Re: XS400 carb swap from later model. wrote:
> On Mar 7, 8:31?pm, flyright1...@gmail,com wrote:
>
>> I am thinking about an RD400 or a GT550, any suggestions?
>
> If I want to get seriously nervous, it's cheaper to chew guarana
> berries...
>
> But the ultimate Japanese two strokes are the Yamaha and Suzuki square
> fours,
> as I recall they were the RV500 and the RG500. I rode both of them and
> realized that ownership would require a serious commitment that I was
> unwilling to make.
>
> The RD400 Daytona Special was a very nice final version of the air
> cooled Yamaha twins that evolved from the earliest copy of a German
> design. I had a 1961 YDS1 and a bastard YDS3 that I assembled in 1967
> from various parts obtained from $tealer$hips and $alvage yards.
>
> All of those old Yamahas and the R5 and the RD series that evolved
> from them were too small for a person of average size. Even the
> Daytona Special felt small to me.
>
> And the water-cooled versions like the LC and the RZ350 were still
> small and don't seem to be capable of extended high speed operation at
> high RPM on open roads, if Bob Nixon's experience proves anything.
>
> I only remember about two riders that had GT550's with the ram air
> cooled heads. The GT750 was a much better long distance road machine,
> it liked to run at 90 mph all day, and surged and bucked if I tried to
> go slower.
>
> I had lots of confidence in the GT750 chassis, after I installed
> bronze swing arm bushings and after market shocks and lighter springs
> on the back. I used to go squirreling around on mountain roads with
> the RD350 guys.
>
> The short wheelbase made the RD350's prone to wheelstanding when they
> came on the power and they would also drag their solid footpeg bar
> that ran under the engine, so those guys would cobble up their own
> footpegs or install aftermarket rearsets.
>
> But the GT750 was always wearing out tires, brake shoes and chains,
> and always needed to have the ignition points cleaned and re-set. I
> got tired of all the nit-picking maintenance after a few years
>
>> I can't afford an H1 or H2.
>
> Those things are very expensive nowadays.
>
>> I really want a 2 stroke race bike. I grew up
>> riding dirt smokers and would love to have a street bike.
>
> Well, if you don't have to ride very far, and you do most of your
> riding on back roads,
> an RD400 will probably work just fine.
>
> There are also grey market 2-strokes like Aprilias with Suzuki 250
> motors and Honda triples. I think the triples were NS250's.
>
> If you can find somebody who have gotten an Aprilia registered for the
> street in any state, it might be worth considering, even if it does
> cost $5K.
>
> Some local riders bought the grey market two strokes to ride on the
> Angeles Crest Hwy above Pasadena. The 2-strokes are so thirsty, they
> can barely make it 25 miles up to the roadhouse at Newcombs Ranch,
> then they have to go back down the hill to buy gasoline.
>
> But the short wheelbase 2-strokes don't need to lean so far over to go
> through a turn, so they can go around the curves very easily.
A guy from Britain told me that the RD350's caused a change in the UK
graduated licensing laws because because newly-licensed teenagers could
immediately outdrag most cars if they had one of those bikes.
Apparently before they came out, the authorities equated displacement
with speed. Is this true?
I got a kick out of taking apart an old Suzuki (IIRC) 500cc engine that
had two crankshafts. You could see how it was actually two of their
250cc two-stoke engines put together. Maybe somebody here can remember
the model (I think the nickname for the smaller one was Gamma) but
apparently both are quite prized now.