Re-igniting the old Thread

Some More to put some fuel in the Fire:


1) DTS-Si means..??

2) CBZ has got ATFT..?.? What is ATFT.?

3) What does Sprung and Unsprung Wieght Means.?

4) What is the basic Difference between chasis of Pulsar(Double Craddle) and R15.(Delta Box frame)

5) Karizma was launched in year?

They are called perforated discs.

The holes are for ventilation.

Observe the scorpio s Discs the next time. U would see some pattern on it. Most modern cars also have ventilated discs but u should observe them parallely. They are like two discs sandwiched , which is also for ventilation.

I'll clear your doubts one by one.
*The Roadking did have a flower head on its last days and we already have a few. My friend owns an assortment of spares and that includes some factory cylinders. Yes, you need to explore the other part of India and more so, Mysore which is where the factory was located. I've been there 4 times when the factory was stripped down and parts auctioned. I have seen all the factory prototypes and seen more than what i can type here.
*Have i riddden a Y350? My dear friend, I was using one for a short while. I very well know how good it is.
*And I have ridden some good Furys as well, so I can comfortably comment on the performance and not going alone by the performance figures.
*Why is a Y350 dates?
- Has a really dated intake system. 2 cylinders fed by just one 28mm carb which makes it seriously underpowered
-have you ever seen the transfers? Its a 40yr old tech
-the internal transmission layout with a chain drive is again decades old when an RD has a positive gear type transmission.
-busting internal oil seals which is the most unreliable thing about the Y350 and the tech used all through the engine is really dated. jawa did nothing about updating the design or their flaws
*The jawas/Yezdi all ran with CB and so did the RD. That alone does not make something old tech. The overall engine design is what matters.
The Roadking however is my favourite and it was the better one of the lot.
Being on this part of India where I get to ride and see better and more Jawas/yezdis and having worked on a few bikes myself, i sure know of what I'm talking. Hope you clear now.

i had a question in mind but didn't knew where to ask it,so if this is the wrong thread then forgive me.
why do disc's of disc breaks in bike have small holes in them and whereas the disc from a car is totally smooth?

About the flower-head thing, i think CL-II never came with a flower-head. some early Model-B(1973-74) yezdi had a flower-head, but was later shifted to the normal that we see more more often, Roadkings with FH, maybe i have to explore more of India to see it.
i think you should ride a Y350 to know whats the difference between Y350 and Fury. Numbers, sometimes, dont show the actual performance.
Fury 175, in no way, can do anything to Y350, Roadking .
How do you say that Y350 was dated ? simply coz it had CB point system ? more than 50% of Ys and all Jawas are on CB Point system in the country and people are happy to ride it. it might be dated if you look at the lipstick, powder and makeup of it, i agree.

Nice example , understood!

A 3-valve is almost as efficient as a 4-valve. Both the valves open and close at the same bike and not like what someone mentioned here.
In the TVS flame, the port flow into each valve is controlled by stacking one port over the other and as the slide opens beyond 50%, the 2nd port get the charge. Its a clever tech by AVL.
Now having a single exhaust valve does not mean it will underperform. It will still be more efficient than a conventional 2 valve head.

Very good example, thanks for explaining like this

But I think the second intake valve operates only at higher rev range when the bike is (so to speak) in power mode !

Dunno exactly how LML Adreno/Energy worked !!
But if the second intake valve keeps operating without any fuel going to it, it might even get damaged right ??

hmmm... what a sad... the people at that time didn't know how to select a good vehicle... my father had a chetak scooter at that time... i dream now if he had an RD350 instead of a scooter at that time...

Simple answer. Take a coke bottle, fill it with water, turn it upside down. You'll see that the water starts to flow fast in the beginning, but soon "Chokes" at the orifice. As a result, the flow becomes more uneven. A watering can on the other hand, has multiple holes. Use one and you'll see that the flow is much smoother, much more even.

Same principle.

This is the common prob with many yezdi's at that time,like these days bajaj chetak 2 stroke have similar problem of going backwards.
Sir old fox plz elaborate.what is the technical flaw in this situation cos u had told me in tech language which i cant elaborate here.

OT i guess , but wanted to ask how does that help , does it mean more 'efficient' intake with two valves?

Here in Raipur Many Yezdi's have been modified to run on Kerosene. A good Yezdi trait.