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Author Topic: Wrist pin bias.  (Read 4313 times)

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Offline Sam Green Racing

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Re: Wrist pin bias.
« Reply #25 on: August 29, 2005, 12:36:42 PM »
 ???
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Offline Jonesy

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Re: Wrist pin bias.
« Reply #26 on: August 29, 2005, 02:18:31 PM »
Here's why Honda claims they did it. Thought you guys might find this interesting...
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Offline Bob Wessner

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Re: Wrist pin bias.
« Reply #27 on: August 29, 2005, 02:22:02 PM »
That is interesting. You get the impression they put some thought into these bikes.  ;D
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Offline MRieck

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Re: Wrist pin bias.
« Reply #28 on: August 29, 2005, 04:50:19 PM »
I see your point Sam. Is that large exhaust cut out there because of the chamber shape? I don't know. I wish there was a close up picture.
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Offline Sam Green Racing

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Re: Wrist pin bias.
« Reply #29 on: August 29, 2005, 05:04:23 PM »
All the pistons for all of these motors have a larger cut out for the inlet valve.
The combstion chambers are all the same as are the valves and valve angles apart from a squish band in the 154 motor to take the 5mm bigger pistons.
Although the pistons in the pic are much higher compression (8.7 up to 10 to 1) I still can't get my head round this big recesse for a small exhaust valve.
If they where Honda pistons I would put them in without a dought, but aftermarket thats another thing.
I will have to get the plastigauge on the job to be sure.

Thanks guys.

Sam.
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C95 sprint bike.
CB95 hybrid race bike
CB95 race bike
CB92
RS 175. sprint/land speed bike
JMR Racing CB750A street ET drag bike

Offline MRieck

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Re: Wrist pin bias.
« Reply #30 on: August 29, 2005, 05:35:19 PM »
Quote from: samcr750 on August 29, 2005, 05:04:23 PM


Although the pistons in the pic are much higher compression (8.7 up to 10 to 1) I still can't get my head round this big recesse for a small exhaust valve.
If they where Honda pistons I would put them in without a dought, but aftermarket thats another thing.


Sam.
I agree with the "aftermarket" part Sam and it would bother me about the valve relief.
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Offline Sam Green Racing

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Re: Wrist pin bias.
« Reply #31 on: August 29, 2005, 05:45:18 PM »
Mike if I could find a genuine Honda one to compare it would be good but the place I thought I could get them, Ohio Cycle, Turned out theirs are aftermarket as well.

Sam.
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C95 sprint bike.
CB95 hybrid race bike
CB95 race bike
CB92
RS 175. sprint/land speed bike
JMR Racing CB750A street ET drag bike

Offline Sam Green Racing

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Re: Wrist pin bias.
« Reply #32 on: September 05, 2005, 04:12:15 PM »
Hey mike, guess what! just bought a close ratio gearbox of a guy in the States and he had a set of genuine Honda pistons.
The good news is they are the same as the aftermarket ones I got, so work on the motor can go ahead.
I have everything to do it now apart from the correct carb, just missed one on ebay a few nights ago >:(
Maybe another one will turn up by the time it's ready to go into the chasis.

Sam.
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C95 sprint bike.
CB95 hybrid race bike
CB95 race bike
CB92
RS 175. sprint/land speed bike
JMR Racing CB750A street ET drag bike

Offline MRieck

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Re: Wrist pin bias.
« Reply #33 on: September 05, 2005, 04:29:44 PM »
Great news Sam! That will keep you in good spirits for a few days I'd guess. ;)
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Offline Sam Green Racing

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Re: Wrist pin bias.
« Reply #34 on: September 05, 2005, 04:33:34 PM »
Yeh, but when the money gets taken out the bank, it's doom and gloom again :(
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C95 sprint bike.
CB95 hybrid race bike
CB95 race bike
CB92
RS 175. sprint/land speed bike
JMR Racing CB750A street ET drag bike

Offline MRieck

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Re: Wrist pin bias.
« Reply #35 on: September 05, 2005, 07:37:03 PM »
Quote from: samcr750 on September 05, 2005, 04:33:34 PM
Yeh, but when the money gets taken out the bank, it's doom and gloom again :(
Such is our lot in life Sam. ;) ;)
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