leesiel
Yardcart 196
It is nasty weather here so I haven't had time to check my valve lash .......
196 cc engine mods
- Thread starter leesiel
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leesiel
Yardcart 196
Reset valve lash to .003. Made no change to my starting problem.
Is it possible that it "jumped" timing or that I put it together 180° out? If so how ? Will it run temporarily out of timing?
I Am getting backfire from exhaust and the carburetor.
Is it possible that it "jumped" timing or that I put it together 180° out? If so how ? Will it run temporarily out of timing?
I Am getting backfire from exhaust and the carburetor.
Poboy kartman
Senior Moments Member
Anything is possible...but here's what the fact is. If you indeed lined up the cam and crank dot to dot exactly...it can't be off. There is no 180° out there.
As I mentioned though...setting valve lash 360° out is possible.
The only timing achieved after dot to dot is via flywheel timing..which basically takes the place of a car's distributor which is possible to stab or route wires 180° out.
On small engines..it's set with a key and keyway...so if they're intact..it can't be 180° off.
As I mentioned though...setting valve lash 360° out is possible.
The only timing achieved after dot to dot is via flywheel timing..which basically takes the place of a car's distributor which is possible to stab or route wires 180° out.
On small engines..it's set with a key and keyway...so if they're intact..it can't be 180° off.
leesiel
Yardcart 196
I'm positive I aligned the dots.
At a loss; she ran and slowly died . I WANNA RIDE ! Help
I followed every article and video to the T , could something have worked it's way loose .? Am I gonna need a complete teardown to figure it out ?
At a loss; she ran and slowly died . I WANNA RIDE ! Help
I followed every article and video to the T , could something have worked it's way loose .? Am I gonna need a complete teardown to figure it out ?
Poboy kartman
Senior Moments Member
Ran and slowly died?
That's the carburetor...start by opening the idle mixture screw. Then..with the kart jacked up. Give it throttle and play with the high speed mixture screw.
That's the carburetor...start by opening the idle mixture screw. Then..with the kart jacked up. Give it throttle and play with the high speed mixture screw.
Bbqjoe
Banned
Me? I'd probably tear it down to the bones, and start over, finding something stoopid I did in my excitement.
leesiel
Yardcart 196
Took the head off and the side cover , and based on appearance everything looked good ,my coil gap was right, valve lash was right , spark plug capped properly .
Fuel is Getting to the carb( a new carb ) and still not even trying to start with new plug ( I checked the voltage with multi-meter ) everything seems fine BUT.
I Will breakdown carb soon but not really thinking that this is the problem cause she won't start with starter fluid.
Have I overlooked something ?
Fuel is Getting to the carb( a new carb ) and still not even trying to start with new plug ( I checked the voltage with multi-meter ) everything seems fine BUT.
I Will breakdown carb soon but not really thinking that this is the problem cause she won't start with starter fluid.
Have I overlooked something ?
bob58o
SuckSqueezeBangBlow
Still After 4 months... This is crazy.
leesiel
Yardcart 196
Now bear in mind I have only laid hands on it 4 times total in that month hoping an answer would appear online in a video or forum but haven't located anything yet.
I also didn't GAB my research efforts sooooooo maybe something I left on the table in my efforts ( or lack of ).
leesiel
Yardcart 196
Tore it down again and double checked every thing that I could think of; carb is off and I will break it down tonight and hope I find something.
Before I pulled carb I tried to start it with a drill while my son moved the throttle mid-way through process she started backfiring while turning over ( she didn't do that the last 2 times I tried to start it ) am I getting closer ?
Before I pulled carb I tried to start it with a drill while my son moved the throttle mid-way through process she started backfiring while turning over ( she didn't do that the last 2 times I tried to start it ) am I getting closer ?
CoroTheCat
Builder
try checking the flywheel key if you haven't already, had mine break when i shut the engine off after the first run and it wouldn't start after that, it backfired through the carb.
leesiel
Yardcart 196
Never occurred to me to look at the key I'll check when I get home this evening.
Thnx
Thnx
OzFab
Well-known member
I was sure someone already mentioned that but...
leesiel
Yardcart 196
Poboy mentioned it in an offhand manner.
Took flywheel off and sure enough I had a sheared timing key. That I can fix; I'll be riding this weekend if not today .
Big thanks to Coro the cat for sharing his experience and to all that had others who were trying help me figure it out !!!!
Yardcart rides AGAIN!
leesiel
Yardcart 196
Was sheared flat with crank.
Do they make a better 8° key ? What causes this and how do you prevent this from happening ? Is my flywheel to heavy ?
Do they make a better 8° key ? What causes this and how do you prevent this from happening ? Is my flywheel to heavy ?
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bob58o
SuckSqueezeBangBlow
My guess is that is was improperly installed or the flywheel was improperly installed or not torqued down correctly. Some will suggest lapping the flywheel to the crankshaft.
Jody (this guy down here) is very helpful.
https://www.youtube.com/watch?v=7JbNzoUjpFw
---------- Post added at 09:51 AM ---------- Previous post was at 09:42 AM ----------
Two Claps and a Ric Flair for CoroTheCat!!!
Give em some help holdin' those alligators down.
https://www.youtube.com/watch?v=hwYmcd8gZQU
Jody (this guy down here) is very helpful.
https://www.youtube.com/watch?v=7JbNzoUjpFw
---------- Post added at 09:51 AM ---------- Previous post was at 09:42 AM ----------
Two Claps and a Ric Flair for CoroTheCat!!!
Give em some help holdin' those alligators down.
https://www.youtube.com/watch?v=hwYmcd8gZQU
CoroTheCat
Builder
Glad I could help 
, I was also really confused when my engine didn't run because it had fuel, spark and compression
I lapped the flywheel to the crank, (I have a couple flywheels laying around and wasn't sure the flywheel came from that engine, so I lapped it just to be sure) I then installed a new flywheel key and torqued the flywheel with a torque wrench and the engine has worked without a problem ever since.
, I was also really confused when my engine didn't run because it had fuel, spark and compression I lapped the flywheel to the crank, (I have a couple flywheels laying around and wasn't sure the flywheel came from that engine, so I lapped it just to be sure) I then installed a new flywheel key and torqued the flywheel with a torque wrench and the engine has worked without a problem ever since.
Poboy kartman
Senior Moments Member
Poboy mentioned it in an offhand manner.
Took flywheel off and sure enough I had a sheared timing key. That I can fix; I'll be riding this weekend if not today .
Big thanks to Coro the cat for sharing his experience and to all that had others who were trying help me figure it out !!!!
Yardcart rides AGAIN!
Oh...and Poboy gets no love??? Nevermind...I'm used to it...glad you got it sorted out!
Just kidding...I thought maybe you would check that key with my info...unfortunately, a sheared key can let the timing change indiscriminately...changing the symptoms.
Now...seriously look into lapping the flywheel...an 8° flywheel key is pretty weak. But people run crazy rpms with lapped flywheels with NO key. What does that tell you?
Good luck...and seriously...despite all the banter...we just really want to help.
leesiel
Yardcart 196
Lots of people have helped both directly and indirectly helping me to get here through past post , information that they've given others trying to help them , through links to other sites , or sharing their experiences ( mistakes and successes ).
Point being I wouldn't have gotten this far without my go kart brothers and sisters .
Cheers to you all
May be a little early to celebrate as I have not started her yet but I feel safe in saying that she will start fairly easy now that the last piece of the puzzle has come to light
P.s. Bob was very careful in the reassembly of the motor ; I'm positive the key was installed properly , because of my propensity to mess things up because I'm in a hurry .
lol
Point being I wouldn't have gotten this far without my go kart brothers and sisters .
Cheers to you all
May be a little early to celebrate as I have not started her yet but I feel safe in saying that she will start fairly easy now that the last piece of the puzzle has come to light
P.s. Bob was very careful in the reassembly of the motor ; I'm positive the key was installed properly , because of my propensity to mess things up because I'm in a hurry .
lol
Poboy kartman
Senior Moments Member
Again....let me reiterate.
It has NOTHING to do with properly or improperly installed. An offset key is by nature and physics inherently weaker than a straight one.
Grape Ape would tell you many racers run them and failure is a common problem with factory flywheels.
Yes...the factory flywheel is heavier and the billets have timing advance built in and lighter weight, too.
However, SERIOUSLY!!! Investigate flywheel lapping. It's cheap and easy....and could save you a lot of aggravation down the road.
It has NOTHING to do with properly or improperly installed. An offset key is by nature and physics inherently weaker than a straight one.
Grape Ape would tell you many racers run them and failure is a common problem with factory flywheels.
Yes...the factory flywheel is heavier and the billets have timing advance built in and lighter weight, too.
However, SERIOUSLY!!! Investigate flywheel lapping. It's cheap and easy....and could save you a lot of aggravation down the road.
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