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Old 09-08-2011, 03:30 PM   #2746
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Hi

Just wondered if anyone had any tips to get this motor to run on the AT Racing Platinum 16% nitro racing fuel. I have just finished running it in and first time on the track it would do half a lap and then die.

I am using a Novarossi medium plug...

I noticed idle would increase in rpm and going richer on LSN didn't seem to make any difference. I previously used a cheaper fuel from my local hobby store in my picco, maybe I am not advanced tuner to use race fuel

Thanks in advance
Andrew
you my have a leak check the back plate the s12x3 i had was alittle loose
and that was it ran great at 250f.
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Old 09-08-2011, 04:08 PM   #2747
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Originally Posted by Bundy_Bear View Post
Hi

Just wondered if anyone had any tips to get this motor to run on the AT Racing Platinum 16% nitro racing fuel. I have just finished running it in and first time on the track it would do half a lap and then die.

I am using a Novarossi medium plug...

I noticed idle would increase in rpm and going richer on LSN didn't seem to make any difference. I previously used a cheaper fuel from my local hobby store in my picco, maybe I am not advanced tuner to use race fuel

Thanks in advance
Andrew
Check all the screw and fuel line. Sounds to me like you may also need a hotter plug, this fuel may have a different oil content then the last stuff you used it looks pretty heavy on oil at 15%. Richen the top an bottom up and start all over tuning the top and the work on the bottom,
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Old 09-12-2011, 05:58 PM   #2748
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I haven't changed the head shims to suit 16% nitro yet so i am not sure if this will cause any issues. I also found the HSN to be a little loose from me adjusting it to bring the fuel nipple around.

Hope to be able to try it again soon

Andrew
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Old 09-12-2011, 06:57 PM   #2749
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I haven't changed the head shims to suit 16% nitro yet so i am not sure if this will cause any issues. I also found the HSN to be a little loose from me adjusting it to bring the fuel nipple around.

Hope to be able to try it again soon

Andrew
At 16% nitro you should not have to change the shim. Normally the shims are set for 20%. Basically here is the rule, .1 shim for every 10% nitro, So at 20% you need .2 shims, or 30% at .3 shims.

As far as the fuel nipple you canput a little thread locker on it and that will fix that problem.

Mike
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Old 09-12-2011, 07:07 PM   #2750
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At 16% nitro you should not have to change the shim. Normally the shims are set for 20%. Basically here is the rule, .1 shim for every 10% nitro, So at 20% you need .2 shims, or 30% at .3 shims.

As far as the fuel nipple you canput a little thread locker on it and that will fix that problem.

Mike
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how is the new 833 engine
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Old 09-12-2011, 07:15 PM   #2751
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how is the new 833 engine
I have not tried the 833 yet, by the looks great.
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Old 09-12-2011, 07:38 PM   #2752
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Originally Posted by mdhyams View Post
At 16% nitro you should not have to change the shim. Normally the shims are set for 20%. Basically here is the rule, .1 shim for every 10% nitro, So at 20% you need .2 shims, or 30% at .3 shims.

As far as the fuel nipple you canput a little thread locker on it and that will fix that problem.

Mike
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Hi

Thank you, i will check when i get home tonight, from memory it had three shims under the head.

I found this on the STS website:

- Under 20% Nitro 0.3 mm

So I will see what the go is...

Thanks
Andrew
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Old 09-12-2011, 07:51 PM   #2753
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Hi

Thank you, i will check when i get home tonight, from memory it had three shims under the head.
I found this on the STS website:

- Under 20% Nitro 0.3 mm

So I will see what the go is...

Thanks
Andrew

It depends on the thickness of the shims.

This was the standard for all engines.

Mike
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Old 09-13-2011, 06:49 AM   #2754
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Originally Posted by mdhyams View Post
It depends on the thickness of the shims.

This was the standard for all engines.

Mike
Hi Mike

Thanks for your assistance, I measured them tonight and it was over 0.30mm so I removed the copper shim and it is now right as per manual. I also have installed a new plug just to giver her a full service....

Have noticed HSN is tight to turn, my picco and SH engines are ot like this, might get another STS Carb just in case.

Thanks
Andrew
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Old 09-13-2011, 09:12 AM   #2755
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Originally Posted by Bundy_Bear View Post
Hi Mike

Thanks for your assistance, I measured them tonight and it was over 0.30mm so I removed the copper shim and it is now right as per manual. I also have installed a new plug just to giver her a full service....

Have noticed HSN is tight to turn, my picco and SH engines are ot like this, might get another STS Carb just in case.

Thanks
Andrew
The reason why the HSN is tight, could because of the o-ring.
That is normally a good thing.

Mike
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Old 09-13-2011, 06:31 PM   #2756
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Originally Posted by mdhyams View Post
The reason why the HSN is tight, could because of the o-ring.
That is normally a good thing.

Mike
Thank you for clarifying this for me, i hope to track test it again soon

Andrew
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Old 09-15-2011, 02:15 AM   #2757
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Hi

Just wanted to let everyone know my engine is now running alot better, thanks to everyone who assisted and thanks STS.

Andrew
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Old 09-15-2011, 07:34 AM   #2758
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Great glad I could help.
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Old 09-22-2011, 05:29 PM   #2759
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Thumbs up 833

i just got my sts 833 and opened it up WOOOOW man they did a great job on this one. looking to break it in this weekend has anyone tryed the 853 3port and is the 833 the short storke and the 853 the long storke
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Old 09-23-2011, 01:57 AM   #2760
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i just got my sts 833 and opened it up WOOOOW man they did a great job on this one. looking to break it in this weekend has anyone tryed the 853 3port and is the 833 the short storke and the 853 the long storke
There two engines are long stroke.
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