2020 Beta 300RR wont start

[RR 300]

Looking for ideas of why it wont start
I have spark and fuel
Drained fuel and replaced and also removed jets to check if blocked
Swapped of spark plug with a spare

Bike was started 2 weeks ago with no issues

Any help would be appreciated

[F5 Dave]

Roll it down a hill.

Pwk carbs some people lay the bike over to flood the carb a bit more. But 2 weeks should be nothing.

I'd try a 3rd plug.

Check choke is holding up OK.

Float level should not leak on sidestand, but start to if tipped a bit further.

[RR 300]

Roll it down a hill.

Pwk carbs some people lay the bike over to flood the carb a bit more. But 2 weeks should be nothing.

I'd try a 3rd plug.

Check choke is holding up OK.

Float level should not leak on sidestand, but start to if tipped a bit further.

Thanks Dave,

New spark plug fitted and still not going

Chock is clicking up so I say its working correctly

I have tried to bump start in driveway but it didn't work... not a hill but differently fast enough to get it started

Some things i have noticed is when I give it a bit more fuel it sounds like it want to go but to much throttle and it backfires. When i drain the bowl more fuel runs out of the overflow... is that normal?

[F5 Dave]

Hmm. OK going out on a limb.
Is the throttle closing properly? Like if you snagged the cable loading it up on the trailer, pulling it out so it hangs up on the adjuster?

Either end.

Closing it should bonk on the carb body.
Reason I ask is that it can feel ok at the throttle, but if the slide is hung up 5mm, you won't start it until you get it spinning fast enough for long enough. Unlikely off the start button. Dangerous if it does. Should have mentioned that before I said crash start it.

[RR 300]

Hmm. OK going out on a limb.
Is the throttle closing properly? Like if you snagged the cable loading it up on the trailer, pulling it out so it hangs up on the adjuster?

Either end.

Closing it should bonk on the carb body.
Reason I ask is that it can feel ok at the throttle, but if the slide is hung up 5mm, you won't start it until you get it spinning fast enough for long enough. Unlikely off the start button. Dangerous if it does. Should have mentioned that before I said crash start it.

I think it is, when I had the carb off the other day i did check the throttle was was moving but didn't pay to much attention to the gap. I'm thinking of check the reed valves too.

[F5 Dave]

You'd be seriously unlucky for the reeds to break. Betas are usually pretty reliable.

[pete376403]

When you tried bump starting, what gear did you have it in? First or second is too low and will probably just lock the wheel. Try third or fourth. push the bike up to speed, dump the clutch. Might help, couldn't hurt

[Kickaha]

I have seen reports of wires chafing though on the headstock, although I think that was the model before, I'd also check the flywheel hasn't come loose

[RR 300]

You'd be seriously unlucky for the reeds to break. Betas are usually pretty reliable.

You'll right, the reeds are fine.

The carb is making that donking noise when I close it but it looks like there is a small gap at the bottom.

Spoke to bike shop and suggested to take spark plug and tip the bike over and see if fuel comes out, he is thinking fuel may have got into the bottom end.

[RR 300]

I have seen reports of wires chafing though on the headstock, although I think that was the model before, I'd also check the flywheel hasn't come loose

Thanks Kickaha, wires are ok and it has had the loom changed because of that happening.

If the flywheel was loose wouldn't I hear it when I try to start it?

[F5 Dave]

OK that's OK for carb position.

GG have a removable bung bolt so you can drain cases if drowned. Or gas flooded. A lot of Euro bikes did. Was a bit surprised my Beta doesn't.

[Kickaha]

If the flywheel was loose wouldn't I hear it when I try to start it?

Nope, we were on a ride when that happened to a guy on a Sherco, it wasn't obvious until the cover was removed, we had stopped and we went to move on his bike would not start

[RR 300]

Nope, we were on a ride when that happened to a guy on a Sherco, it wasn't obvious until the cover was removed, we had stopped and we went to move on his bike would not start

Had a look today and flywheel in tight and has all teeth.

thanks for the suggestion

[RR 300]

Update:

Still not luck but do have 1 question.

Does fuel spray in to the carb when it is removed from its boots. The bowl is full but when I open the throttle no fuel is enter the carb. I have cleaned the pilot jet but am thinking it maybe blocked some where else.

[F5 Dave]

Does the what, when it what? Boots?

So, no it doesn't have an accelerator pump like some foulstroke carbs used to.
Engine has to spin to suck gas up into the airstream.

Wow this really is getting perplexing. I'd be driving to a long downhill at this point.

Ps helmet always, pull clutch anytime it gets away and let it Rev if for some reason the throttle is stuck, even though you pretty much discounted that.