http://www.vpprousa.com/images/stori...product/V2.jpg

Now available: The new Arrow GTR-21 V4 Engine.

This is the same engine as the V3 but now includes the 3+2 Port Plus 21 piston and sleeve for even more power and better fuel efficiency. It also has a revised carb with additional cooling fins for a more reliable running engine.

http://arrow-racing.net/temp/pic02_4.jpg

In stock now at VP-Pro USA.

yeah, like i said it was the first gen one. it runs great now :) not quite as much power as i would like but i got it cheap online so im not too worried

Ran one of these in my buggy for a season. Thing ran great, tuned great, and smooth power. Got my monies worth out of it for sure:D

Mine stil in break in mode, what is total shimming after break in for 25% fuel?

1 gold and 1 silver shim. If you need more top end you can add another gold shim.

It come with 2 silver (.2 n .3) shim n 1 copper shim (.1)

It comes with 1 silver and 1 copper installed, and 1 extra copper.

Guess manufacturer got me the wrong shim. So after break in, use silver+1copper only for 25%

Any other matching pipe for 5port?

Hello?
Any recommendations for 5port PIPE?

Anyway how to post pic here?

The GO 2103 works pretty well imo, I´m liking it better than the 2072. Have you tried it?

What differences did you find between the 2 pipes, I have the 2072 on a GO engine with alot of bottom end but also good mid & top, I find the 2072 gives a good spread of power right through the rev range but I probably have a little to much down low for my driving.

Well I like to drive smooth and the 2103 gives you more top end and a smoother feel overall, guess it also depends on the engine you are running too. I have not done back to back run time tests yet but looks pretty similar to me. Besides I like the "OS Style" sound of the 2103 better :lol:

Thanks for that, I was told a while back on this forum that the 2103 had less bottom & more top end but when I went to purchase one, the online store said it provides more bottom end than the 2072, so I rang the shop & they weren't sure so I got another 2072.
My engine is modified with lightened crank & timing etc all done & is probably better in a truggy not buggy. I was after something that provides slightly less bottom & similar or more mid & top, I was also thinking about the Werks 2058.