Max, thanks for the info.. So the stats you are using are based from a shop that was busy in the 1970's and 80's? With that information , in mind, wouldn't you agree that technology AND troubleshooting, based on a better understanding of the 2 stroke engine, has come leaps and bounds since that air-...

Since about 90% of piston seizures are caused by jetting issues Max, can you tell us where you get this statistical information? I can't seem to find any of these facts. As for stingers causing engine failure.. Let me share some of my experience that pertains.. I can run brand "X" silence...

Ed,, good points.. I just want to clarify, that the stock pipe MAY be fine.. but if you have a silencer that is restrictive (like a spark arrested one would be) then you could have as big of stinger as you want--->> but stuff a banana in the tail pipe and the heat can not escape.. Try putting a Car ...

Max, again.. you directly stated that the stinger is not what is causing the issue.. So this tells everyone reading that you have it figured out and you are right and everybody else is wrong.. If that is not the definition of "discredit" than I am not sure what is? Full Definition of discr...

I don't see a separation of the oil/fuel mix in such a short period of time. Everything should be lubricated by the fuel/oil mix. Lack of lubrication is a function of jetting and fuel/oil mixture. I don't see separated oil migrating around the engine. Why would the oil stop and start migrating, one...

Danny.. here is an article, I wrote years back,that addresses the back pressure .

http://www.2strokeheads.com/techcans.htm

Kels thinks this is the way it is..

Max... Think about this--> You can not seize a piston unless the oil barrier breaks down. So, in the end, ALL seizures are the result of the oil barrier breaking down. The real area to investigate is WHY this oil barrier broke down? As mentioned earlier, oil MUST fall out of suspension in order to d...

Danny... the too tight of stinger possibility is directly related to the lack of oil on the exhaust side skirt.. When you have this condition, the heat builds on the face of the piston and the oil, if not sufficient, gets removed and this type of scoring occurs. In short, the heat cannot get out qui...

Here is something that is going to spark some controversy regarding what information you can "source" from a plug color color reading using a modern oil. The old days of "color" telling you much information lost a lot of validity when oils took an advance in technology. In short....

Without seeing more of the piston.. I would say that you have too tight of an exhaust stinger.. or a silencer that is restricted. Also shows a little sign of an slight over-heat... I would also run 20:1 on the oil... What oil ratio were you running? The oil migration topic is interesting.. there are...

I would agree with Ivan.. Of course, how well the clutches are "hooking up" and how smooth the tranny is working would be factors... But I suspect the losses would be in the 25-3-% range on the 125 engine...too bad nobody has a dyno that can attach to the crank. At the end of the day.. Dou...

here is an idea that might help for getting your bike to you.. There is a HUGE snowmobile event in the Minneapolis are coming up Sept 11-13th. People from allover the USA attend this event.. many vendors from UT attend and are hauling trailers that may have space for your bike.. There will also be m...

DGardner wrote:Keep it up and I'm going to punch you in the throat!

Pic from your Maico Years..

DGardner wrote:Okay I found a photo of the piston.

Doug you left out the "Doug" part of the piston.. I have corrected it for you

Dynos are a tool and can be made to produce any number you want it to. Having said that, this dyno is 100% neutral and the owner is honest. There would be no reason to falsify any data. Doug's engine show about a 60% increase in HP output over Roger's and as stated by Roger, this added HP manifests ...

In an earlier message Kels says "The bike is now running well.. We will not get into what needed to be changed to make it run well, but I , for one, am happy to know that Doug will be able to make the trip." Even if you won't say what changes were made to get the bike running well, can we...

Got it.. Pm'd ya back

Kelsey, You are new to the forum (I see you joined May 11) so you may not know how things operate here. If you click on recerclam's name there is an option where you can send him personal messages. This forum was set up by Strictly Hodaka for folks to ask questions and get help from others that may...

OK doug , I didnt say you needed a 36mm carb but that I was using one and larger would be a plus, also that Mine uses a combat wombat pipe and head , and it works great with lots of bottom and mid . Said I had no experience with thew circle f pipe. I suggeated you just throw the pipe on there to tr...

I don't think it has been stated but what cylinder was on the bike that was producing all this speed and horsepower. I remember you said it had some porting done by RK Tec. Just wondered how wild the port timing was on it. I will mentioned that the case and cylinder porting Rich did for me made min...

Shorty.. I think assuming that this cylinder/case combo was just thrown on there, engine started, and ran would be an incorrect assumption on anybody's part. Almost 2 full days were spent trying to get this engine to gain back the performance that was lost.. Doug was on the phone constantly with the...

Yes, with any 2 stroke.. every change made will effect every other area.. But with this particular build ALL that was changed was the cylinder and case work.. Flyingdg adjusted timing and jetting to TRY and get this new "TORQUE" engine to produce the "torque" .The only thing thes...

Ok Im trying again. First nobody says this cylinder is for trials use ! Ist for crusing down the Highway . Tthe transfer volume seen here does NOT! take away bottom end but will help with torque regardless of where the port timing is put . Aah... With all due respect.. This is simply not true! To g...

Does anybody else think that these cylinder alterations are not conducive to a low end power increase?

Second thing: detonation isn't caused by hot spots. That would be pre-ignition. Detonation is a flash burn started by a spark plug at the right time, flame spreading at a given rate, and then something upsets the balance, usually in the squish band, and the flame front goes from sedate to exponenti...