LanzaTZ Posted October 6, 2010 Posted October 6, 2010 Hello, I have a hard time buying the correct plug for my bike. It is supposed to use a BR9ES which has threads that are about 1" long. In my town I found a similar plug but the threads are only about 1/2" long. The store owner told me that since it is shorter it won't get as fouled up as my other one. And so far my bike has been running better. But am I hurting it? Thanks
Moderator drewpy Posted October 6, 2010 Moderator Posted October 6, 2010 Hello, I have a hard time buying the correct plug for my bike. It is supposed to use a BR9ES which has threads that are about 1" long. In my town I found a similar plug but the threads are only about 1/2" long. The store owner told me that since it is shorter it won't get as fouled up as my other one. And so far my bike has been running better. But am I hurting it? Thanks shouldn't think so, reduce compression if anything
Moderator mervin Posted October 6, 2010 Moderator Posted October 6, 2010 I really cannot recommend it, one if it is the wrong heat range it could melt, 2 the threads that are left exposed by the short plug will coke up and make it very very difficult to put the corrrectone back in, possibly stripping threads and needing a thread restoration/new head, can you not order the correct plugs from an internet supplier Merv
HoughMade Posted October 6, 2010 Posted October 6, 2010 ...the threads that are left exposed by the short plug will coke up and make it very very difficult to put the corrrect one back in... Agreed.
bob-c Posted October 7, 2010 Posted October 7, 2010 To answer the original query, yes change your plug to the correct one . An alternative to the BR9ES is the BR8ES , if you are fouling plugs because of slow running you could try an Iridium plug , they resist fouling so I am told by trials riders, I run an NGK BR8EIX as I ride tight trails with very little full revs and have no problem with plug fouling .
LanzaTZ Posted October 7, 2010 Author Posted October 7, 2010 Ok I found a Champion N9YC which is the same as NGK BP6ES. It looks a lot like the BR9ES. I was told it is usually used in generators. Is there really much difference in spark plugs?
Moderator mervin Posted October 7, 2010 Moderator Posted October 7, 2010 NGK technical link what alll the letters and numbers mean Be careful as i remember the N9y has a longer reach electrode, so put the plug in and turn over carefully in case it contacts as it is the wrong heat range it may foul or melt though merv
LanzaTZ Posted October 7, 2010 Author Posted October 7, 2010 well I put it in and it ran great, so far
YPVS TONE Posted October 7, 2010 Posted October 7, 2010 DO NOT use the N9YC as you WILL end up burning a hole in the top of your piston. On NGK plugs the lower the number in the code means that the plug runs hotter. Look in your manual if it says a BR9ES then find someone who has one . Tony
LanzaTZ Posted October 7, 2010 Author Posted October 7, 2010 DO NOT use the N9YC as you WILL end up burning a hole in the top of your piston. On NGK plugs the lower the number in the code means that the plug runs hotter. Look in your manual if it says a BR9ES then find someone who has one . Tony OK good to know. I usually only ride about 5kms at a time so it is probably wise to find the right plug.
Moderator mervin Posted October 7, 2010 Moderator Posted October 7, 2010 I melted an incorrect Bosch plug in my FS1E in under 5 km,s mind you it was guess work as i was desperate and the storeman at work did not have a cross reference chart at the time
LanzaTZ Posted October 12, 2010 Author Posted October 12, 2010 I looked all over my town again and all I can find that is close to my plug is a BP6ES. It looks the same but I am concerned about that heat rating of 6 instead of 9. If I melt my piston head, is that easy to fix?
FLYIN BRIAN Posted October 12, 2010 Posted October 12, 2010 If it calls for a 9 and you're doing a lot of short trips, then you can go to an 8 safe enough. I would resist the temptation to use the 6 you found. That's 3 heat ranges HOTTER. If you melt the piston it's a very large repair. Are you changing the plug as maintenance or are you trying to cure a running problem? I.E., where's the plug you are replacing?
LanzaTZ Posted October 12, 2010 Author Posted October 12, 2010 If it calls for a 9 and you're doing a lot of short trips, then you can go to an 8 safe enough. I would resist the temptation to use the 6 you found. That's 3 heat ranges HOTTER. If you melt the piston it's a very large repair. Are you changing the plug as maintenance or are you trying to cure a running problem? I.E., where's the plug you are replacing? My plugs are fouling up too quickly. Where is a good place online to buy plugs from?
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