From what I have seen of the inside of the cylinder head on the Savage, the exhaust ports are THE BOTTLE NECK in the entire system.
The intake and exhaust valves may be a little on the small side but not so much for a street going bike.  Unless you're going racing these valves will be fine.  They will flow enough air, especially with the help of the Performance Camshaft, to make all the power needed for a street bike.  And and increase in compression ratio has not even been mentioned yet.
I was able to get 45 hp out of my engine with my Performance Carburetor Kit, Performance Camshaft, my custom made exhaust system (1 3/4" header with dual spiral core R&D muffler), and the cylinder with the silicone carbide treatment.
The head was still virtually stock, with just a very litte opening of the exhaust port.
Since then, the exhaust ports have been opened considerably more and the cylinder and head have been shaved a total of 0.040" to boost compression, which should result in a full point bump up to at least 9.5 to 1.  I am expecting to see 50+ hp when it is back together.

SteveRocket1 wrote on 01/10/08 at 08:06:22:



This is just my opinion of course, but I have pretty much decided that I would not bore unless there was some damage to the engine that just made it necessary.  I prefer putting the time & $$ into carb, porting, compression and exhaust to improve engine efficiency.

Last year we talked a good bit about pistons to increase size and compression.   Since we were never able to get the exact measurements needed to have the pistons manufactured, I have thought about the alternatives frequently.   I needed a valve job on my newly ported head and decided to have the head/cyl shaved as long as it was in the shop.  The cost of the shave was really cheap, about $40 if I remember correctly.  This was done at a NAPA machine shop.  Nice young fella there; willing to do different stuff other than the hundreds of auto parts he normally works on.  He did say it was kind of challenging figuring out how to mount the bike parts on his machines.

Gary On A Savage wrote on 01/10/08 at 08:42:14:


Gotta tank..see...

thumperclone wrote on 01/09/08 at 17:09:08:

I read the articles when (whoever) 1st posted.  And I didn't understand the reason for a D port vs. a smaller round port then.  I'm fine with the high speed flow and better mixing bit.  Just not how they got there.  No matter what the hole shape is, if you reduce the open area, whether round or D, you should get the same effect.  Round holes are a lot easier to make.  And you don't have to key the valve to keep it from rotating.

verslagen1 wrote on 01/10/08 at 13:13:37:



The seat will be mounted a bit farther back, in the pic  it is just sitting there ... nothing is attached yet.

hi ,

i PM greg about this and reading this topic, i think it is time for a porting topic.

i`m busy porting mine and like to have some feedback.




inside dia of my raask is 49,5mm

it is not ready yet..alittle more around the valveguide must dissapear
and intake will be polished.

Gary On A Savage wrote on 01/10/08 at 19:54:34:



3.3 gal ,,, purchased on ebay, they should still be there.  search for gas tanks for american v-twins, they have the standard shaped one and this version, cost about $149 or 129 I think.