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.



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

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

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.