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Post by earlystock on Sept 16, 2018 15:34:03 GMT
So finally got the air out of the brakes (1977 CB400T) and fork seals changed and felt comfortable going for a longer ride (the brakes are poor compared to my modern bikes, but are as good as I think they will get and certainly adequate - might try some Goodrich hoses next). The bike performed pretty well , handling is reasonable, no wobbles or odd noises. I got to a dual carriageway and though I would open the throttle a bit. It was fine up to about 8000-8500 rpm, but misfires badly after that. It cruises comfortably at 75, but the top end is just not there. I tried it in a number of gears and it happens in all of them, though as you might expect it shows up most in top gear. I have not stripped the carbs yet (its on the list), but wondered if anyone had any ideas, would like to see the decent weather out before I strip it down. As an aside it was a real pleasure trundling along on the country roads, I have a 2014 GSXR750, a 2016 Vstrom 650, a little Sym Mio 100 scooter and a 1976 fizzy, but the Dream might be the bike that puts the biggest smile on my face!
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Post by buster on Sept 17, 2018 9:16:49 GMT
I dont know anyone elses thoughts on this but its worth bearing in mind perhaps that this bike is a 41 year old air cooled twin, its probably not going to dance upto the red line like a gixer. I seem to recall on the last 250 (I know yours is a 400, but they are fairly similar) I owned the most usable bit of the rev range was between about 5500 and 7000. having said all that if your going to go through the carbs I’d pay careful attention to the main jet circuit and secondry jet circuit.
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Post by bodie on Sept 17, 2018 10:19:35 GMT
I am with buster on the revs thing I only take mine upto 7 there is a nice little power band I use that term loosely !between 6 and 7 I just feel a bit guilty revving the nuts of something that is nearly 40 years old and on the brakes all I have done is made sure the calliper is in tip top shape and fitted some SBS brake pads and it is a lot better than before  |
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Post by Somersetdreamer on Sept 18, 2018 5:45:42 GMT
Opps
I feel bad on my 250 now as I regularly go up to the red zone very rarely go into it though but I ride it like it was made to be ridden I thought it was good for them to use the revs up to the red, maybe I should give the old girl a bit of a rest,
Na I thought about it & she is going to have to put up with another few years of me twisting the right one, just under 50,000 & still running well
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Post by buster on Sept 18, 2018 9:47:53 GMT
Opps I feel bad on my 250 now as I regularly go up to the red zone very rarely go into it though but I ride it like it was made to be ridden I thought it was good for them to use the revs up to the red, maybe I should give the old girl a bit of a rest, Na I thought about it & she is going to have to put up with another few years of me twisting the right one, just under 50,000 & still running well pure speculation this but I’d guess your engine was run in really carefully and if its happy revving like that (no pops bangs and rattles) then your probably not doing it any harm. more power to your right arm I say, mind you dont come crying to me if it turns out I’m talking crap and it goes bang... |
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Post by earlystock on Sept 18, 2018 14:50:17 GMT
I stripped the calliper and the master cylinder out - the brakes are way better than they were, just not great (period brakes I guess). They are now acceptable (before I stripped them and renewed the seals, the calliper was not floating, one pad worn down the other one like new!). I have put EBC pads in. To be honest I don't really intend to rev it most of the time, just wanted to see what it could do (and yes your right about the GSXR, it revs to 14000, without missing a beat, and does it very quickly!)
I will leave it till winter so I can use it in the mean time.
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Post by buster on Sept 19, 2018 12:15:23 GMT
I stripped the calliper and the master cylinder out - the brakes are way better than they were, just not great (period brakes I guess). They are now acceptable (before I stripped them and renewed the seals, the calliper was not floating, one pad worn down the other one like new!). I have put EBC pads in. To be honest I don't really intend to rev it most of the time, just wanted to see what it could do (and yes your right about the GSXR, it revs to 14000, without missing a beat, and does it very quickly!) I will leave it till winter so I can use it in the mean time. yep know the feeling, my own zx9 ninja when you hit 6000rpm then just sings to the red line, bit of an eye opener the first time I did it what I had thought was the horizon was suddenly under my front wheel |
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ian
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Isle of Man
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Post by ian on Sept 19, 2018 20:56:11 GMT
Opps I feel bad on my 250 now as I regularly go up to the red zone very rarely go into it though but I ride it like it was made to be ridden I thought it was good for them to use the revs up to the red, maybe I should give the old girl a bit of a rest, Na I thought about it & she is going to have to put up with another few years of me twisting the right one, just under 50,000 & still running well Had mine up to the 'S' several times - thought the red bit was the power band & 'O' was the max  |
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