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General => Technical | How To => Topic started by: Peters on April 04, 2012, 08:07:33 PM

Title: Is my engine getting too hot with 70cc BBK?
Post by: Peters on April 04, 2012, 08:07:33 PM

I've been having issues with my People 2t BBK. When I am asking a lot of the engine(mostly WOT) it will cut out and sound like sh**. Then it doesn't want to run right until it cools off completely. When I put the BBK on I put the plastic engine shroud back on with 4 holes in the top for cooling. Is the engine not getting enough fresh air because of that? Has anybody else had cooling issues? I thought it may be my jetting at first. I opened the main 1 size and it seemed to help very slightly. I don't think I'm lean but I could be wrong. I am considering opening it up a little more. I really need to do some plug chops. Just having trouble finding the autolite 4092 I used to get. They don't stock them at my local auto stores anymore.

Title: Re: Is my engine getting too hot with 70cc BBK?
Post by: zombie on April 05, 2012, 02:16:59 AM

NGK br8hsa is the cross over. If you can get br9hsa in your area use it. If not you can get them anywhere in Europe/Asia. I order 6 at a time from Jiangwayne as it is what I use in the Z (colder plug). Repair the holes, and seal all of the shroud TIGHT. Zip ties or whatever it takes. SMART guys figured the fan/shroud combo to work. cutting holes eliminates their work. Your description does sound lean so try a NGK br8hs for chops. It fires closer to the head, and reduces piston temp.. That will show the mix better
Ps You can get a HI flow fan almost anywhere for 15 bucks. I Had one but it blew apart in 3 months so I still use the OEM.   You saw my thread about melted pistons right?

Title: Re: Is my engine getting too hot with 70cc BBK?
Post by: Peters on April 05, 2012, 02:38:04 AM

"SMART guys figured the fan/shroud combo to work"

No sh**!  :-[

I feel dumb now. I'll cover the holes right away.

"You saw my thread about melted pistons right?"

No let me see if I can find it

Title: Re: Is my engine getting too hot with 70cc BBK?
Post by: zombie on April 05, 2012, 03:22:45 AM

There's nothin it worth looking at. Just saying the fan IS important the way they made it.

Title: Re: Is my engine getting too hot with 70cc BBK?
Post by: Peters on April 05, 2012, 06:27:17 AM

So run br8hsa for normal use and br8hs for chops?

Title: Re: Is my engine getting too hot with 70cc BBK?
Post by: zombie on April 06, 2012, 12:07:18 AM

That's the way I do it. I use 9's tho. The 9hsa isn't available in the US so I don't waste them on chops. Plus the hs sits closer to the head and will read leaner so it is a better gauge. When you go back to the hsa you will be just SLIGHTLY richer looking which is a GOOD thing