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Messages - Rob Atkinson

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1
Twins / Re: Spitfire Tank fitting
« on: 30 July, 2017, 14:58:16 »
I am also trying to fit a Spitfire fibreglass tank after removing it to fit choke slides, (earlier post), and would benefit from the wealth of knowledge out there. I took notice of the way it was fitted as I removed it. The tank was very secure but not fitted exactly as per the manual drawings. A few things: Although my bike is a MK2 fitted with concentrics, I believe it is fitted with a 5 gallon fibreglass tank as fitted to MK3 & MK4 Spitfires. Most, but not all, specifications sheets I have read state the earlier fibreglass tanks were 4 gallon and later models had the 5 gallon version. I bought a strap or petrol tank bracket for a 4 gallon fibreglass tank from a reliable source but found the two studs that are fixed to the underside of the tank are too wide apart for the bracket. The studs appear to be original and there is no evidence of repair work on them. I am getting a local engineering workshop to adapt the bracket. The one fitted prior to me removing the tank was a straight bar as fitted the A10 etc. so the spike and rubber bush were not utilised. I have spent hours on the internet looking at photos of different models of Spitfires but the tanks look the same shape. Does anyone know if there were 4 & 5 gallon versions of the fibreglass tanks and if they had a very similar profile?
Next query or observation: the steel tanks I have experience of are all "pulled down" when the centre bolt is tightened. When I have examined the fittings on the fibreglass tank, it seems this does not happen. The spacer tube fits inside the rubber ball and doesn't seem to "space" anything. Plus the rubber ball just seems to act as a steady if this makes sense. Is this correct?
The only thing I can see that pulls the tank down onto the u shaped frame rubbers is the tank bracket on the front underside.
Apologies to Robw as I have not helped you with fitting your tank but I hope any replies to this post may assist us both.

2
Twins / Re: air/choke worth fitting on concentric carbs?
« on: 21 July, 2017, 15:50:55 »
Thanks for the replies to my post, some very useful advice.
 In the original post I had omitted to say the engine is newly rebuilt and the carbs. will need some tweaking after a good run. I will fit a pair of choke slides whether in time they get a great deal of use or not. The tip from Robspitfire is particularly interesting as I had been using a part open throttle and find it much easier to start the bike with the throttle fully closed.
Rob

3
Twins / Re: Indian tanks
« on: 12 July, 2017, 19:17:23 »
I bought an A10 tank a couple of years ago, round badge type. It came with a fuel cap but no badges or taps. Overall I was happy with it. Looked good fitted well but had rust inside which I treated with Tapox, probably worth doing even without the rust given the problems caused by ethanol in modern fuels. I bought it on e-bay from seller AAKASSHUKLA, based in New Delhi which I assume must have a humid climate!, (still advertises), paid 200 delivered to my door. Add the cost of Tapox and a little work I thought it still worth it.

4
Twins / air/choke worth fitting on concentric carbs?
« on: 12 July, 2017, 18:16:03 »
I am having trouble starting an A65 Spitfire fitted with new concentric carbs. My local garage can start it no trouble and it runs very well when started, but I struggle to fire it up. It does not have choke slides fitted and I wonder if anyone has experience of starting with choke slides in place. Does it cold start much easier with chokes on? I had no trouble starting my A10 without a choke fitted.
 It could be age catching up with me or I haven't mastered the technique yet. To me, the kickstart has a completely different feel to the A10 with a lot more travel. Maybe I need a box to stand on!
Any thoughts or tips much appreciated.
Thanks
Rob

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