kthatch805

less than a gallon and it wont stay running.. on the table it runs but when i put it down it flames out..??? not running hot...did proper break in.. changed fuel line.....im running ofna allu clutch shoes with gold springs.. anyone have any ideas??

redfox03

might be your clutch shoes, check those. i've heard of this problem before but i can't quite remember what causes it. but do check the clutch. also do a search on here, i know you'll find some threads on this problem. hope this helps.

kthatch805

so i took it apart and put it back together.. went by my LHS and they could not tune it either.. i bought this POS from them 3 weeks ago their answer is that most likely its a lemon!!! wow 350 and you can still get a lemon.... do urself a favor and dont buy a ninja. i had a picco and got 6 gallons out of it...

JB COMP

contact mugen/ninja and see if they will replace it.

kthatch805

I wrote them an e-mail, i hope they get back to me.. No Reedy truck race for me...

coololdude

Don't give up on it yet....sounds like maybe in brake in the con rod stretched a little and pulled it out of tune......you could try a new con rod???

gil_millan1

ill buy it from you the way it is. how much?

kthatch805

well its still fairly new so i would want 300.00

kthatch805

well if its the con rod them im really done with this motor a 350 dollar motor should not have these problems....

coololdude

Ya I agree.....

Da Smak

Nobodies suggested the easiest thing yet, Try a new glow plug.

It's quite normal to replace the conrod after break in, if you think the during that period he rod is under the most stress it will ever see, a lot of mnufacturers recommend replacing it after the first gallon anyway to avoid this very problem.

Also, what fuel are you running it on and have you shimmed it to accept this?

kthatch805

A new glow plug??? cmon man that was the 1st thing i did... im not that sofa kingdom

Da Smak

Well you never said and it's often overlooked and I dont care if your a furniture shop. But if you are running gold springs with an alloy clutch the maybe you've got a duff spring and the shoe is dragging, so when you sit it on the groung this drag is enough to stall the engine.

kthatch805

hmmmm thanks i will switch them out....

redfox03

thats what i said earlier. well thats what i meant to say, Da Smak just worded it better.

Da Smak

Other options are if the engine is sat too close to the spur and the gear mesh is too tight, If the brakes are on when the throttle is neutral, too rich on the bottom and it's loading up before you get it on the floor (given away by cuting out when you remove the ignitor) or maybe the engine is so out of whack that it really does need a full on retune from scratch.

2DMaxLST!!

My money is on the clutch dragging. The new pinch on a Ninja is not that bad, it was very easy to break in.

kthatch805

so its not the clutch i checked.. its got a leak somewhere.. after tunning it it ruins good but wont settle down.. i richend it all the way out and worked my way down to a good tune..do even when its WAY rich after a pinned run it cmes back and sounds like its starving for fuel..then bogs out..

2DMaxLST!!

I would check the entire fuel system and both exhaust gaskets to make sure they are perfect.

supertib

what brand glow plug are you running ? some brands of glowplugs wont seal in the ninja head causing air leaks , the Ninja motors are pretty solid, you issue sounds very much like a tuning problem, air leak, etc.... I would be checking your fuel filters, fuel tank, fuel hose, carb cinch bolt.....

On rare occasion the Ninja's have had front bearing issue, which could result in a severe air leak....But if it isnt the front tbearing it has to be something very simple, these motors have only 4 moving parts, so there isnt much that can go wrong, there is no such thing as a lemon as the LHS is describing.... to me the LHS sounds imcompetant if they cant diagnose such a simple running problem....I would be pissed off if thats all they are willing to do for you.....

Also what head shims and nitro % are you running, as well what tuned pipe...???? what is this motor running in ?

kthatch805

so my LHS after further inspection think that its the front bearing that is leaking... they sent it to horrizon today to see what they can do..

j_blaze

i had the same thing happen a few weeks back, engine would quit after high speed passes. it was the fuell filter pulling air at high rpm's, took me an hour to see catch it, tiny bubbles after reving with lid off. it ran great on the box but as soon as i would drive it it would quit. i doubt its the clutch shoes unless the wheels are turning as you start it. clutch shoes kill the engine when you brake.

Vigilante212

If I ever took an engine to my LHS and they couldnt fix a simple front bearing leak without sending it out I would find a new LHS .

2DMaxLST!!

I would still like to hear the plug and fuel.

kthatch805

Only ran ninja plugs.. and 30 byrons.. no shim..