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View Poll Results: AMERICANS: Would you buy a 125cc motorcycle for the street?
Yes! 28 45.16%
Hell no! 12 19.35%
Yes, but only at the right price. 22 35.48%
Voters: 62. You may not vote on this poll

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Old 04-16-2018, 11:08 PM   #201 (permalink)
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Why two spark plugs? I've heard of a redundant spark plug on an ultra-lite airplane,
but motorbikes don't crash if a spark plug fails..

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Old 04-17-2018, 12:07 AM   #202 (permalink)
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Somehow most of the information you'd want to know about a motorcycle isn't to be found on manufacturers websites anymore. I just looked at what the big 4 had to offer, and not a single HP or speed rating was listed on any bike for any manufacturer. Top speed is very relevant for the lower displacement bikes.

Anyhow, I found Suzuki had a 200cc bike, but other sites that reviewed it said it had a top speed of 65, and didn't get particularly good fuel economy.

No idea why the 250s weigh more than my 17 year old CB600. You can probably find my bike for $2k used. It would get 75 MPG if you geared it taller and drove it like a granny.

First time I've looked at bikes in over a decade, and there are way more options available now, but very few 250 options, and even less below that. This should be an indication of the demand for these displacements. If a bike requires a motorcycle endorsement, then it should also be capable of achieving the speed limits of the state. A 50cc scooter doesn't require an endorsement and will do about 40 MPH.

I get the appeal of small and light bikes. The most fun I had in my motorcycle tour through Peru wasn't on the CRF 450 bikes we rode, but an afternoon tearing around on a 125cc dual sport. This was due to the attention and skill required to get it up a steep, dry riverbed. Driving a 125 at it's limit isn't likely to get you killed like a more powerful machine. That said, I'd still be in Peru if I had to do the whole trip on a 125 (and the policia would have extorted all my money).

Finally, I agree with taking the back roads as often as possible, which I do. That's exactly the place I want to ride fast. I especially have no patience being stuck behind someone that wants to go slow through the curves. Being able to pass anyone in 2 seconds means I never get stuck behind someone.
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Old 04-17-2018, 07:45 AM   #203 (permalink)
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Quote:
Originally Posted by Xringer View Post
Why two spark plugs? I've heard of a redundant spark plug on an ultra-lite airplane,
but motorbikes don't crash if a spark plug fails..
In the days of big dome pistons and low octane gas it was a way to create a dual flame front so the air-fuel mixture didn't get blocked away from the spark plug by the piston's dome. To be honest with the flat top/dished/low dome pistons used nowadays I'm not sure why they went with a dual plug setup unless it's a way to help eliminate pre-ignition (knocking) in markets with really low octane gasoline.
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Old 04-17-2018, 08:56 AM   #204 (permalink)
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Quote:
Originally Posted by Xringer View Post
Why two spark plugs? I've heard of a redundant spark plug on an ultra-lite airplane,
but motorbikes don't crash if a spark plug fails..
Pretty sure it's just to reduce emissions by ensuring more complete combustion. There's no power gain to be had.

The SV650 went to 2 plugs per cyl in 2007, and I'm pretty sure it didn't bump HP but may have increase MPG slightly.
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Old 04-17-2018, 12:41 PM   #205 (permalink)
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Thanks guys. I had a suspicion it had something to do with the EPA.
I wonder if 2 plugs last longer than one plug.?. Longer time between changes?
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Old 04-17-2018, 01:32 PM   #206 (permalink)
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Quote:
Originally Posted by Xringer View Post
I wonder if 2 plugs last longer than one plug.?. Longer time between changes?
It's more likely to not affect the longevity of the spark plugs.

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