Hi All
I am the bloke who has been doing Marks testing for him and just to give it some provinance , I have some Rider qualifications as well as mechanical expertise.
I am an I.A.M trainer,Bike safe trainer,ROSPA (GOLD), Police Advanced class 1 on road and off road, Some city and guilds quals in construction and use as well as prohibition. I have over 20 years of riding experience on a vast array of machines from off road 125 up to Kawasaki 1400. I cover about 20k a year on a bike doing a huge mixture of rural and motorway and sometimes usually once per year somewhere on the continent.
I have tried both sets of the Rad and oil covers covering two weeks of moderate to hard riding during our last heat wave and did not have any issue with overheating. I stuck in town for an hour on one of the days just to try and get it to overheat but once the fan kicked in it was fine. I am not using the covers with the bigger holes but haven't had a problem with either though if you feel there is an issue then go for the larger holes.
Not only do they offer fantastic protection that will never rust but they look great and really make your machine stand out.
I have also tried the spacer after carrying out some research which I will share for the benefit of the forum. 20 Year Suzuki DEALER TOLD ME THAT THEY ARE AWARE OF THE PROBLEM HOWEVER AS A CHAIN (TYPE DEPENDENT IE STANDARD, O RING) with rigorous maintenance should last between 20-40k and at that time you should also change your sprockets ( sorry if I'm teaching you to suck eggs ). Suzuki class this as FAIR wear and Tear therefore never bothered to try and rectify or fleet recall the machines. I personally had never noticed a problem and as this is the 3rd Suzuki I have owned, I assumed that it was a characteristic.
However once the spacer was fitted you could have knocked me off the bike with a feather,I could not believe the difference, no more clunk ,even when you engage first gear on idle there is barely a sound. All changes much smother. Tried it on Motorway, rural roads and a little bit of off road ( only about 10 miles ) also tried gear changes with and with out clutch still sweet as a nut. This will have the added effect of extending my chain and sprocket life as well as rear Tyre and also make the bike even more economical to run ( albeit negligble ).
Hope this helps