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Board index » Questions & Answers » Honda CR, MR & MT

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newfie
 Post subject: Dual Plugs
PostPosted: Fri Jun 10, 2005 8:50 am 
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Joined: Thu Jun 09, 2005 12:41 pm
Posts: 44
Hi everyone,
I have a '74 MT250 and it has to spark plugs with only 1 plug wire. What is the reason for this?
Newfie

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Newfie
1974 MT250
1974 MR50
1975 CB750F
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ricortes
 Post subject:
PostPosted: Fri Jun 10, 2005 9:16 am 
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Joined: Tue Mar 15, 2005 10:35 am
Posts: 254
They come from the factory with a bolt/plug in one of the holes. This gives you the option of
1) Do nothing and just leave it like it is with one plug
2) Add a compression release valve, only necessary if you bump compression up IMO
3) Put two plugs in and if one fouls you can just switch the plug wire over to the second plug to get going again.

I like the #1 option myself but no harm with #3.
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newfie
 Post subject:
PostPosted: Sat Jun 11, 2005 8:43 am 
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Joined: Thu Jun 09, 2005 12:41 pm
Posts: 44
Is there any difference in performance in either the angled plug or the straight-up plug?
Thanks,
Andrew

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Newfie
1974 MT250
1974 MR50
1975 CB750F
http://spaces.msn.com/members/andrewmer ... photoalbum
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ricortes
 Post subject:
PostPosted: Sat Jun 11, 2005 9:43 am 
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Joined: Tue Mar 15, 2005 10:35 am
Posts: 254
Not that I can feel. There's probably someone with a dyno test that will say one position gives an extra 1/2 hp over the other.

IMO: Just use the plug that goes on top. If you don't have a problem and want to restore it to factory original, buy a fitting for the second hole.
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