Originally Posted by
jediwannabe
Hi go community!
I'm still undecided on these GO 3 rspec motors...
My brother and I both run them. We've been running them for a few months. We have 4, 3 port motors now. I've resleeved my first motor a broke that back in. We've experienced most of what is discussed in this thread. The pinch is insane when they are new and break in does take a while, but our motors have been losing there pinch after about 3 gallons of fuel (Byrons gen 2 30% with 11% oil). I don't know how people are getting 7-10 gallons of fuel, unless they are talking about the 5 and 7 ports.
Hey Jedi do you mean the pinch is gone or the compression is gone, as there is a big difference.
Eg pinch is when your piston is still binding with the sleave at the top of the stoke (TDC top dead center) and compression is what your engine requires to burn your fuel effectively.
the way to tell the difference is to remove the glow plug and turn the engine over with your hand, if you feel resistance at the top of your stroke or the piston binds then you still have pinch, if there is no resistance then the pinch is gone - this is what you want as you should not be race tuning an engine until the pinch is gone.
to check compression put the glow plug back in - with the engine out of the vehicle and no pipe assembly on hold the engine by the flywheel and tilt it to about 45 degrees then gently rock it about 1cm- 1/2 an inch the engine should be able to hold its own weight if it doesn't then the compression is gone.
I hope your not resleaving your engines when the pinch goes as this is when you should be starting to race tune.
Originally Posted by
jediwannabe
The carbs have been tough to tune sometimes...I've learned to be very careful with the HSN not to bring on the lean bog. I've also had the O rings in both needles start to come apart on every carb i've had so far. Not a difficult fix but it sucks if this happens during a race weekend and your scrambling to try and figure it out 10 mins before the main.
I've also blown many glow plugs at the track trying to get the motor tuned and maybe the LSN was a tad too lean. We run the 086 pipe and tried several different plugs Odonnel 99T, OS P6, Novarossi. I might get 7 min on a good day running a 150cc tank in a buggy.Temping 240-250
If your trying to race tune while you still have pinch this maybe causing your low end bog, high temperatures and low run times
I've never experienced O rings breaking down. I'm getting around 9.5 mins of run time using 25% Nitro 7.5% oil with 0801 pipe Novarossi No.6 plug 125cc tank in a losi 8
Hope this helps Adrian