R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Nitro On-Road > Onroad Nitro Engine Zone

Reply
 
Thread Tools Search this Thread
Old 09-02-2012, 04:57 AM   #1
Tech Adept
 
Join Date: Dec 2009
Posts: 232
Default OS Speed 12 XZ SpecII tuning issues.

Hi I recently ran my OS Speed 12XZ SpecII which I kept for months after I broke it in and tuned it.so when the first time I ran it again,the engine seems to have high idling and when I lower the idle,it dies.changed plug,checked engine(no damages internally),retune it but still same problem.only different this time is I'm using O'Donnell now instead of Byrons.guys please help.
tq23 is offline   Reply With Quote
Old 09-03-2012, 07:13 AM   #2
Tech Addict
 
Join Date: Sep 2010
Location: Del-A-Where?
Posts: 559
Trader Rating: 3 (100%+)
Default

i recently had the same issue with my speed xz that i didnt use for a while. i found the front bearing is leaking not allowing it to idle after warm up.
automagic302 is offline   Reply With Quote
Old 09-05-2012, 01:51 AM   #3
Tech Addict
 
JamesHealey's Avatar
 
Join Date: Jul 2011
Location: United Kingdom
Posts: 556
Trader Rating: 1 (100%+)
Default

You could have the bottom end tune too rich and your idle is open too far which gives it an idle that won't allow you to shut the carb more as it just becomes way too rich and stalls.

Also could be the other way too! make sure you're tuning your bottom needle to your idle gap, not the other way around!

Taking out the venturi (if it has one) visually set the idle gap to about 0.5mm, prime the engine and start it.

Tune the HSN, then set the LSN so it idles high for 20 secs after a fast run, then lower the idle gap if required, then richen the HSN 1hr.

This is your basic tune, tune on the track for performance now.

If you already knew all this then sorry
__________________
Serpent 977 Evo | Novarossi Engines | Racing Experience Fuel | Xpert-RC Servos | Xtreme Tyres | Bitty Design Body Shells |
http://answer-rc.com/en/ - Answer RC supported driver.
JamesHealey is offline   Reply With Quote
Reply



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 07:59 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net