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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: Billk on October 12, 2018, 01:20:48 PM

Title: Cool weather riding
Post by: Billk on October 12, 2018, 01:20:48 PM

The temperatures here in NY are starting to drop. Why do I feel
that this, K75 rides better in colder temperatures? Is it me
or is it the motorcycle? Anybody else feels the same? Are these
cold weather motorcycles?
Bill

Title: Re: Cool weather riding
Post by: blackie1 on October 12, 2018, 03:03:42 PM

cooler air temp = air that is more dense = more oxygen in that air = bigger bang with the same amount of fuel

it's not rocket science

.........or is it?

Title: Re: Cool weather riding
Post by: natalena on October 12, 2018, 03:57:42 PM

Cooler weather as noted above is a denser charge, and the cooling system isn't stressed. Throttle always feels a little crisper, but that just might be the pleasurable ride experience without being slow-roasted like in summer. Great to hear you're out rolling the brick.

Title: Re: Cool weather riding
Post by: alexg on October 12, 2018, 04:05:12 PM

Just for the sake of it:

I do not think that ICEs run leaner in winter than summer. There is a reason for the MAF sensor: to be able to adjust the fuel according to the amount of air mass. It can be that with every intake stroke, more air mass goes into the cylinder, thus more bang per stroke because both air and fuel have increased.

Title: Re: Cool weather riding
Post by: K1300S on October 12, 2018, 05:59:29 PM

although....K75's do not have Mass flow sensors (MAF).  they have a basic air flow sensor.  there is no "mass" measurement, it is a simple flapper door that moves with the velocity of the air entering the intake.  later versions of the bosch ECU's used a mass flow sensor.

Title: Re: Cool weather riding
Post by: The Mighty Gryphon on October 12, 2018, 06:15:25 PM

I may be wrong, but isn't there a temperature sensor in the throat of the Jetronic that is used to calculate air density?

Title: Re: Cool weather riding
Post by: Billk on October 12, 2018, 06:54:05 PM

I was just out in 57 degree temp and the bike, engine, tranny was super smooth.
I have a heat temperature gun and I’ve notice a 10 degree difference when riding
in 57 degrees as a pose to 80degree +,
Where would be the best place on the engine to monitor heat levels.

By the way, we have some heavy hitters on this forum!
Thanks
Bill

Title: Re: Cool weather riding
Post by: johnny on October 13, 2018, 07:51:16 AM

greetings...

first hard freeze of the season... i like riding mid 30s to mid 60s... rolling out... hope my gps works... caints getts back to the barn without it... unless its clear and jaycar martin can ping me the southern cross...


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