godzukihop: your hyper 12 is ready
02-24-2009, 10:45 PM
#1
Tech Regular
Thread Starter
godzukihop: your hyper 12 is ready
Bro., your engine is ready for racing now...... 
02-25-2009, 09:40 AM
#4
Tech Regular
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02-25-2009, 09:41 AM
#5
Tech Regular
Thread Starter
02-25-2009, 10:51 PM
#7
Tech Regular
Thread Starter
02-25-2009, 11:38 PM
#8
Any timings canged ?
Looking at the crankshaft I think not. If so then it is a nice job but forgot to sharpen the closing end.
Looking at the crankshaft I think not. If so then it is a nice job but forgot to sharpen the closing end.
02-26-2009, 03:21 AM
#9
A well known engine manufacturer has this remark in there product information: (source: novarossi.com)
Yet engine tuners do the exact opposite... 
The crankshaft is grinded to increase the mixture flow
02-26-2009, 10:48 AM
#10
Ok, this is probably getting me flamed again, but I do NOT see ANY modifications to that engine, other than a nice polishing job, which will do almost nothing for the engines performance, in some areas it will even hurt performance.
No timing change on the crank and none on the sleeve.
The teardrops won't improve the performance in a noticeable way.
We had a guy at our track who modified his engine after pictures he found on the web. Looked about the same but wasn't the least bit faster.....
No timing change on the crank and none on the sleeve.
The teardrops won't improve the performance in a noticeable way.
We had a guy at our track who modified his engine after pictures he found on the web. Looked about the same but wasn't the least bit faster.....
02-26-2009, 02:12 PM
#11
Ok, this is probably getting me flamed again, but I do NOT see ANY modifications to that engine, other than a nice polishing job, which will do almost nothing for the engines performance, in some areas it will even hurt performance.
No timing change on the crank and none on the sleeve.
The teardrops won't improve the performance in a noticeable way.
We had a guy at our track who modified his engine after pictures he found on the web. Looked about the same but wasn't the least bit faster.....
No timing change on the crank and none on the sleeve.
The teardrops won't improve the performance in a noticeable way.
We had a guy at our track who modified his engine after pictures he found on the web. Looked about the same but wasn't the least bit faster.....
02-26-2009, 02:59 PM
#12
02-26-2009, 03:07 PM
#13
well an easy one is the crank....look at the end that the piston attaches to in the first picture and then in the second....you will see that there is a notch in it. Also look at the ports in the sleeve in the first picture then in the rest. U will notice that there have been notches put in the corner....what this does i couldnt tell you but there is a very distinct difference in the original and the modified
02-26-2009, 03:56 PM
#15
The main performance of 2-stroke engines comes from the timings in combination with the exhaust. Flowing does help a tiny bit for an easy running engine but it does not boost any performance, even the silicone insert is a meaningless hype.
A nice book you can search to with google to download is is the "Jennings 2 stroke tuning guide"
But hey, if you want to pay for such work I will not stop you but I like to say that a very tiny change to the cranktiming which anyone can do by himself will do more to the performance than this (I must say) nice piece of work.
A nice book you can search to with google to download is is the "Jennings 2 stroke tuning guide"
But hey, if you want to pay for such work I will not stop you but I like to say that a very tiny change to the cranktiming which anyone can do by himself will do more to the performance than this (I must say) nice piece of work.