YPVS Powervalve
Yamaha RD350 Powervalve Info[edit | edit source]
Introduced: LC2 April 83 ~ NI March 85 ~ FI Feb 85 ~ NII March 86 ~ FII March 86 ~ R Jan 92
Discontinued: LC2 June 85 ~ NI March 86 ~ FI March 86 ~ NII July 87 ~ FII Dec 91 ~ R Dec 95
Frame/engine nos: LC2 31K 000101 ~ NI 31K 077101 ~ FI 31K 053101 ~ NII 1WT 005101 ~ FII 1WT 000101 & 015101 86 to 88 ~ R 9c64ce00n0000101, Engine 4ce6-0000101
Colours
- LC2 pearl White with red & Black with red
- NI Clean white with red & new black with red
- FI Silky white & stormy red or silky white and french blue
- NII silky white and red & black & red
- FII Red white & blue~ Blue & yellow ~black & gun met
- R Red white & blue ~ Black onyx & purple
Specification[edit | edit source]
- Bore and stroke: 64mm x 54mm
- Capacity: 347cc
- Max power: LC2, NI, FI, 59BHP ~ NII, FII 62BHP ~ R 59BHP
- Gears: 6
- Wheels: 18-inch front and rear
- Fuel capacity: 4.4 gallons
- Performance: LC2, NI 118 mph ~ FI, NII, FII 120 mph ~ R 115 mph
- Weight: LC2 361 lbs ~ NI 355lbs ~ FI, 364lbs ~ NII 355lbs ~ FII 364lbas ~ R 365
Yamaha LCII 350YPVS[edit | edit source]
The New LCll 350YPVS or "valve" as it is now known was another leap forward in two stroke technology. This 347cc twin cylinder was fitted with rotating valves in each exhaust port, which were able to vary the port height by opening up as the revs climed higher. This gave it stacks of bottom end without afecting its top end as the valves rotated to poen wide open giving a fantastic 58 bhp at the back wheel.
The new 350 YPVS could see 120mph. It was fitted with twin calipers at the front and had grown a 3ed disk on the back. It was fitted with air asisted variable damping in the forks wich had allso got a little befier. It was fitted with a new rising-rate mono-shock suspension. The bike was an instant best seller in its class.
n.b. (N) stands for no fairing and (F) stands for full fairing.
The new bike of 83 was obviously a massive success kicking ass up and down the country. However In 85 two new models were introduced the N1 & F1, basically the same as the LCII, but without the nose cone or with a full fairing. There were a number of small changes to the electrics, expansions,etcand the front calipers had aposed pistons, but no substantial changers.
The (F) sold in grater numbers then the (N). Other then the round headlight on the (N) the cage that holds the clocks and the rad cover they are the same bike. This model has the best timing curve of all the Valves, some people put the stator and CDI from this onto other valves to gane the extra 500 rpm you get from this mod.
The FII & NII had different wheels, forks,tank,seat,placticts, footpegs & hangers, electrics. They had power jet carbs, better looking expansions and a more sporty looking set of clocks. Although the CDI and stator restricted the revs and pick up a little, unlike the earlier models witch gave 500rpm more the FII had more BHP at the back wheel 62BHP compared to the 59BHP of the earler models. If you have a FII or NII and want a few more revs out of it a simpler mod then chanjung the stator and CDI is to get a lightend fly wheel, this gives you the extra 500 rpm but the pickup is faster and you get les pull on the crank. Its a far better mod and cheeper.
FII YPVS[edit | edit source]
In 1988 2 new color where added, blue/yellow & black and gun metal.
NII YPVS[edit | edit source]
The (NII) fell by the wayside in 87 but the (FII) soldiered on untill the end of 91 a good 4 years later. Many thought this was the end, but you cant keep a good bike down and in early 92 up poped the (R).
350 (R) YPVS[edit | edit source]
The RD 350RR was made in Brazil, practicaly the same as the FII different electric's. Twin lights, miner mods all over, It suffed from pour build quality compared to FII. It still sold up to the very end of 1995. This was the slowest of the valves and prooved unpopular with the punters. Not realy suprizing when you look at the compertishon out at the time the 140 mph KR1S and the sleek looking USD RGV.The Brazilian 350 R had a compression ratio of 5:1 (instead of 6:1) like the others.
Interesting to note that even though the TZR that came out in 85 and sold 20,000 bikes in a matter of months after it's launch, which is a superior bike, and was to replace the 350YPVS was discontinued well befor the (R) model was. How many bikes can say that they out lasted ther replacement.