Big bore supermoto

[Niall-griffiths]

Hi all. I'm based in the uk and now winter is here I want to do some engine work.

Have seen a few Google searches showing Eric can bore and port a 300 cylinder to a 327 can anyone tell me if this is true and any experiences with it ?. Would it be worth getting a carb mod done by rb desighns also?

 

[VxZeroKnots]

Hi all. I'm based in the uk and now winter is here I want to do some engine work.

Have seen a few Google searches showing Eric can bore and port a 300 cylinder to a 327 can anyone tell me if this is true and any experiences with it ?. Would it be worth getting a carb mod done by rb desighns also?

I have no direct experience but the folks who get the house of horse power cone pipe and carb mods/new carb are feeling a dramatic increase in power. Plus it looks trick!

I know that doesnt answer your question but maybe it will give you the power you seek without and dramatic engine changes.

 

[Zman]

I have the first 300/327 GG big bore Eric made. I love it and it runs awesome! It has amazing low end and it makes more power all the way through the RPM range. Initially I thought it did not rev as high as other 300s until I recently changed from the stock brick style CDI that came on the old 2000 and I installed a newer CDI from a 2004 300.

Here are some more details on it.

http://www.thumpertalk.com/topic/81...ne-the-operating-rpm-of-a-gasgas-power-valve/

http://www.thumpertalk.com/topic/751636-gasgas-ec250-to-300-or-yz250/page-2

 

[motopsycho87]

Also interested to know if they're available...!

 

[Capz85]

Niall I'm in the uk and also been thinking exactly the same thing, I didn't know about these big bore kits, I was just going to get the head Machined and port work done and use a lectron 38mm carb

Are you looking to get everything sent from the US ?

 

[Zman]

Contact Eric http://eric-gorr.com/ I am sure he can help you out. He was working through Millennium Technology for a while and he is now back on his own.

 

[Niall-griffiths]

Thanks for replys, will look into the exhausts also. Hi capz, I believe I will need to send my head ect to the us for the work to be done.i will contact Eric and let you know. Zman how much hours /miles have you put on the piston until replacment ?

 

[GGRider01]

Just wanted to say that's a sharp looking bike. Did you just spoke different rims to the stock hubs?

 

[webmaster]

There are some horror stories concerning work performed by Eric Gorr and his customer service - do a search here. One member here had a very, very bad experience.

And I have a personal friend who also had an extremely poor experience - what was returned was not usable.... Bad stuff...



jeff

 

[jimjim]

Engine porting really wakes them up,mated with a lectron hard to beat.

 

[Zman]

You need to remember there are two sides to ever story. I was surprised by that story you mentioned so I did some additional searching and I actually found a response from Eric on another site and it painted a very different picture of the situation.

I have been sending work to Eric Gorr for the last 10 years he has always been professional, knowledgeable, and I have found his work to be very high quality.

 

[Zman]

Regarding my the piston life in the 327. I am about 3 years (`45hrs) into my second piston. I believe I had about 80 to 100 hrs on my first one. It started to get a little louder so I replaced it. I have been running Klotz R50 oil.

 

[Niall-griffiths]

Just wanted to say that's a sharp looking bike. Did you just spoke different rims to the stock hubs?

This is how the bike came out of the factory,

Thanks for the replys I will look into this,how much are the Pistons as I guess they are custom made ?

 

[Zman]

The 76mm piston is a Wiseco and I believe it is big bore piston for an Honda ATC250. As I recall it was <$200.

 

[webmaster]

You need to remember there are two sides to ever story. I was surprised by that story you mentioned so I did some additional searching and I actually found a response from Eric on another site and it painted a very different picture of the situation.

I have been sending work to Eric Gorr for the last 10 years he has always been professional, knowledgeable, and I have found his work to be very high quality.

z-man, I am glad things went well for you. But given what I have seen - I feel a responsibility to warn people. If you look around the web - you will find quite a few stories - too many to write off as "the customer's fault..."

It is not an isolated incident.

Before the GG riders club member had trouble and reported it here - I had personal knowledge of a cylinder that came back "destroyed" by Eric Gorr. Gouges in the cylinder walls (got wild with the die grinder/porting tool) , the power valves "had the shit ground out of them" and required replacement. Gorr eventually did supply a used replacement cylinder and power valves - but it took a bit for him to answer phone calls. Only after I told my friend how to block caller ID did he start to pick up the phone. (He wouldn't pick up the phone if he saw it was my friend calling about the damage he had done...)


jeff

 

[Zman]

I am sorry to hear your friend had a bad experience. The work Eric has done for me over the last 10 years has been great and I will continue to use and recommend his work.