Tuesday, July 21, 2015

Make a Bimota SB6 Replica from Suzuki GAG.How to GAG engine to 50mm long stroke and self-starter part 2.

GAG for 50mm stroke crank of Takekawa is discontinued. The parts also discontinued often. So either you are not crowded I think it is impossible to OH it?

Do you know that you can OH if diverted parts for the Monkey?

Connecting rod, connecting rod bearing --- Takekawa for Monkey
Crank pin is 1mm shorter length than for the Monkey.

This crank pin you can diversion. By 1mm shorter processing.
Takekawa of part number
Connecting rod ---- 00-01-0051 ---- price 4,500 yen
Connecting rod bearing ---- ---- 00-01-0010 fixed price 980 yen
Crank pin ---- ---- 00-01-0026 fixed price 980 yen

I do not the OH.
However, even make a self-starter crank, there is a need to use these. I have ordered them.

I want to like this constitute a self-starter crank.
Flywheel side --- birdie
Clutch side --- GAG
Crank pin and the connecting rod --- Takekawa

I decided to proceed with a little bit of work.
I was decomposition GAG, a birdie of normal crank.

It's to decompose in a hydraulic press, but press-fit is strong!.
Flywheel side of this has become thick unlike Honda Porter. Less space.

I did what was observing the crank pin, both ends are satin finish.
Pin of this specification, a strong press-fit.
This pin is the centering is difficult to do so strong. However, the intensity I think high, as the crank shaft.
Crank pin of Kawasaki KSR110 also have this type, depending on the product year. This is difficult centering.

Oil that has been attached to this it was dirty. However, damage of parts is small.

----- Comparison result -----
Connecting rod --- birdie and GAG, exactly the same.
Crank weight ---- different! Fundamentally different!

Birdie ↓


Birdie --- symmetrical
GAG ---- asymmetrical
This may weigh different, the fact that the shape of the weight different.

I think.
Asymmetric crank weight is, why it is asymmetric, I think that's because have adopted the offset cylinder.
The offset amount of the offset cylinder's usually 5 ~ 10mm.
It is when the piston is in top dead center, the crank will be in a position advanced from the top dead center about 5 °.
Weights are attached in order to be balancing the piston around and weight. So, when the piston is just above it shall be come beneath the weight.
So weight comes with the advanced position of about 5 °.

Offset cylinder has the advantage.
Reduction of the piston hitting sound.
During the expansion process, it can take a connecting rod is straight.
So it seems has been adopted in many models.
It is it standard that is offset rather than.

Web site of the Honda is commentary. here

...... I would do such mean?
Perhaps crankcase, should common.
It would cylinder offset the difference?
After I try to measure the GAG case, no it must be designed the weight of the crank weight.

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