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Old 09-02-2010, 12:00 AM   #1
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Default Did i buy a broken engine??

Hey guys i just built my first nitro buggy, the D8. as my first engine, i decided to buy a used engine on ebay so i did not need to go through the process of braking it in. my question and problem is, when the engine is not mounted, the buggy roles forward and backwards very smoothly. but when i mount the engine on, it wont role at all. it feels like the brakes are on. it's like something is jammed. by the way it's an ofna hyper .21 pullstart engine. i havnt tried firing up the buggy yet because i'm afraid either the engine or the gears on the buggy will get jammed and get damaged. when i have it sitting on the ground, i've noticed that when i pull on the pullstart, the buggy will jerk forward. is this normal? according to the seller he only used it to break in the engine but decided to sell it because he wanted to try an engine without a pullstart. i took the engine apart and it's pretty clean and in new condition. did i buy a dud?
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Old 09-02-2010, 12:26 AM   #2
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Quote:
Originally Posted by bomber9 View Post
Hey guys i just built my first nitro buggy, the D8. as my first engine, i decided to buy a used engine on ebay so i did not need to go through the process of braking it in. my question and problem is, when the engine is not mounted, the buggy roles forward and backwards very smoothly. but when i mount the engine on, it wont role at all. it feels like the brakes are on. it's like something is jammed. by the way it's an ofna hyper .21 pullstart engine. i havnt tried firing up the buggy yet because i'm afraid either the engine or the gears on the buggy will get jammed and get damaged. when i have it sitting on the ground, i've noticed that when i pull on the pullstart, the buggy will jerk forward. is this normal? according to the seller he only used it to break in the engine but decided to sell it because he wanted to try an engine without a pullstart. i took the engine apart and it's pretty clean and in new condition. did i buy a dud?
Hi bomber9, if ur buggy wont roll with mota attached, could be that
ur gear mesh(clutch bell/spur gear) is too tight, make sure you have a
bit of movement(.5-1mm)backlash, I usually do up two screws, say 1 near
front of mota(servo side), and other one near back of mota(opposite side)
near pipe manifold, do up firm, so you can still move mota to get the desired
movement, once ur happy, tighten all screws, and re-check..And regarding
ur car moving when you pull the pullstart, could be ur clutch shoes are engaged on clutch bell, take clutch bell off and check, or it may be related
to the gear mesh also, and my opinion, ditch the pullstart, and get a starterbox...good luck....
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Old 09-02-2010, 12:40 AM   #3
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granpa 67, thanks for the fast reply. as for the meshing of the spur gears, i dont think thats the problem but i think you might be right about the clutch bell situation. i'll try that and we'll see if thats the problem. thanks for the help. as for using the pullstart engine, i actually bought a new Werks B5 engine but i kinda got scared and nervous after reading the "Break in Bible". i just bought a used engine to mess around with until i feel more comfortable.
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Old 09-02-2010, 01:01 AM   #4
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Originally Posted by bomber9 View Post
granpa 67, thanks for the fast reply. as for the meshing of the spur gears, i dont think thats the problem but i think you might be right about the clutch bell situation. i'll try that and we'll see if thats the problem. thanks for the help. as for using the pullstart engine, i actually bought a new Werks B5 engine but i kinda got scared and nervous after reading the "Break in Bible". i just bought a used engine to mess around with until i feel more comfortable.
No worries bomber...As for breaking in ur new mota, just take ur time,when
ya decide to break it in, pre heat motor before trying to start it, and ya can
put a stubby holder or wrap head in foil to keep temps up, ya could talk to
guys in ur area to see how they break motas in, as evryone has their own
method(heat cycles etc)...good luck...
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Old 09-02-2010, 01:07 AM   #5
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I live in Hawaii, not too much people run nitro here. everyone including myself runs electric. just wanted to try nitro, seems a bit more fun than electric. kind of getting bored with electric.
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Old 09-02-2010, 01:20 AM   #6
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If I was you I would break in the b-6. You really have no idea what the used engine has gone through or what problems could possibly come with it.

With the b-6 you know its new and you learn the ins and outs as you go from breaking it in to tuning it. Sort of a connection thing.

I would also check to make sure your bearings and your clutch shoes are in working order. It could be that the shoes on the clutch have mushroomed so they are sticking to the bell.

If you take the b-6 break in slow you will have no problems. The piston is matched very well to the sleeve making the break in process very simple.
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Old 09-02-2010, 02:16 AM   #7
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definate CLUTCH bell problem... pull the bell off, throw the bearings,shoes and springs away, start fresh...

as for break in, heat cycle method works best... its pretty easy, its all stated in the "break-in bible".... read it a few times, PM me if you have questions...
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Old 09-02-2010, 02:26 AM   #8
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The Ofna Engine problem could also be a Clutch related problem.

I would take of the bell, and see whats going on in there.

This sounds especially a clutch problem as when you pull the pullstart it jumps forward. I had this problem in my old car and it was the springs.
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Old 09-02-2010, 05:39 AM   #9
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Quote:
Originally Posted by GRANPA 67 View Post
Hi bomber9, if ur buggy wont roll with mota attached, could be that
ur gear mesh(clutch bell/spur gear) is too tight, make sure you have a
bit of movement(.5-1mm)backlash, I usually do up two screws, say 1 near
front of mota(servo side), and other one near back of mota(opposite side)
near pipe manifold, do up firm, so you can still move mota to get the desired
movement, once ur happy, tighten all screws, and re-check..And regarding
ur car moving when you pull the pullstart, could be ur clutch shoes are engaged on clutch bell, take clutch bell off and check, or it may be related
to the gear mesh also, and my opinion, ditch the pullstart, and get a starterbox...good luck....
a MOTA??? where the crap u from? LOL
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Old 09-02-2010, 05:50 AM   #10
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a MOTA??? where the crap u from? LOL
lmao ! +1
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Old 09-02-2010, 05:57 AM   #11
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if your a newer guy to nitro the break in bible might seem a bit confusing,
its really not to bad once you study it, but another option to avoid from damaging the dialed Werks engine you have, is you could always send it to
The Speed Shop and he can break it in for you, I am sure if you sent him your clutch he could also install it for you as well, that way you just get it back head over to the Werks thread and get help tuning it in correctly for your area. plus the Speed Shop prices are very reasonable. He has a thread on here as well. just a thought. the pullstart engines are a bitch to tune I do know that, dont let it turn you off of nitro when you have the best engine made right there with you.
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Old 09-02-2010, 05:57 AM   #12
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Quote:
Originally Posted by Greenlee37 View Post
definate CLUTCH bell problem... pull the bell off, throw the bearings,shoes and springs away, start fresh...

as for break in, heat cycle method works best... its pretty easy, its all stated in the "break-in bible".... read it a few times, PM me if you have questions...
Don't know if he needs to throw it all away and start over. Could be as simple as he doesn't have it shimmed right and the bell is tight against the flywheel. Does the flywheel spin free when you have the motor off?
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Old 09-02-2010, 06:06 AM   #13
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I would say buying a used engine is a big no no unless its new which means never mounted or broke in. Never try to avoid break in because sooner or later you will need it, and as far as ur clutch bell etc if the stuff is used and worn just buy all new and start fresh unless the stuff is still in good shape but if the clutch bell is bad replace it and bearings or replace bearing, clutches, spings.
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Old 09-02-2010, 06:15 AM   #14
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I would say buying a used engine is a big no no unless its new which means never mounted or broke in. Never try to avoid break in because sooner or later you will need it, and as far as ur clutch bell etc if the stuff is used and worn just buy all new and start fresh unless the stuff is still in good shape but if the clutch bell is bad replace it and bearings or replace bearing, clutches, spings.


+1 i learned a big lesson with doing that.
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Old 09-02-2010, 10:31 AM   #15
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check ur bearings in the clutch bell does it spin free, when u put the motor in the car ,when motor in the car and u roll it does it act like its trying to start the motor
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