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General Category >> Rubber Side Down! >> Setting rpm?
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Message started by 00savage on 05/22/13 at 11:08:21

Title: Setting rpm?
Post by 00savage on 05/22/13 at 11:08:21

I ordered a tach/hour meter off ebay. I'm sure it's not the most accurate way to go but the price was right. So, the question is do I set it up for 2 fires per revolution or 1fire per revolution? Thanks!

Title: Re: Setting rpm?
Post by Dave on 05/22/13 at 11:16:57

1 fire per revolution.

Title: Re: Setting rpm?
Post by justin_o_guy2 on 05/22/13 at 14:08:56

This one fires every time the crank comes around. It fires on exhaust & compression. So, there ya go.

Title: Re: Setting rpm?
Post by Digger on 05/22/13 at 19:03:19

6161223027303634510 wrote:

FWIW....

Actually, the question should be: "So, the question is do I set it up for 1 fire per 1 revolution or 1 fire per 2 revolutions?"

Title: Re: Setting rpm?
Post by mpescatori on 05/23/13 at 05:37:03

5353100215020406630 wrote:

I WISH it had 2 fires per revolution... and 2 spark plugs at that !

:D

Title: Re: Setting rpm?
Post by LANCER on 05/23/13 at 07:16:39

2C3124322220352E3328410 wrote:

[quote author=5353100215020406630 link=1369246101/0#0 date=1369246101]I ordered a tach/hour meter off ebay. I'm sure it's not the most accurate way to go but the price was right. So, the question is do I set it up for 2 fires per revolution or 1fire per revolution? Thanks!

I WISH it had 2 fires per revolution... and 2 spark plugs at that !

:D[/quote]

The head on the DR650 engine is similar to the LS650 head, with the exception of the exhaust ports, and it has 2 spark plugs.
When comparing side by side it is evident that the LS650 head is capable of having a second spark plug hole drilled and tapped just like the DR head ... IT WILL WORK.
That is on the list of things to do the next time my head is off the engine.
All that's needed beyond that is a dual wire coil and they are on the market for all those V-twins out there with dual plug heads.

Title: Re: Setting rpm?
Post by Super Thumper on 05/23/13 at 18:01:12

Will you please post some pics of the head when you make this mod?

Title: Re: Setting rpm?
Post by Routy on 05/24/13 at 22:04:38

I like 1 spark plug ! That way if a spark plug gives me trouble, I know which one it is.
I like a thumper for the same reason, if it starts missing, I know exactly which cylinder it is ;D

Title: Re: Setting rpm?
Post by Steve H on 05/25/13 at 08:21:27

Yeah but with only one cylinder, missing could be a much more critical situation than a twin or four.