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My first ride on the 400/4 more like an Ealing Comedy!
McCabe-Thiele (Ted):
--- Quote from: Nurse Julie on June 14, 2022, 12:15:12 PM ---What you have described above Ted is exactly how my 400/4 was after the engine rebuild. The engine felt heavy, tight and slow (in comparison to how it felt before the rebuild). It took a good 500 miles for things to start loosening off and even then, the performance was not staggering. But, all of a sudden, at about 1200 miles IIRC, the engine loosened off and she was a flying machine. Regular up and down the gearbox is a normal state of affairs for the 400/4 even when fully run in. At this stage, with your bike, regular gear changes are advisable. Just keep riding it and I'm sure it will perform better as you increase the mileage.
If you read the last knocking of my rebuild thread, I explained there how and at what mileage it started loosening off.
--- End quote ---
Today my odometer reads a total of 63.7 miles I did a run to Ashbourne turning back at Mayfield, tbh I found the engine seemed noticeably better at maintaning speed compared to yesterday - not huge but enough to notice the odd undulation did not slow me down as much. Thanks NJ you are spot on with your comments so far.
McCabe-Thiele (Ted):
Bike conked out today on the way back from Ashbourne. Really thought something nasty had gone wrong. After lamenting whilst sat on the grass verge realised I might have run out of petrol. Onto reserve and away - only managed 31 mpg! I really thought I had flogged it too hard in the hot weather.
Oddjob:
31mpg is pretty bad Ted, you should get over 50mpg on a 400.
K2-K6:
Good progress Ted. Make sure you switch the petrol back to main tank when you fill up else you get a nice surprise next time it goes to "reserve".
Not that I've ever done that in rush our on London's south circular :-[ and a two mile push to get more fuel :-\ oh no sir, not me.
McCabe-Thiele (Ted):
--- Quote from: Oddjob on June 16, 2022, 07:15:53 PM ---31mpg is pretty bad Ted, you should get over 50mpg on a 400.
--- End quote ---
I agree I suspect that its as a result of the running in period going up and down the gearbox all the time plus the popping & banging isn't getting any better. I'm pretty much maintaining close to 4k rpm so that might be to blame.
I have established that there are no exhuast leaks at the maniold/cylinder head end of the front pipes pipes or where the four pipes go into the silencer all the noise is out of the silencer end I can feel the shock wave at the tail pipe.
My system is a newish Motad one that came with the bike I'm planning to remove the plugs soon to see how they look currently have only done 115 miles so will wait until I've done a more sensible run probably when I reach 150 miles..
Clean exhaust no smoke of any colour.
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