Atc 70 hellllllp pllllllllease !! Im going insane !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[woodyatc]

Hi Barnett, i set the points to 0.4mm, im gona have a go at lowering the needle / jetting over the weekend when im off work, until i bought this trike 3 months ago id never realy done any mechanical work, just ridden bikes realy, if it was'nt for helpfull people / forums like these and the manual id be LOST !!!!!!!!!!!!!!!!!!!!

Thanks again.

[barnett468]

Hello

Yes that's good however you still haven't answered my rececent questions. Might be nice to know how it's starting now choke etc. I just had an epiphany, does your son rev the motor out, if so the plug should not be black howver if he rides it around slowly in too tall of a gear then the plug will be much darker. He should not bog the motor.

[woodyatc]

Hi Barnett i have'nt made any changes to the trike yet since i last started it (on the old carb rebuilt and reinstalled) thats when it started with next to no choke, it wo'nt start if it has too much choke on, but starts easialy on no choke or next to no choke, my son doe'snt over rev the engine, he usualy just rides it easy never realy go'es above third gear.

[barnett468]

Hello woody thanks

Thanks for the info. So you are saying you have started it a few times now and it is the same each time and it is ok? This would be nice to hear.

Your choke position while starting tells me that if your idle screw is out around 1 1/2 turns you need the next size smaller pilot jet a 35 as previously mentioned.

Lowering the needle and reducing the main will reduce loading up caused by him lugging the motor like he is. They don't like that.

Let's reduce the main only one size instead and drop the needle 2 positions until you install the smaller main.

AFTER INSTALLING THE SMALLER MAIN RAISE THE NEEDLE BACK UP 1 POSITION. should be perfect for him then. He will gradually rev it more in each gear as he learns which will lean it out just a bit. How about that!

Your online trike dr's are here to serve [sometimes] lol

[woodyatc]

Hi

Yeah its started a few times now (always roughly the same very little to no choke, a little revs)
idle screw is around one and a half turns out
Im gonna get on with the needle and jetting as soon as i can
Im just glad its starting and running ok again (fingers crossed it stays that way)
I'll be happier once its running less rich though, thanks again for all your help

[barnett468]

Great thanks always nice to hear back when one succeeds. If we had failed no need to bother, lol. That was a tricky one.

Drop the needle now at least or it will keep loading up the plug!

[woodyatc]

Hi

Im gonna get on with lowering the needle on the weekend, also gonna clean and reoil the air filter (would it be worth adding an addative to the fuel to help clear out the carbon build up ?) i'll get onto the jets also when they arrive, my sons gonna be out riding the little trike over the weekend so i'll report back on how its running.

Regards

Gav.

[barnett468]

Hi

Im gonna get on with lowering the needle on the weekend, also gonna clean and reoil the air filter (would it be worth adding an addative to the fuel to help clear out the carbon build up ?) i'll get onto the jets also when they arrive, my sons gonna be out riding the little trike over the weekend so i'll report back on how its running.

Regards

Gav.

Hopefully you know to use foam air filter oil not motor oil. Too much and it can't breath and will load up again. I'm afraid to add anything to it just yet but you could use just half of what the gumout bottle says etc.

[trike savior]

just gonna chime in here again and ask you to please look at the float first woody. ive had your exact same problem with one of my bikes and it was because that plastic float was wore out and hitting the carbeurator body. it will still shut off fuel so the carb wont overflow and leak but it will cause it to run rich because there is too much fuel in the bowl. i really think your jetting problem is solved by finding new carb had a 70 something jet and old a 50 something. i think the 50 jet is where you need to be. i should be playing with my bikes today ill pull the carb on the 70 and get you some info like i said i would

[woodyatc]

Hi

Im gonna pull the carb and air cleaner tomorow and have a look at both the float and the needle i'll let you know what i find.

thanks

[woodyatc]

Hi Trike saviour / Barnett

I pulled the carb ? air cleaner today

Cleaned and reinstalled the air cleaner

I checked the float as you described (and it was past the horizontal, not hitting the carb body though) so i installed the float and needle out of the new carb into the old carb, and it now sits horizontal

I also lowered the needle as described and fitted a 35 pilot jet (have'nt managed to get hold of a main jet yet

cleaned the plug and put it all back together, it start 1st pull (again on no choke) setteled to idle almost straight away, ran great.

Ran it for around 30mins then stopped and checked the plug, plug still a little on the black side but no were as near as it was, not sooty at all

so i guess its still a little bit rich ? but now starts easialy and runs great

I'll keep on the look out for a smaller main jet and see how it go'es with that

Many thanks once again for all your help and imput GREATLY APPRECIATED.

[trike savior]

sounds good glad to hear its better. one question about the no choke starting though, where do you store bike outside in cold or in your garage, cause if its in a garage chances are its warm enough and you wont need to choke it. try leaving outside overnight and then try starting it.

if its kept outside u might continue jetting

[woodyatc]

Hi trike saviour

Bike is stored in a garage.

[barnett468]

Hello Woodyatc

Trike savior asks a very good question that should be considered so I will tell you how the Mfg’s eliminate the indoor vs outdoor storage question using a painfully simple approach. Glad you got your float level set as he suggested also. I knew it wasn't "out of spec" by any great amount if any simply by your latest starting, driving and plug check tests so I didn't feel a need to bother wit it but it's good to know exactly where everything is for sure.

Here’s a very brief and incomplete explanation of how most mfg set up the choke and pilot jet settings but it should be enough info for you to understand as well as you need to.
The Mfg’s set everything to work best at approx 65 degrees [or 18.3333333 farenheit] for you guys. At 65 degrees they want ½ choke to be required for best starting. Some of the old manuals said this in the starting procedure” section. I’m sure you can figure out your pilot jetting on your own using this basic rule of thumb.

I was fortunate enough to visit Europe including London and therefore I have the advantage of knowing what your temp is this time of year [plus I looked it up on the internet to be sure. I knew there would be some difference between your garage temp and outdoor temp but also know that either way it is not 75 degrees there unfortunately for you therefore some amount of choke should be required to start it if your pilot jet was the correct size for your conditions etc.


Mr. computer says you had a high of [46 degree Fahrenheit ] 7.7777778 degree Celsius today, is this close? If so I personally would say that is a bit more on the “nippy” side than the “balmy” one. Either way your current temps are way to cold for you to be able to start your bike with no choke at all and have it instantly idle. Pretty easy deal isn’t it?

Going from a stock 58 main to a 50 is approximately a 14 percent drop in size and since your jetting now sounds extremely close I personally would just drop the one size and try it. As I mentioned yoir son will get used to revving it a little more which will cure any other rich condition caused by his current riding technique.

I also had another epiphany which is I think you should get a front [countershaft] sprocket that is just one tooth smaller. This will force the bike to turn just a few more revs and will prevent him from bogging the motor with too much throttle at too low of a speed. Sound good?

Thanks

[woodyatc]

Hi Barnett

Yeah your about spot on with the temp (had a few nite time frost recently and cold when i've been starting the trike)

Im gonna get hold of a couple of jets (one and two sizes down and try both)

I get what your saying about the sprocket size, might give that a try also

I also understand that the bike should'nt start so easialy on noke choke when cold, but is this realy a problem ?

Regards

Gav