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Old 09-27-2012, 01:23 PM   #16
ST4s
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so, glass half full/empty,..

After typing in my little tidbit considered that your description may have been the other half of the glass.

Cannot imagine personally knowing someone with the immense knowledge base that Kevin has. The guy writes articles drawing from the most diverse range of stuff known to man kind.

Cheers
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Old 09-27-2012, 11:54 PM   #17
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Originally Posted by ShaiDanny View Post
Sorted. It's like getting a new bike. Pheeew.

As to the big bang - if any of you want to know how the 950 feels this way with 4 years of on-road and off-road experience, I'll be glad to share.

Many thanks to you all.
Please share....
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Old 09-28-2012, 06:25 PM   #18
Tangai
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Originally Posted by snowhawk jockey View Post
Tangai,
You were running a stock airbox during your "experiment", correct?
Just curious as I gather data on the subject.
Yeah, everything but the exhaust was stock. I run a two into one with the Aka muffler.
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Old 09-29-2012, 02:34 AM   #19
gefr
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Please explain.

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Originally Posted by cpmodem View Post
Makes sense. The Ninefiddy has been run as a "big bang" engine before by inmates. Haven't heard of a Nine-Ninety doing the same.
O.K. I understand the intake cycle drawing fuel mixture whenever intake valves open in a carbed motor. But the spark plugs would need a different pulse wheel (coil sprocket) to ignite compressed mixture in big bang mode. With the normal 950 ignition wheel he would get the one spark igniting during exhaust cycle. How was that working on ShaiDanny's motor? Or was it selfigniting?
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Old 09-29-2012, 04:58 PM   #20
Goss
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Our 950 fires the spark plug every TDC regardless if it is a compression stroke with fuel mixture ready to detonate.
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Old 09-29-2012, 06:42 PM   #21
Tangai
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Originally Posted by Goss View Post
Our 950 fires the spark plug every TDC regardless if it is a compression stroke with fuel mixture ready to detonate.
In other words, the 950 fires the spark plug every TDC at the compression stroke with fuel mixture ready to detonate and at TDC between the exhaust and intake stroke with nothing to detonate.
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Old 09-29-2012, 08:18 PM   #22
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Originally Posted by ShaiDanny View Post
OK,
So I've been running a big bang for quite some time now.
Very typical at your part of the world
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Old 10-01-2012, 01:44 PM   #23
gefr
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The 950 motor is meant to be a big banger.

Quote:
Originally Posted by Goss View Post
Our 950 fires the spark plug every TDC regardless if it is a compression stroke with fuel mixture ready to detonate.
Quote:
Originally Posted by Tangai View Post
In other words, the 950 fires the spark plug every TDC at the compression stroke with fuel mixture ready to detonate and at TDC between the exhaust and intake stroke with nothing to detonate.
Wow! interesting to know. Thanks guys.
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Old 10-06-2012, 01:19 AM   #24
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Quote:
Originally Posted by nomad guy View Post
Very typical at your part of the world
Don't jinx it... It's been relatively quite around here lately... (:


Quote:
Originally Posted by KTMSER View Post
Please share....
Well... It sounded like crap for (and during) starters... Like a big XR650L....
Running was OK, but torque was noticeably lower than the equivalent 990.
Cold starting was a bitch, both with the stock CV's and the FCR's.
Power output was pretty good, but it always seemed like it could be better, like the bike didn't breath right, regardless of jetting experiments.

It's a completely different bike now. It idles well, revs quicker, pulls harder, sounds better and vibrates totally differently. It's nice to finally ride a v-twin, I tell ya....

I have SD cams on the way. There's never enough HP, you know...

I'll update.
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Old 10-06-2012, 03:35 PM   #25
geometrician
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Sparking the plugs...

Quote:
Originally Posted by Goss View Post
Our 950 fires the spark plug every TDC regardless if it is a compression stroke with fuel mixture ready to detonate.
Quote:
Originally Posted by Tangai View Post
In other words, the 950 fires the spark plug every TDC at the compression stroke with fuel mixture ready to detonate and at TDC between the exhaust and intake stroke with nothing to detonate.
Quote:
Originally Posted by gefr View Post
Wow! interesting to know. Thanks guys.
Don't get corn-fused here anyone- the ignition timing wheel is on the end of the crankshaft and senses every rotation. Our engines weren't made to be "big bang"- 4 cylinder bikes do the same thing... the spark plug(s) fire on every TDC stroke- just nothing to ignite

Engines actually spark their plugs before TDC, and as the engine RPMs increase the spark timing is advanced further to compensate for the strokes being closer together (in time) while the burn-rate of the air/fuel mix remains constant. Conversely, retarding spark makes it easy to start an engine, especially when cold- it just won't want to rev up as quickly. In the old days this was done with spring-loaded flywheel weights rotating either the ignition cam on points-type bikes, or the pickup/points plate in the case of most autombile distributors, which sometimes use a vacuum diaphragm instead of/in addition to the flywheel system to change timing. In the really old days & on some farm equipment to this day you manually adjusted timing with a lever. This will help start a cold engine as well as chug along at just above idle and not stall- useful when plowing, going up steep inclines with a load, etc
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