Hi to everyone,
Due to restrictions in Wales I have been unable to run my Dragonfly since it's rebuild, but I have today ridden it for about eight miles and it is a joy, it's smooth, handles fine and I really like it and want to use it but! there is always a but, I am leaving a plumes of blue smoke behind me
The bores were standard size although worn, but I honed them and bought set of rings from Cox and Turner but as I thought it didn't fix it, so I have read up about fitting Honda CB250N pistons and rings and compared sizes but I have a few questions.
1. What is the Honda part number? is it 13101-442-004 this is for a std 62mm piston
2. The Honda piston is 5mm greater in height than the Douglas, any issues there?
3. I shall have to make a pair of small end bushes so could somebody tell me the correct spec material to use
4. The small end to top of piston seems ok , unless anyone knows different.
5. If I fail to find 62mm pistons how bigger can I go before the cylinder spigot gets too weak.
Thank you for reading this
Kind regards Colin