First 1/8 race of my Career comming up!

[godale03]

Hey Guys,

I have a question for you guys I was hoping you could answer. I am 7 tanks into the break in period on my Xterm w/ OS RG X. Our first race of the season is this Saturday afternoon. Is it too early to start thinking about racing the buggy just yet? Should I run a few more tanks through it first? I was hoping to be ready to go by this weekend, but as those of you who read my posts last week know it has been a struggle to get the girlfriend to give me the time to break it in. So I am now a bit behind schedule. I just want to make sure I don't damage anything. Thanks guys.

Tom

 

[Plaidfish]

Do it...have you been doing any WOT run yet...you should have by now.....it's an RG dude....just make sure you bring the piston to BDC every time it shuts off and it'll run good......

 

[godale03]

Do it...have you been doing any WOT run yet...you should have by now.....it's an RG dude....just make sure you bring the piston to BDC every time it shuts off and it'll run good......

I have been doing some short WOT runs but not holding it for more than a few seconds. I think it is still running a bit rich and I think idle is set to high. The last 2 tanks I ran through it I did not let it sit after it cut out. I restarted it and kept on running. Probably a big mistake but I am under the gun to get this thing broken in. I know, I know, you have to be patient with the break in time. I am having a bit of a hard time with it shutting off when braking and I am not sure how to correct it yet. It doesn't cut off every single time but it cuts out enough to have me worried. I don't want it to cut out on me during the race. Now when i was done the second tank, and after every time I am finished running it I oil it up and put the piston at BDC. I have not run the bug with the body on it yet because of the constant cutting off when braking so my temps have only been in the 190 range still too cool. I don't know. I was just anxious to race.

 

[JESSE G]

I hope your able to get it tunned in and go out there and woops some ares lol, Good luck man!

 

[AC48]

Just race it. Try and get as much through it before you race as you can. That way it'll get more broken in and ready to deliver power at higher rpms and such. From what I hear you really can't mess up an RG too bad.

 

[Plaidfish]

lean it out now dude you NEED the temps to reach 200 during breakin....run a few tanks like that.....will it idle for more than 20 sec w/o shutting off???? you might be too rich on the LSN and that's what's cutting it off when you brake...the sudden rush of fuel is flooding it just enough....if you brake and hit the gas does it sound like it's clearing out??? if so lean your LSN like a hair until it stops stalling....if it's just shutting off as soon as you hit the brakes open the idle up a little......that's the little screw just to the left of your LSN...sort of underneath the screw housing on the carb.....then if I lean out the LSN I usually crack the HSN a little richer...about as much as the LSN got leaned cause the HSN is more affecting the overall temp......

 

[Ryan with savage]

Lean it up and give it hell.

 

[Ericke1]

Be careful about leaning out too much, this can melt your connecting rod

 

[godale03]

lean it out now dude you NEED the temps to reach 200 during breakin....run a few tanks like that.....will it idle for more than 20 sec w/o shutting off???? you might be too rich on the LSN and that's what's cutting it off when you brake...the sudden rush of fuel is flooding it just enough....if you brake and hit the gas does it sound like it's clearing out??? if so lean your LSN like a hair until it stops stalling....if it's just shutting off as soon as you hit the brakes open the idle up a little......that's the little screw just to the left of your LSN...sort of underneath the screw housing on the carb.....then if I lean out the LSN I usually crack the HSN a little richer...about as much as the LSN got leaned cause the HSN is more affecting the overall temp......

I am going to try a run with the body on and then check my temps. If they are still low I am going to lean out the HSN another 30 degrees and try it again. I know I am idleing to high cuz the car tends to move by itself after it gets warmed up. The Buggy does run for more than 20 at idle without shutting off. Once it gets warm I can even punch it and it will go without cutting off. It is still a bit sluggish though. I am not real sure what you mean about it sounding like its clearing itself out. Still a noob and until someone points out how something is supposed to sound I am still kinda clueless. I can tell the difference in performance everytime I lean it out, but other than that I am kinda just winging it.

 

[Plaidfish]

if you let off the gas and it sits for a while does it start to sound like it's gonna die, then you blip the throttle and it sounds good again for a few seconds....that's clearing it out...the fuel is building up faster than you're using it until you open it up and use that "stored" fuel......when you open the carb you burn that fuel quickly....if there is too much it just floods out and dies.....if it's sluggish on the bottom you need to lean the LSN a little....30 deg is a lot to go on the LSN...I go like an hour at a time on LSN tuning.....as long as it sounds good at WOT and your temping less than 240 max on the RG you should be good on that screw....LOL..I just realized 30 deg = 1 hr on the clock...I are engineer....duh.....so you are doing good

 

[godale03]

if you let off the gas and it sits for a while does it start to sound like it's gonna die, then you blip the throttle and it sounds good again for a few seconds....that's clearing it out...the fuel is building up faster than you're using it until you open it up and use that "stored" fuel......when you open the carb you burn that fuel quickly....if there is too much it just floods out and dies.....if it's sluggish on the bottom you need to lean the LSN a little....30 deg is a lot to go on the LSN...I go like an hour at a time on LSN tuning.....as long as it sounds good at WOT and your temping less than 240 max on the RG you should be good on that screw....LOL..I just realized 30 deg = 1 hr on the clock...I are engineer....duh.....so you are doing good

LMAO... yeah I remember the first time someone told me to move the needle 30 Degrees.... I had the same reaction so don't feel bad. It is good to know I still have not killed this mill yet... I am curious to see how the temps do when I have a little more of the head under the lid.... Like I said before I have been running with the lid off. I will lean the HSN and drop the idle a bit and see how we do..... Do you think maybe the opening at the carb is too large at idle? Do I adjust that with the idle screw,or the trim on the radio?

 

[Plaidfish]

always use the screw unless you are on the stand....if you zero out the radio then you can idle it up via the Tx while you're getting on the stand to race...Unless you have a full time pit bitch.....do one adjust ment at a time though...I'd set the idle screw to open the carb about 1-2mm...about the thickness of a credit card....if it cuts out still, then start adjusting the LSN....remember if your problems are occuring in the start to mid range I try and get theat taken care of w/ the LSN rather than trying to overcompensate w/ overall fuel flow......I tune ass backwards myself...I go bottom up once I get a decent base tune going....I have better luck that way.....and never start throwing screws around til the engine is up to running temp.....make a few WOT passes once you think it's there and temp it every run....you'll get it down sooner than you think......I'm really just inthe last 3 months feeling like I know what I'm doing w/ tuning big blocks..... but I've had some real experts showing me what to look for....I was also born w/ an impact wrench in hand so I do have a good ear for this stuff....just needed to get used to the smaller hobby engines

 

[godale03]

Good deal... I will continue what I am doing and just take my time making just one adjustment at a time. I am sorry to keep asking such dumb questions over an over again, but sometimes it takes a little while to catch on. When you say to zero the radio out... do you mean have all the trim settings set to zero? Can you adjust the opening in the throttle with the idle screw while the engine is off? I have noticed that the motor sounds a bit better the more I have been running it. The tune just sounds so much better. I am still getting good smoke so I know I am no to lean yet....

 

[Plaidfish]

yes it's easier to adjust the idle when it's off but itdoesn't need to be....actually it's easier to turn the screw when it's off but it's easier to tune w/ it on....set it on the box...pull throttle trigger a lil so you take pressure off the idle screw.....adjust it and wait a few seconds to hear how the engine changes sound.....mine seems to like to idle a little high...I just let it stay like that...it's not rolling on the ground but close to it.....if I pick it up the wheels start spinning but no torque behind them.....

 

[godale03]

Cool Beans.... I will give it a shot. Thanks again Plaid and crew for the great advise. Going for broke this weekend... time to show these folks the new kid in town.... :hammer:

Tom

 

[OFNA buggy basher]

Hey i got a quick tuning ? also. When i start up my hyper 8 port and take the igniter off it dies? Which needle do I need to lean? Its spitting out raw fuel and i can't even ease into the throttle without it dieing? I'm just coming off break in and thats y its so rich.

 

[Revo Rancher]

OFNA bb, lean the HSN, and it might take a lot of attempts, too. Run it up and down the street after each adjustment until it will take all ranges of throttle without cutting off or bogging.

Tom:

Plaid has you going the right direction. If you lean the LSN, which it sounds like you need, then remember the idle will go up, so then lower the idle via the idle screw. Of course, on race day, the weather might be all different so heck, this all might not be the right advice by then!

 

[godale03]

Hey i got a quick tuning ? also. When i start up my hyper 8 port and take the igniter off it dies? Which needle do I need to lean? Its spitting out raw fuel and i can't even ease into the throttle without it dieing? I'm just coming off break in and thats y its so rich.

Hey Ofna,

It sounds like you are definitely too rich. First off... did you change the glow plug after you completed your break in runs? I always do because as rich as you run during break in it generally will foul a plug pretty quick. Second start by leaning the HSN and making a few runs. Are you still at factory settings with the HSN? If you have leaned the HSN out a few times (30 Degrees) and you are still running rich lean the LSN about half an hour and then give it a shot. After break in you are still very rich. Hope this helps. Let us know how it goes.

Tom

 

[kx250ryder]

You said your car stalls under braking, try checking your throttle linkage. When I first got my car, the previous owner had set up the throttle return spring wrong. It would return the carb. slide to what seemed like a neutral position when you let off the trigger, but when you hit the brake, it would close the carb. even further, causing the engine to idle down/die under braking.

If you haven't solved your problem with the solutions in previous posts, try taking off your air filter (while engine is NOT running) and make sure the slide is moving properly.

 

[Plaidfish]

Kx it sounds like you need to open up your idle a little...there is no way a servo linkage should close the carb more than what your idle screw sets it to....If someone showed you that and said it was from the linkage they need to learn the basics of the 2stroke nitro carb.....