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Post by mizztah on Aug 7, 2009 8:34:48 GMT
Hi After much searching I came to the conclusion that a Divvie 600 would be the best bet for my son to use for the last year of his 2 year 33bhp stint. After trying to fathom the ins and outs of restricted bikes regarding insurance & the law it seems that you do not have to provide evidence to most insurance companies to prove a machine has been restricted so the requirement to have a certificate to prove restriction isn't a legal requirement. So I now need to restrict his Divvie down to 33bhp. Has anyone a power graph out there? The simplest way I can think off is to manufacturer an adjustable stop(same as the tickover screw setup) but preventing the cable drum on the carbs turning through it's complete rotation of travel. If I use an adjuster I'm hopeful I can take it to nearest rolling road to set it up exactly(if I can see a graph first gives me an idea of the max rpm to be used). Has anyone else used this route? Alternatively does anyone have a restrictor kit they want to sell !  cheers Mizztah |
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Post by CD on Aug 7, 2009 10:09:34 GMT
Metalforever has restricted his D6 and might be able to help.
It's done with restrictor plates (like washers) between the carburettor manifold rubbers and the cyl head. Easy enough to fit or remove but does make me wonder how would they know its been restricted.
Dave
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Post by amorti on Aug 7, 2009 17:02:14 GMT
They know when you drive it into a car / hedge / house / kitten, take the bike away, and look for the restrictors which aren't there  Best route is to get the dimensions of the plates off another member, and have a set made. There was a thread somewhere that someone found a set in his bike and was a bit surprised. don't know who though. |
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Post by mizztah on Aug 7, 2009 19:39:15 GMT
Made some phone calls today..Fowlers in Bristol said there is a 33bhp kit listed for the Div but they can only sell it to a dealer as there is paperwork with it that has to be returned to them - I think that the dealer must fit the kit.
In the forum I've seen a pic of some white plastic thingies that someone found in their carbs - I'm quite sure thay are going to be the Yam ones as they cost £50ish.
Regarding proving your bike is 33bhp there doesn't seem to be any hard and fast rules. My(knowlegable) Insurance broker had a chat with some underwriters for me and the Insurers he spoke to said they do not want any paperwork to show it is restricted. In the event of a mishap and the power output is brought into question they will investigate and the first line is a dyno if possible. By and large this is what the Police will do.
A work collegue passed his test a couple of years ago and brought a ZX6, derestricted 2 weeks later then promptly dropped it big style and had to be airlifted to hospital in a bad way. No-one ever looked into it but then he didn't croak it & nobody other than him got hurt.
So I think we'll look into the Yam kit!
cheers
MizztaH
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Post by General Gman on Aug 8, 2009 8:30:21 GMT
I would be extremely surprised if an insurance engineer took the carbs apart to check if restrictors were in place.
Like you say, there is no need for any certification at all - you can just tell them it's restricted.
TBH, restricting the divvy probably won't make a great deal of difference in day to day riding anyway.
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Post by jockyT on Aug 8, 2009 17:03:36 GMT
The 600 restictor kit from Yamaha (KIT XJ6SN-25-96) comprises of 4 off carb slide restrictors. These are not washers. They are each two part assemblies that fit either end of the diaghram spring. I paid £200 fitted from a dealer 6 weeks less than 2 years ago I have a sketch showing the parts but it's not dimensioned. Regarding insurance etc, I declared my bike as modified and wasn't required to send proof of restriction. It is, however, a condition of your licence and therefore a legal requirement. To ride an unrestircted bike is simply riding wthout a licence and presumably insurance. First thing to be looked at in the event of an accident is your licence and that will lead to the bike being checked. 33hp is plenty for a new and inexperienced rider and to be honest I'm not expecting much more from my 600 when the restrictors come out. John |
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Post by teejayexc on Aug 8, 2009 20:02:51 GMT
Regarding insurance etc, I declared my bike as modified and wasn't required to send proof of restriction. It is, however, a condition of your licence and therefore a legal requirement. To ride an unrestircted bike is simply riding wthout a licence and presumably insurance. First thing to be looked at in the event of an accident is your licence and that will lead to the bike being checked. 33hp is plenty for a new and inexperienced rider and to be honest I'm not expecting much more from my 600 when the restrictors come out. John Well said that man, if it wasn't a legal necessity what would be the point of having a restriction class on your licence? 9 times out of 10 you may get away with it, but if the sh1t hit the fan it's the first thing the insurance and police would look at. |
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Post by CD on Aug 10, 2009 8:44:44 GMT
The 600 will feel lots better without the restrictors as power will almost double. From what I understand the restricted bike has minimal overtaking ability as the engine wont rev. That *should* stop riders doing silly things.
I used an MZ 250 for quite a while. Only 22bhp but much lighter weight so maybe not that much slower than a restricted D6. Overtaking was hopless if cars were doing more than 40. But it did teach me a smooth riding style. I couldnt blast along straights brake hard for bends then blast along again. So I got good at smooth riding reading the road and maintaining my speed through bends.
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Post by jockyT on Aug 10, 2009 19:18:33 GMT
I'm going to do some checks before I remove them. 30-50, 40-60, 50-70 in 3rd, 4th, 5th - that sort of thing.
I'm sure that acceleration for overtakes is affected most but I'll post up a comparison for anyone interested.
John
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Post by pilgrim on Aug 14, 2009 21:49:18 GMT
jockyT, you've a PM........
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Post by jockyT on Oct 9, 2009 20:13:03 GMT
Well I didn't get round to doing any tests before removing the restrictors but the bike feels generally more responsive - surprise surprise.
Anyway, I now have a restrictor kit for sale, if you know anyone who's after one. It is an official Yamaha kit with various documents and a certificate.
My bike ran very well restricted with no rough running or flat spots so I'd recommend this kit for the job.
pm for more details.
John
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