Baja don't run

[Roni92]

Now that zenoah on my rovan 5ive clone started (https://www.largescaleforums.com/threads/zenoah-32cc-stopped-working.29649/), but still needs to wait for pullstart and other parts from Netherlands for week or so i want to now play with baja in the meantime, problem is, that POS also is giving me headaches.
Funny enough that rovans 29cc was easiest starting engine i had, it always started with one or two pulls, actually easier than zenoah to start. Ran also always well, despite feeling like have no compression(compared to zenoah lol).
And just like with my zenoah, first start this winter it started and ran fine, then few days later this madness started. Im no expert but sounds like it carb can't feed enough fuel, despite engine being wet inside, because it nevers getting over idle/high idle and dies everytine after few seconds. Tank ventilation is fine, tried with open tank, doesn't matter. Fuel lines look ok.
Ok so in order, i can make her start, shell run for 10seconds~ then die. Won't respond to throttle or die if added throttle. AFter it dies, it wont start in the same position of choke as before. That is: if it started with choke, it will start again only without choke and vice versa. Is it possessed? lol.
Anyway basics are covered: pretty sure no leaks on insulator, basic stock carb settings, bulb is full with petrol, with no air bubbles. Took bottom part of carb, all looked good, no dirt inside or anything suspicious. Will take a look also at top part of carb, but what that will help me? Im sure it will look ok, i cant do anything with that, other than maybe try to clean it, but how without special tools?
Im out of ideas. Maybe take carb to mechanic?

 

[spents]

it sounds like you're flooding the engine fella,
how are you trying to start the engine?
are you trying to run the engine with the choke on?
the only time you need the choke is for an initial pop from the engine,
start procedure is choke on and prime the carb,
pull till you hear a pop, usually 1 or two pulls,
choke off and pull and it should start within say 4 or 5 pulls,
dry the engine out and try the above, plug out and pull engine over a few times to get rid of any excess fuel, put a fresh cmr7h plug in and try and start it to see what happens,
you say its the original 668 carb, the zenoah g320 uses an 1107 carb so i assume you're using the old carb from your rovan engine,
that carb may be worn out or have damaged diaphram etc,
get a new 1107 carb and try again if it wont run after doing the above,
getting a mechanic to look at the carb will probably cost you more than just buying a new carb anyways,
don't try and launch the car to the moon when pulling the starter, a good firm pull is all you should need,
if the engine locks up then its probably flooded, clear the engine and start over,
check that the coil gap hasn't closed up as and is catching on the flywheel as well, reset the air gap between the coil and flywheel ( if needed ) using a business card between the two,

 

[Roni92]

Ok maybe I wasn't clear enoug and looks like you replied to linked thread which is solved.
This thread is about my rovan Baja with ori 29cc rovan engine and ori 668 carb that she came with.
Linked thread is about rovan Lt with zenoah 32cc, that was probably flooded and changing plug helped.
This rovan Baja engine gives completely different problem as described in first post here

 

[spents]

Ok maybe I wasn't clear enoug and looks like you replied to linked thread which is solved.
This thread is about my rovan Baja with ori 29cc rovan engine and ori 668 carb that she came with.
Linked thread is about rovan Lt with zenoah 32cc, that was probably flooded and changing plug helped.
This rovan Baja engine gives completely different problem as described in first post here

no worries fella, i misread the top post and thought you were on about your 32,
same rules apply to the 29 as well though,
if the engines wet inside and has a wet plug then could be the carbs over fueling the engine as well, it will still bog n die with too much fuel,
when you stripped the carb was the diaphram distorted in any way, may need a rebuild kit,
weak diaphram, torn diaphram etc,
how old is the fuel, bad fuel makes these engines do silly things as well,
you said the bulbs full so the fuels getting to the carb,
all you can do is work through everything carb related to start with, check the pulse hole in the insulator/carb isnt blocked or partially blocked by a piece of dirt or a bit of gasket,
then either try a rebuild kit for the carb which is the cheaper option, or try a new 668 and see where that leads you ,

 

[Roni92]

Ok so I just got her to run, even did some donuts in snow
Increased gap in spark plug a lil and now she starts, though still not that easy. I guess these lil engines just don't like to start in cold.
Anyway, now she got symptoms of too lean high, idle/low seems good, it's smoking, but in transition from ide to throttle it chokes for a second and then RPMS raises, I remember I had this issue in summer all it was was not enough fuel. After than moment of bog RPMS climbs normally and looks like power and rpm are there. bUT no matter how much H needle I unscrew it have same symptoms, like H needle doesn't matter. Have tried to make it leaner than 1.5 out yet. So that would indicate clogged H circuit on carb right?
Other than that short bog fromidle to throttle all seemed fine. Cheers

Plug after like 5 minutes of driving
Ok, next update, she doesn't react to h AND l carb screws.... Until I close them completely it runs the same poopy way. Literally I could unscrew them completely, no difference at all

 

[Roni92]

Next update I finally pulled carb and took it apart.
As suspected nothing majorly bad for my amateur eye and even if something wrong I don't have tools to test it and fix.
Will clean it as much as I can

 

[Rep732]

From an experienced eye those diaphragms are toast. To be more clear you need to buy a rebuild kit.

 

[Roni92]

From an experienced eye those diaphragms are toast. To be more clear you need to buy a rebuild kit.

Nice, that's why I love internet. Few minutes and I have pro expertise thanks for that.
Considering at the bottom of carb there's "rofun" text doesn't surprise me it got smoked.
But does it tell you why that might happened and I could prevented it somehow?
It was storaged and not used for over year with empty carb, should be leaving carb full?
Before putting it away it worked like swiss clock so I guess time done it.
Anyway I'll put my carb from zenoah on it and report back effects. I deserve some braps after all that crap
just look at that glorious original 1107, I reckon she LL gain some power too

 

[Roni92]

changed carb to 1107 from zenoah that i know works well. Guess what. Same fookin story. No reaction on H L screws, bog on throttle.... hows that even possible....
Last thing ii can think of is fuel filter, cuz lines are fine.
Dying coil? I replaced one in the past. Not enough compression? Broken piston ring?
I don't have any more energy for this crap
Also, L needle unscrewing didn't lower rpms

 

[Rep732]

Sounds like an air leak at this point. You going to have to pull it apart. Do you see any spots around the case gasket or cylinder base gasket that looks to have oil and dirt collecting?

 

[Roni92]

You mean engine block leaking? No i don't see anything unusual, lot of oil collects under exhaust gasket, but other than that I can't see any leak from engine block. But I also can't see all angles in car so who knows.
Ima buy WD 40 and spray some on insulator block maybe it got deformed, had horror stories like that
btw I still have to test without fuel filter
Good thing also I found those carb repair kits in Poland to my surprise and they cheap ;

 

[Roni92]

She working now again.
Changed too many variables to know what was main issue. But engine doesn't leak.
New plug, back to ori carb but with new gaskets, fresh fuel. Starts and works perfectly fine.
I mean throttle reaction isn't the best but I didn't run her long so I might forgot and being used to zenoah this might feel lil slower reacting, but still plenty powerful for baja chassis.
She smokes quite a big though even after warming up, zenoah only when it's cold, so not sure if all is good, but feels fine, no bogs or other fueling issues for 1tank