Modern Buddy

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!!! [/img]

Whoa

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

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!!!

So what, that shouldn't have mattered.

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

--Keys

tisk tisk, somebody has been racing their scooter again.

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

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!!!!!

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?

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

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?

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

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

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.

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

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?

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?

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