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Need help starting nitrostar .12 - 3/12/2012 11:52 PM   
dark321devil


 

Posts: 179
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From: Staten Island, NY, USA
Status: offline 		i recently decided to get back into the hobby after a 2 year break. I got all my cars back running except my hpi nitrostar .12.

Symptoms:
- starts and runs only at half-full throttle. as soon as i let off, it dies. tried manufacturer settings and everything in between setting wise.
- fuel is good as it runs in all my other nitros with no problem.
- tried new plug
- made sure to rule out possible air leaks.

What am i missing?

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RE: Need help starting nitrostar .12 - 3/13/2012 12:54 PM   
controlliner



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Status: offline 		Check your low speed needle. If it only has a HSN, check you idle stop screw and readjust the throttle opening to 1/16 in. You may be able to go to 1/32nd but throttle response may be a bit dodgy.

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RE: Need help starting nitrostar .12 - 3/13/2012 2:19 PM   
Argess



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Status: online 		Maybe try cleaning the carb. It could be gummed up after this time.

Sometimes when mine sit for a while, they run like that, but sort of clean themselves as fuel runs through the carb and after about 1/2 tank of running they're fine.

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RE: Need help starting nitrostar .12 - 3/14/2012 3:48 AM   
JohnP2



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Status: offline 		Have you tried increasing the idle some? Does it idle and run fine, but once you go OVER 1/2 throttle and release it dies? Perhaps your HSN might be a litle rich?

I had a similar problem once, and leaned the HSN a bit and it took care of it. Just a thought.

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RE: Need help starting nitrostar .12 - 3/15/2012 12:56 AM   
dark321devil


 

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Status: offline 		its the other way around. It only stays alive at half throttle or more. dies even at 1/4 throttle.

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RE: Need help starting nitrostar .12 - 3/15/2012 2:51 PM   
controlliner



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Status: offline 		Check Idle Stop setting. These engines were made by Toki in Japan and they have simple carbs. If it runs at full throttle, then it's the idle stop screw. I have the .15 version and it has the same carb.


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RE: Need help starting nitrostar .12 - 3/16/2012 4:08 AM   
dark321devil


 

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Status: offline 		ok i will try all of these this weekend. but correct me if im wrong. i havent played with idle screw becuase i am under the impression that if it was idle screw issue, the engine would have been running at minimal throttle? i know it wouldnt run at no throttle but if it was idle screw wouldnt it at least run at minimal throttle?

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RE: Need help starting nitrostar .12 - 3/16/2012 12:47 PM   
controlliner



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Status: offline 		The thing is, if the idle stop screw moves from a good setting due to vibration you will have problems with a dependable idle. As smooth as these engines seem to run, they vibrate at super high frequency and it is this frequency that loosens adjustment screws only secured by a spring.

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RE: Need help starting nitrostar .12 - 3/16/2012 2:45 PM   
proanti1



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quote:

ORIGINAL: controlliner

Check Idle Stop setting. These engines were made by Toki in Japan and they have simple carbs. If it runs at full throttle, then it's the idle stop screw. I have the .15 version and it has the same carb.


They were actually made by Shuwa (Mecoa), who manufactures engines for Toki, HPI, Tamiya, and several other companies.



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RE: Need help starting nitrostar .12 - 3/17/2012 3:44 AM   
JohnP2



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Did you get this fixed? If so, what was it?

Thanks



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RE: Need help starting nitrostar .12 - 3/17/2012 3:52 AM   
dark321devil


 

Posts: 179
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Status: offline 		unfortunatly no. i planned on taking the engine off and and attaching it to a piece of wood to rule out almost everything.

I got the engine off the car and realized the flywheel was spinning free of the shaft. After a painstaking amount of labor i finaly got the clutch bell off. It was a pain to get off as the flywheel was loose from the shaft.

both spring on the clutch were cracked and broken. Now i cannot get the flywheel off the shaft. the nut holding the flywheel on is impossible to turn as when i turn it, it turns with the shaft. i have tried using a fan for heat with no luck. im at my wits end with this engine.

this engine has less then a gallon of gas through it so i dont want to junk it until its the ONLY option.

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RE: Need help starting nitrostar .12 - 3/17/2012 1:33 PM   
controlliner



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Status: offline 		The broken clutch springs would contribute to an unreliable idle. There might be thread locker on the flywheel nut. Heat the nut with a heat gun.


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RE: Need help starting nitrostar .12 - 3/22/2012 3:42 AM   
dark321devil


 

Posts: 179
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From: Staten Island, NY, USA
Status: offline 		i finally got it off. some of you may not agree with how i got it off but i believe it was the only way. i took the head off the motor to where i can see the piston moving up and down. i used a piece of rubber (the rubber cap off glow ignitor) and 2 pencils inside the rubber cap to hold the piston from moving while i unscrewed the flywheel. i just ordered a new flywheel, collet, and clutch. once it comes in i will test it out and let you guys know

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RE: Need help starting nitrostar .12 - 3/28/2012 11:42 PM   
dark321devil


 

Posts: 179
Score: 105
Joined: 12/31/2005
Last Login: 4/6/2013
From: Staten Island, NY, USA
Status: offline 		So I received the parts and replaced them.put the engine back to factory settings. Started right up. Purred like a kitten

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All Forums >> RC Cars, Buggies, Trucks, Tanks and more >> RC Car Engines >> Car Nitro & Gas Engines >> Need help starting nitrostar .12
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