Spark plug modification.

[Nate D]

Hello everyone, I'm new here. I have a great mod which especialy helps with the torque on the low end of the power band. As an ex-street racer I know the difference a good plug makes so I went looking for a performance one for my new 80cc. I could not find one so I decided to mod my own. Here is what you do. Take out the plug. bend the tip up with pliers so you can work on it. use a dremmel tool with cutting wheel attachment and cut about a 1/16 in groove in the middle of the metal contact tip. Bend it back but angle it so the double tips are closest to the contact node, this insures the spark does not contact farther down getting only 1 spark. make sure the tips are evenly spaced from the contact node. This will make the spark contacts the 2 points giving a more powerful ignition, better torque for dirt trails and hills, plus easier starts!!! enjoy the free mod. Let me know if anyone wants me to post a pic of the modded plug for reference

[freewheeling frank]

ya post a pic i wanna see this puppy

[wildemere]

Be careful bending the electrode. If it breaks in use you will have a gouged cylinder.

The stock plug is poor quality. I have had the electrode come off just trying to set the gap.

After a big movement like described it would be a case of not if but when, even with a quality plug.

[Nate D]

Originally Posted by wildemere

Be careful bending the electrode. If it breaks in use you will have a gouged cylinder.

The stock plug is poor quality. I have had the electrode come off just trying to set the gap.

After a big movement like described it would be a case of not if but when, even with a quality plug.

wildemere those are good points, while spending money for mods is great and sometimes the only option let us not forget the value of learning and sharing free mods & tweaks. As a dsm tuner I can tell you we have shared many free mods on the turbo charged cars, some giving up to 15 hp gains at no cost. I have been using this plug for 4 tanks already and no sign of wear. To ensure you do not snap the electrode make sure the plug is not cold. Room tempurature is fine or let it warm up in the sun bit. Metal can break when cold as it is brittle, when metal is warm it becomes maluable and can be worked with out losing structual integrity.
I just picked up the NGK BP6HS plug I heard about on a forum I will install and provide everyone feed back on a comparison of the 2.

[Nate D]

Originally Posted by freewheeling frank

ya post a pic i wanna see this puppy

Here is a pic, bear with the resolution just snapped em with my Helio ocean 2mp.
Also a comparison next to the stock plug non-modified.

[Nate D]

Originally Posted by Nate D

Here is a pic, bear with the resolution just snapped em with my Helio ocean 2mp.
Also a comparison next to the stock plug non-modified.

OK I am back from a test run using the one I hear people buying the NGK BP6HS and the custom modded stock plug. Here are my findings. Feel free to try the 2 yourself and add your thoughts or feed back.

The NGK plug has a thicker core with a higher energy requirement so I found at low idle the spark wants to fade out due to the low electrical power produced during lower revolutions. You can kick the idle up however in an attempt to remedy this. This plug also extends slightly more which does 2 things, displaces space and increases compression. I found this slightly increased compression seemed a little more powerful on the low band (torque). Hear is the con, since the plug displaces more it lowers the actual displacement of the cylinder reducing the over all CC's of the motor. It was definately lacking power at the high end or top speed.

The Modded plug can idle better at lower rpm, still has significant torque and power increase at lower end of power band and also feels more powerful at the higher rpms.

Here are my thoughts. If you are going to be doing a lot of hill climbing or rough terrain and will not be going faster than 20 use the NGK and up your idle.

If you want good all around performance and plan to hit 30 every now and then, street and light trail riding then use the modded V tip stock plug.

I like to ride on the street, occasional hills, and hit the dirt bike trails now and again so the modded plug felt better for my needs. Yours might be different. As always, consider advice but make your own conclusions and try things for yourself. If you happen to try the free mod or come up with your own new design to try please share with the rest of us. Happy modding.

[skyliner]

well why dont you tell us what type of plug to use i use the ngk bp6hs and i have now problems give us some ideas thank

[wildemere]

Please explain how a spark plug can alter an engines cubic capacity?

Its bore x stroke that determines capacity.

Plug reach would make a minute difference to compression ratio.

[Nate D]

Originally Posted by wildemere

Please explain how a spark plug can alter an engines cubic capacity?

Its bore x stroke that determines capacity.

Plug reach would make a minute difference to compression ratio.

No problem, its simple mathematics my friend. Displacing volume in the chamber lowers the over all displacement. Do not take my word for it. This is also quoted by SBP, a company from what I understand on these posts is a very repspected and trusted company. Quote "with an extended tip,it centers the spark in the combustion chamber and actually displaces volume, effectively increasing compression ratio."

reference link
Sick Bike Parts

[Nate D]

Originally Posted by skyliner

well why dont you tell us what type of plug to use i use the ngk bp6hs and i have now problems give us some ideas thank

Hey skyliner, thanks for posting on this thread. The plug mentioned is the stock plug that comes with the engine. I shared a free mod you can do. Instructions and pics at the begining of post.

Thanks.

Until they come out with a bosche platinum 4 for the little china girl I'm going to keep experimenting with performance tips. call me crazy but hey im seeing some power gains