Spark Plugs wrong type according to manual is it an issue?

[PeteB_2000]

Hiya,

The SP that are in my 84 25XD Merc are NGK BUHW although according to the manual it should be using BUHW-2, is this an issue?, what the difference between the 2?

Thanks and regards
Pete

 

[Bob_VT]

Re: Spark Plugs wrong type according to manual is it an issue?

If it is not what is in the manual or an acceptable cross referenced plug you could be in touble. You are running a plug in a differant heat range and might have the wrong length threads.

Considering that NGK plugs are about $2.75 each just replace them. Cheaper than a rebuild. Why take chances...........

 

[Laddies]

Re: Spark Plugs wrong type according to manual is it an issue?

Our 44 cu.in. Mercury racing engines use those plugs and differant yearly manuals call for one or the other plugs, so I called NGKs service line and the fellow I talked to said the plugs were the same heat range but the gap between the center electrode and ground was about .005 to .008 larger on the BUHW-2 plugs causeing a slightly higher (Hotter) voltage in the firing of the plug to help prevent idle fouling

 

[PeteB_2000]

Re: Spark Plugs wrong type according to manual is it an issue?

hiya chaps,

Many many thanks for the info, looks like it is not really an issue, I will try and source the correct type though

Regards
Pete

 

[canadian_fisher]

Re: Spark Plugs wrong type according to manual is it an issue?

Pete,

Using the wrong plugs can be very bad.
As mentioned, the wrong heat range could cause the Piston to blow a hole.

Buy new plugs.

CF

 

[Todd Gerber]

Re: Spark Plugs wrong type according to manual is it an issue?

When I went to my dealer to get new Champions for my '74 650, the dealer stated that his book now said to use NGK's. So that's what mine has now. Can't remember what number they are though.

 

[PeteB_2000]

Re: Spark Plugs wrong type according to manual is it an issue?

thanks for taking the time to reply chaps

Pete