A PICTURE IS WORTH A THOUSAND WORDS

weezool · Post by **weezool** » Wed Jan 13, 2010 2:04 am

OK GUYS HERE IS WHY MY BIKE SIZED ,THE LOCAL SCOOTER MECHANIC PUT THIS PLUG IN MY NEW BB,KIT AND THIS IS WHAT HAPPENED,SO HERE IS THE LESSON THAT I LEARNED ,SO HOPEFULLY IT WONT HAPPEN TO YOU!!!

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bigbropgo · Post by **bigbropgo** » Wed Jan 13, 2010 2:42 am

Whoa

B02S4 · Post by **B02S4** » Wed Jan 13, 2010 3:18 am

The factory spec plug is a NGK BP7HS, did your BBK spec something different?

weezool · Post by **weezool** » Wed Jan 13, 2010 3:37 am

no thats what was in it, the guy put in a bpr7hs and told me he put a resister plug in!! I found out when i pulled the head!!!

B02S4 · Post by **B02S4** » Wed Jan 13, 2010 1:10 pm

So what, that shouldn't have mattered.

Keys · Post by **Keys** » Wed Jan 13, 2010 5:04 pm

That's exactly what MY piston looked like. But it's true...the resistor plug should have made no difference at all.

--Keys

bigbropgo · Post by **bigbropgo** » Wed Jan 13, 2010 6:44 pm

tisk tisk, somebody has been racing their scooter again.

jmkjr72 · Post by **jmkjr72** » Wed Jan 13, 2010 8:08 pm

actauly that is the wrong plug having the resitor has nothing to do with it you had a projector plug and your plug was too hot for a bbk
with a cast iron kit you should have a br8hs and with a al kit you need a br9hs you do not want the projector (that is what the p means
the 7 is too hot of a plug you need a colder plug you seized because of detonation
now if you get a polini kit you will need a completly diffrent plug

weezool · Post by **weezool** » Wed Jan 13, 2010 11:56 pm

THAT IS EXACTLY WHAT HAPPENED THE BPR7HS IS A PREJECTED PLUG, THE B7HS IS THE RIGHT PLUG ,THE RESISTER HAS NOTHING TO DO WITH IT !! ITS THE "P" THKE A CLOSE LOOK AT THE PHOTOS

WRONG

RIGHT !NOW DONT LET THIS HAPPEN TO YOU !!! GUYS THIS IS HOW I / WE, LEARN SO THATS WHY I AM POASTING THIS ,I HAVE GOT A LOT OF HELP ON HERE SO I WANT TO CONTRIBUTE!!!!!

B02S4 · Post by **B02S4** » Thu Jan 14, 2010 12:11 am

http://ngksparkplugs.com/tech_support/s ... p?mode=nml

http://ngksparkplugs.com/docs/tech/partnumberkey.pdf

^ for reference...

I'm not convinced that the "P" plug in and of itself caused the detonation.
What plug did your mechanic intend to install?

jmkjr72 · Post by **jmkjr72** » Thu Jan 14, 2010 12:26 am

i know many of the kits require the you get rid of the p but they also say to go to an 8 or 9 now polini has you use a completly diffrent plug

if you set your squish band too tight and other things are off a bit the p will slap the piston

but again a 7 is too hot considering most of the bbks run 11.5 to 14.5:1 cr where stock is about 8.5 to 9.0:1
so premiume and a colder plug are a must

B02S4 · Post by **B02S4** » Thu Jan 14, 2010 12:54 am

Stock Rat 110 CR is < 7:1 (6.6:1)!

There are other factors that could cause detonation.

What was the air filter, carb, carb settings, oil, & octane?

weezool · Post by **weezool** » Thu Jan 14, 2010 5:04 pm

THE CARB WAS STOCK WITH A 95 JET THE BOX WAS SLIGHTLY MOD

JUST OPENED UP A LITTLE ,THE OIL WAS MOITOUL ,I THINK 710.THE GAS I WAS USEING WAS MID GRAGE ,I ALSO HAD ABOUT 250 MILS ON THE KIT,THE OIL AIR JET WAS 1AND 1/2 TURNS WITH 6.5 GRMS ROLLERS

B02S4 · Post by **B02S4** » Fri Jan 15, 2010 2:11 am

Dude, that is a pic of a prior iteration my airbox cover...& I took that photo...

bigbropgo · Post by **bigbropgo** » Fri Jan 15, 2010 2:49 am

Thought I had seen that before. Or something very close. Not the hole that was cut but the marks around the hole looks the same.

Keys · Post by **Keys** » Sat Jan 16, 2010 1:08 am

I swapped my BPR7HS out for a BP8HS today. It actually felt a little stronger. I've modified my airbox by removing the "wall" that the rubber elbow fits into completely. I also have a Prima pipe and re-jetted the carb up to a 115 main jet. It wheelies easily and runs very strong in the low to mid-range. Lost about 5 mph on top, though.

I hope this plug change will cure my detonation melt-down issue.

--Keys

B02S4 · Post by **B02S4** » Sat Jan 16, 2010 1:16 am

Keys wrote:...I've modified my airbox by removing the "wall" that the rubber elbow fits into completely. ...

Are you using the stock paper filter element?

chelsea · Post by **chelsea** » Sat Jan 16, 2010 4:01 pm

Hey OP (and anyone else who has had a RH or Ratt blow up):

Can you snap a pic of the underside of the piston?

Keys · Post by **Keys** » Sat Jan 16, 2010 6:46 pm

B02S4 wrote:Are you using the stock paper filter element?

Yes, I am. 3 holes in the "punch-outs" on the outside cover, the wall removed, but yes...still the paper filter element.

--Keys