. He was not happy. Ouch.

I was converted. My son was concerned.

Bits can be sourced from Daryl promctun@bigpond.net.au ph: aus 03-9330-4909 …  and Heiden -not on their site-u need to ask for these

Webcam will regrind your stock cam to any of their profiles, and for a rephase motor. Megacycle will do this too, they need to know which piston you lead with & what profile you want. See Heiden also for billet cams. If anyone in kiwiland is reading, contact orb, he will point you to a grinder.

The crank was split and reassembled using a press. Safe. Controlled. I have seen photos where this has been done on the garage floor. It can be done. I’ve seen similar in Africa, Sth America, Asia, India etc.

Don’t know about you. But. I like my eyes.

 

if these get loose i dont want to be in the way

 

there are parts of me that wish i’d never seen these 2 photos..hugh says ..’The 2 picture you posted of a crank being split and pressed together are mine. I did that several years ago when no one else in the US was willing to build a crank for me, nor had anyone had any real experience doing so that they wanted to share. Low budget, and not a highly recommended method, but it worked and has worked for over 10,000 miles now. I do recommend welding the crank at all pressed joints though, as they tend to seperate at high rpm’s.’

 

Vibration was noticeably less. Was not an XS any more. Neither sounded nor responded the same.  Begged to be cut loose. Yamaduc.

Generally crank vibration depends on such-like: balance factor, stroke and rod ratio. She will run smoother the closer you get to a balance factor of 50 to 53%. I didn’t balance mine. Pressed her together. Mic’d her up and slammed her gently into the cases. Ride.

I want to do this to my ride here too. Wont tell the wife unless she notices. Time to start collecting the bits again. This will complement the 750 well.

Interesting. Was talking to Jerry Heiden this morning. Was saying he doesnt like, or more to the point, is not as fond of the 270° conversion. Too time consuming for the extra gain? Says he has been having problems matching crank parts. Seems there are variations in castings and machining between the years. Puts the balance out. To minimise the problems you need to get the extra crank parts from a machine as close as possible to your production run/engine nr. All for only a 2% gain. Or stick to a 277° rephase. He welds them up. But not fully. 2 x 1cm tab welds. Makes it easier to resplit.

Posted January 25, 2011 by xscafe in Frame - Handling, Motor - Cam, Motor - Crank

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