You are too rich on the top end by the sound of it. Come in 1/16th of a turn at a time on the HSN until you get clean running mid range and up to WOT. Now go back and reset the bottom end for a crisp take off. The HSN is very sensitive and only needs very small adjustments. The difference between what you describe and a good top end tune is probably only 1/8 to 1/4 turn max. Just go 1/16th at a time and test it with a run after each adjustment until you get it right.

Read the tuning tips on our web site suggested by sriley. If you have any problems just PM me

but the problem isnt the hsn. i lean it anymore i get the lean bog.

i need to get ahold of the team leader in texas asap 214-779-1824

im having the same problem with mine right now, give it gas and it cuts out! have to blurp the throttle to get it going. still cant fint the problem, i know it not a tuning issue, i know how to tune.

I had that happen to me before. I am not 100% sure in my case,I took the fuel filter out,replaced the line,replaced the cracked exhaust seals. I also took out the needles and cleaned the holes with nitro cleaner. this was on the older carbs with out nitrile seals. Engine ran great, then I put filter back on air bubbles,bad seal in filter? I had a jammin x-2 that had the seal on the fuel tank cap go bad that caused same problems. On my mg-66 when it dropped it's nuts same thing. Took out break in shim,put in new plug retuned,still runnin like a raped ape!!! hope this helps.

im going to go through the hole thing this week, install new tank, seal carb and back plate (again) new plug, try differnt carb, see if that does the trick. if not, guess ill put the v-spec back in

If you have already checked every thing out,just put in a new plug and see how it runs. One last thing,make sure head bolts are tight. I've pulled that one before. I have found with go-tecs if you take apart,clean,seal, you really never have anything go wrong with them. At least that's been my experience. I always would think whats wrong with the engine when in fact it was always some thing else. Here's my last goof. Had fuel line coming from filter a bit to long. rubbed a very tiny hole in the line.Engine running funky. I checked every thing. Finally just got pissed replaced all the fuel lines found problem. I had even ran my had over it. But from what your describing sounds like fuel restriction of some sort. Good luck!!

thanks for all the tips!! ill go through it and let you know what, if anything i find. when the engine runs well it screams, very happy with the GO engines, not ready to give up just yet. has to be somthing stupid im sure!

If it coughs and splutters then dies on acceleration it is quite often the plug.
If it was running good before and it has gone south without you touching the needles it will be something external for sure. Once tuned these motors usually hold their tune very well.

808gx7R - make sure you have re-set the bottom needle to flush from when you screwed it in so far, or you will get lean bog when you lean the top slightly. Start top needle flush, bottom in 3/4 turn from flush. Lean HSN in LITTLE steps until clean running at WOT then lean bottom for good take off.

If that doesn't work you may well have an air leak somewhere, or some dirt in the HSN jet, which will cause all sorts of crazy tuning problems. Pull the needle and blow out the needle seat then tune as above again.

i dont beleive its a tuning issue, i would not think its a front bearing or anyhing either as the engine is fairly new, going to try differnt carb first (easy to check) if not that change tank (have a spare) if not that then, maybe differnt plug, running p3 now

I have a go 0801 pipe with little use on it and the button on the front that the wire attaches to broke loose. It goes in and out of the pipe freely. Couple questions, 1. Is there anyone stateside that can or will warranty this? 2. If not are the pipes aluminum? I think it would have to be tig welded to repair. I've been considering trying jb weld but I'm afraid it wont hold up.

Thanks,
Brian

is there room to drill new hole? are you talking about mounting hole at front of pipe? there are a few fixes for it if you are talking about what i think you are, maybe post a pic here, that would help out alot for a awnser to your question

I'll have to work on the picture tomorrow. It is not just the hole broken out but instead the whole..... ?nipple? is broken out of the front of the pipe. The hole is still perfect! The worst part is that I just finally matched this with our gen5? 7 port and it was silly fast even with a 6mm restrictor. I'm really starting to think that matching the pipeset and engine is critical. Easier to tune,runs better and better mileage, maybe pressure related? idk, maybe it's just me.

I know the go engines are awsome!!!!!!!!!!!!!!!!!!! guys at my local track have seen mine run and want to know where to get one, they are currently running OS .21 V-SPECS and the go engines will pass them like they arnt even moving!!!! no joke!!!! i am the only one running one at local track and is very impressive!!!