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Messages - SumpMagnet
Pages: 1 2 3 [4] 5 6 ... 46
46
« on: November 30, 2022, 07:11:16 PM »
I bought a 2ft steel rule, but I think I paid a bit less.
47
« on: November 29, 2022, 07:33:26 PM »
LOL ...thankfully no....
48
« on: November 28, 2022, 10:16:51 PM »
The one that came on my F2 was battered ...but I had a spare.
It came into my posession many years ago on a Z650 in place of the one that should have been there. I got the right one for that old Kawasaki and kept the Honda cover..... which I used as an ashtray for many years.
Now, I'm older and wiser. Don't smoke....and have had to do a lot of cleaning on that old points cover. But only on the inside!
49
« on: November 28, 2022, 08:22:38 PM »
the whole 'back pressure' thing is a bit of a fallacy.
The valves control the flow of the exhaust gases, and when your inlet valve is open ( bar the period of overlap ) the exhaust valve is closed.
When the exahust valve is open, you want to get the spent mixture out as quickly as possible...and restricting that with back pressure isn;t a help.
Race exhausts are less restrictive than road pipes and have less back pressure as a result. Noise however, is a factor. Road pipes had to deal with that far more than race pipes.
What is critical, as Sesman said, is length and shape. This controls the harmonic resonances that can help pull spent gases out, and prevent loss of the fresh charge where there is a lot of valve overlap.
In a 2-stroke...this is where expansion chambers get their effectiveness from. Controlling how these shock pulses resonate back is why pipes need to be the right length and shape, ands if you want to ruin an exhaust...cut a chunk out of the middle and weld the ends back. Some one made it the length it was for a reason!
the baffles in the back end are to make the thing less noisy, and to do so without losing too much flow.
I dabbled with home-made exhausts way back, and used to have an excellent book on the subject full of formula's to work out lengths of plain pipes, megaphones etc. Sadly..it's long gone.
50
« on: November 27, 2022, 11:49:16 AM »
I am sure if you return the complete machine to Japan, they will refund you the original purchase price.
You do have the receipt I take it?
51
« on: November 20, 2022, 11:24:12 AM »
same here.
I find engine paint tends to run badly if you are not careful, and a mist coat helps it stick. Haven't bakes mine yet....need to make an oven thing to do it.
52
« on: November 20, 2022, 11:22:06 AM »
I love the clean and simple look.
If Honda DID make a bike looking like that, I would want one. They had the chance with the CB1100, but somehow just never got it right.
Ah well.... back to the endless hunt for an exhaust I like for my 750.
53
« on: November 07, 2022, 06:37:06 PM »
If anyone does buy it....I have a NOS M6 nut I would let go for around £500. If they will pay £3K for a tank, I might get a bite 
54
« on: October 30, 2022, 07:48:15 PM »
Thanks guys. I'll have a look at making soome myself, and if that fails...at least I know where I can get some.
55
« on: October 29, 2022, 02:28:58 PM »
Just been getting my various engine casings etc. painted while the unseasonable warm weather continues.
Had to lever out the rubbers that sit between the fins on my 750F2, which are hard as bullets and not particularly nice. The fins seem to have been drilled to locate these round bungs that spread into the hole to help them stay put.
Are they available? ( I can;t seem to find any, but may not be searching with the right terms.... )
Are they actually doing anything? ( they did cut down ringing vibrations on 2 strokes I have owned, but they seem to have deeper and thinner fins )
56
« on: October 14, 2022, 10:56:07 PM »
I used to get parts for my Hornet from there. Only place I could reliably get genuine clutch cables in stock.
57
« on: October 06, 2022, 10:13:42 PM »
I can see where you are going with this ...but isn't that a bit close to the brown tank colour. Would all just kind of 'brown out'.
I would go for a dark chocolate colour. Not black...the colour of a nice plain choccy bar. Would give a bit of contrast without being black.
58
« on: September 17, 2022, 12:01:42 PM »
I'm sure there are ways ......
I remember reading an article in an old Classic Mechanics mag, where they were fixing pitting in front mudguards before re-plating by basically filling the pits with lead.
You could plastic coat the thing .... provided whatever you use to fill the holes can stand the heat in the process and the coating adheres.
If the part is going to get replaced if you can;t fix it .... then that does leave space to experiment!
59
« on: September 11, 2022, 02:27:30 PM »
the pipe is rather odd...and the bars look very strange indeed. LED indicators look out of place too, but aside from that, it's not that bad.
I suspect rhe thing was bought to restore, then the guy lost interest, let it sit in the shed for 10 years, and is moving it on to get the space back. There is probably a lot of stuff that needs sorting with it, but its better than some I have seen up for sale.
60
« on: September 11, 2022, 11:22:28 AM »
what a lovely noise ...... nothing quite like a big six on a loud pipe being given a good workout.
And the guy was not hanging about! I can;t begin to imagine the upper body strength needed to haul a bike like that around a track. I was breaking a sweat just watching!
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