Rotary Owners' Club

Hi Dell Boy,Ych 110Y had already been back to the factory with engine problems, twice. In Nov 1983 at approx 7,000 miles then again in Oct 1984 when it came in 'ringing' as a broken housing stud was hitting the back of the flywheel. After this it was converted to twin rotor idle and the 6mm studs re...

Just a thought as I am with Graham on the amount of air cooled that dont smear compared to the amount of water cooled that do;ie none of Derbyshire air cooled smeared but all but one water cooled did, often many times.As one of the main differences between the two engines is the running tolerances b...

That fits in with the rich mixtures found on the 25 or so police bikes I looked after. After a few thousand miles, the blanking (tamper proof) plugs were removed from covering the mixture screws and the mixtures were then set asper workshop manual. This involved setting the bike to run on one rotor ...

I am after a rear blue beacon to fit an IP2 if anyone has one.Malc

Forum member and friend with the well used Classic is having a big operation next week so I hope other members may also like to take the opportunity to wish him well and make a speedy recovery in time for the better weather.Best Wishes John.Malc

Go on Russ, They are very underrated and 3K is about right for that model.I still have 3 of them, one I have had for 43 years and another for 23 years. Good ones last a long time. The oil in frame model can have a leak around the main frame/oil tank /rear engine mount area and many have had weld rep...

Hi David,I am sorry to disappoint you but the Commander owner who took a footrest hanger a few years back almost certainly was an ROC member. I had met him at an ROC meeting. On this latter occasion, almost certainly not and during the brief conversation with him, the forum was not mentioned and had...

Not quite sure of your point here David.I am not an ROC member now, (nor of the other clubs I was a member of) but that does not make me less honest than if I was still a member.There are bad apples in all walks of life but it is easy to think that people with the same interests as oneself are alway...

Thank you for your posts of support. I am pleased to say that either by coincidence or the power of the forum, the said item was returned to me this morning.I had an 'odd' phone call Thurs which roughly went that he had tried the item I had lent to him??????? and it cured the problem and was it for ...

JUST A WORD OF CAUTION, I CAN CONFIRM THAT FOR THE SECOND TIME ( THE FIRST TIME A FEW YEARS AGO) I HAVE HAD AN ITEM 'DISSAPEAR' FROM MY GARAGE AFTER LETTING SOMEONE VIEW MY BIKE.I HAVE WAITED A WHILE TO DOUBLE , TREBLE AND RE-CHECK AGAIN AND AGAIN AS THE PERSON APPEARS VERY TRUSTING, BUT NO, IT HAS ...

3016 sounds right from memory, I didn't log the frame/ engine numbers until a few years later when there was a problem.The first Derbyshire bike that went for auction was the Derby city bike YCH 107Y. It went for sale at Measham in the midlands and made daft money. I had the day off work to go and b...

Hi Steffen,Good to see some 'young blood' riding these old bikes.Dell Boy, your reference to YCH 110Y,That was a Derbyshire bike, The first reference I still have of it (some pages missing out my book) was 03/11/1983 when it had 6,909 miles on it. It was based at Matlock and had a 'hard' rider on it...

Gripper, the bike runs 17 inch wheels which meant raising the footrests a bit more but it 'rolls' into corners more like a modern bike but has less feel than the red bike on std wheels with dunlop race crossplys.While I have not been able to ride I have let a number of other riders use the bikes and...

Mines probably not an Aurora tank then. Cant get to it to check or photograph it or even the spare which is boxed up with a set of Suzuki side panels cut down to fit around the SU carbs.The underside is the same as Ash's but from memory, one of the tanks has the anit explosive mesh inside so could b...

I have run 2 track bikes with different exhausts and SU carbs. All the adjustment is on the needle taper and jet height adjustment.For track use, I have been able to adjust them very well but as they are revving higher than they would in road use, it is harder to comment on how the 'driveabilty' wou...

Aug 08 030.jpg Fitted this Aurora petrol tank to this bike. The problem was getting a seat to match in with the contour of the tank and then making the oil tank accessible.Tried the suzuki seat and then had to fit a rail on the frame to mount the hinges. Had to modify the frame to take the tank as ...

Yes, thats the gearbox plate that matches up to the R/H end plate i imagined I had!

exactly why I have no interest at looking at bikes at shows and also why I have never released any pictures of the RC588 I have had for 20 years.As I can't ride it, I sounded out a prospective rider but he wasn't as enthusiastic when i told him it would run with Kawasaki bodywork and he wasn't to le...

Hi David,It is in fact a Yamaha YZF 750, The company buys and converts these bikes to replicate the JPS Norton.There was a 2 page article and test in MCN OCT 10th.That was the reason for the previous ad of YZF750 Norton lookalike. I have a YZF ready for converting if someone would want to. I definat...

The standard IP2 uses (or used) Champion UG80 PV as these surface discharge plugs are less prone to fouling and there is no earth electrode to burn off with excess heat.I used these in my track bikes over the years with no problem and they have lasted well, BUT, because of the excess oil used, I kee...

Did have one Commander with a brake noise although none of the others all running original yamaha pads were noisy.The problem was that one caliper bolt appeared to be torqued up correctly but in fact the bolt was 'tight' on the original loctite but not tight enough to stop some resonance when the br...

Dont want to upset you john, but UCL wont repair an engine problem.The factory at Shenstone would tell me to put UCL down the plug holes every time I would ring with another engine problem during the 3 year warranty on the police bikes. After following their advice on several occasions to use the UC...

To the people who may have seen the ads for the imitation 'Norton' based on the Yamaha YZF750, should anyone want a base bike to convert, I have anoriginal 1993 YZF750 which I may sell.It is in its original colour with 38,000 miles on the clock and is very clean for its age. It is all standard, incl...

Russ, That system is before my time! I only started working on Police bikes back in 1983, Just in time for the first Nortons.I remember about 4 types of flasher unit, some had a separate aux connection which (from memory) gave an output opposite to when the flasher unit was on. If this was connected...

Richard,FZR 250 tacho, Have 3, but are attached to my bikes, These are the 2KR models that only rev to 17,000 not the 3LN models that rev to 18500. I like these little engines, both models produced 45 bhp but to get the 3LN model to rev higher, Yamaha fitted con rods 2mm longer and reduced the deck ...

This is probably of no help, but all the police 2 tone horns I have fitted to early BMWs and Nortons were of the type operated by compressed air with 2 separate air pipes which supplied either 2 horns on the BMWs and the combined double sided horn on the Nortons. At the time, these were supplied by ...

Russ,I only know this because in the mid-eighties I was having time out for teacher training at college and so the force asked if I would do a half day on the traffic patrol course specifically to cover motor-cycle issues.At least the lads on the college courses behaved!

Tyres, Radials and crossplies cannot be mixed on the same axle on cars because the flex of the sidewall is different and so alters the tyre's footprint. This can alter the handling of the car and make it dangerous.The sidewalls on crossplies have cords at 90 degrees as the name implies but these pli...

Hi Mike, Groat,Interesting you should have had new Bosch plugs fail. While maintaing a fleet of police bikes, a problem occured with the K series BMWs that was down to the new Bosch plugs fitted during a service, breaking down almost immediately, if not within the first hundred miles. This happened ...

This would seem an excellent solution to an IP2 that I came across. Due to the L/H rotor getting all that extra oil and the poor R/H rotor getting less, the owner had a screen washer bottle complete with pump fitted in the right side of fairing compartment.This was full of 'extra' comp 2 and plumbed...