[andy graham]

swedetech prepped cylinder @ fastech for around $470 less 10% for the Supernats sale makes that about the best deal I’ve seen…if you want just bare cylinder, no plugs, try partzilla.com for parts, I’ve ordered many times from them with no complaints…99 cylinder is $271.95 from them…that Fastech deal is the best, make sure you mention the 10% off supernats sale to get the discount…its posted at the top of his homepage

[Patrick Roth]

Freddy,

I have a DDR prepped cylinder kit which is less than a year old.  While it isn’t brand new I never had a failure and is definitely going to be cheaper than new.  If interested shoot me an email at proth0303@gmail.com.

Patrick

[FREDDY SANDOVAL]

Thank you, guys for your input

I will take both suggestions into consideration

Thanks a lot.

Oh! One more question, before I repair my engine, and keep from happening again.

What would cause my piston to get melted on top, right at the exhaust port? Missing about 1/2 inch.

I currently run a Pump Around carb, double pump system, 55 and 170 jets, 6 oz to the gallon pre mix. Etc.

[Mike Burrill]

Not sure if it is stock legal but you could send the cylinder out for replate.  I had Millennium Technologies fix a couple for me and they came out great.

[Patrick Roth]

It sounds like you were too lean on the main jet.  What does the spark plug look like?

 

[andy graham]

you need to figure all that out before you spend a dime on parts…otherwise it’ll most likely happen again and you’ll have wasted your money

[FREDDY SANDOVAL]

Andy, Patrick, and Mike.
All your input is greatly appreciated. And yes, I will totally figure out what went wrong before I go back together with new or used parts.

Patrick, The spark plug looks dark grey inside the electrode, but the gap got bent with all the contact it made with pieces of ring and chunks of the piston.
However it is grey in color, but not wet

[Michael LaGrone]

Your jetting will change depending on weather conditions, fuel and elevation.

That being said with out providing a lot more detail in terms of the conditions. I run a 99 stock moto with a dual pump around system and a 170 main will only work at high elevation and a HOT day. Chances are that your main is to lean. I run a 175/55 as my starting point. I have stuck my motor before and it has always been related to a lean condition. Fatten it up… start with a 178/55 or for a new top end break in try a 185/55 make sure to get it up to temprature before hitting it. a little on the hot side is better that cold. Bring the temp up to at least 140 degrees then run it at about 125-130 degrees.

look at this article

http://www.swedetechracing.com/tech_tips/tech_tips_cr125.html#Area%20break_in

Mike

#16 NCK Stock Moto

 

[FREDDY SANDOVAL]

Thank you, Michael
That makes a lot of sense, especially when running Laguna Seca in January.
It will still be cold out there, and there is some elevation as well.

Very good info, Thank you.

[Author]

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