sunny Posted October 14, 2009 Report Share Posted October 14, 2009 I am sure it has been mentioned somewhere here but a quick search did not turn up the answer. What NGK plug to I need for my almost complete M159? I have ordered the rings and clutch thrust bearing. I have turned a box of parts into what I hope will be a running engine. Quote Link to comment Share on other sites More sharing options...
bultacosteve Posted October 14, 2009 Report Share Posted October 14, 2009 I use a B7ES in mine. Most NGK catalogs say BP5ES but i think that plug is a little too hot. I used the same B7ES in my M159 for 4 years and never fouled it, never had any problems with it. I probably had 150 hours of riding on that plug. I only changed it as a preventative measure not because it wasn't performing properly. Steve Quote Link to comment Share on other sites More sharing options...
feetupfun Posted October 14, 2009 Report Share Posted October 14, 2009 If you are using it for trials competition a BP5ES is ideal. I use BP5ES in my OSSA, Bultaco and Montesa twinshock trials bikes with no issues. If you are doing road riding or energetic trail riding, then go for a cooler plug. Quote Link to comment Share on other sites More sharing options...
sunny Posted October 14, 2009 Author Report Share Posted October 14, 2009 Thanks for the advise maybe I will get one of each and see if it make s a difference Mike Quote Link to comment Share on other sites More sharing options...
swooshdave Posted October 14, 2009 Report Share Posted October 14, 2009 Here's my notes on the spark plugs. [url="http://web.me.com/davefriesen/Site/Bike_Updates_Blog/Entries/2006/8/17_The_Power_of_ Quote Link to comment Share on other sites More sharing options...
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