So before spending all the money, do as Gnasher suggested and give Yamaha a call to check the emission figure for your bike, if its under 0.15 then all it will cost you is £60 for a Certificate of conformity which you then upload along with a copy of the first page of your V5 on the TFL website -
But (as I said) Yamaha will give you a figure which is over the limit. Been there, done that.
NOX figures were only entered onto V5s later, so only the manufacturer can provide an official figure.
Of course individual bikes might give a lower NOX figure, especially if the mixture has been adjusted, such as with a non OE air filter. But then you need it individually tested, and for that you are at the mercy of the only approved testing workshop..... who have you by the short and curlies
When I contacted Yamaha about my 600 they said they couldn't give any figures as the bike was manufactured before testing began which at first I thought it strange since it's the same year as my thou But I figure tests would be carried out on the first batch of a new models which the 600 was 1998? and the thou 2001?
My 2000 FZS 600 level read 0.43, which he said was unusually high.
But after speaking to one of the staff I mentioned I cleaned my K&N air filter last week and he said that would not have helped at all and more than likely raised the level, although in the same breath he also said it wouldn't have been significant enough to make it pass.
So something to note, a dirty paper filter could actually lower your test results.
I had the Cat. fitted anyway, as i never really had much choice.
I was there about 70mins in total, which included the initial Dyno test, then having the Cat. fitted, then a retest again.
Whole lot cost £435
No power loss whatsoever, but it has changed the sound of the bike a little bit, but to be honest I like the new sound so no worries there.
I asked about how I will know when it's all well and good and was to told to download an app tomorrow called TFL DRIVE, and when I enter my Reg. Number it will state that my bike is exempt.
And finally it was pointed out to me that no bike is the same, so one bike may pass whereas another might fail, even if they are the same year and model of bike. This is due to many factors so there is no way of knowing what your bike will show up.
So clean high grade fuel and dirty filter is key?
I'm thinking of having mine tested but don't fancy a £300+ bill