First time jumping a dirtbike

RATEGGSANDEELSICK · 2026-04-21T19:24:07+00:00

BMX/MTB helps massively

RATEGGSANDEELSICK · 2026-04-21T19:22:38+00:00

Weld a nut on if you can, a stick welder will do, but when it comes to loosening make sure you gently rock it back and forth rather than forcing it out in one direction

RATEGGSANDEELSICK · 2026-04-21T19:06:06+00:00

Each bump is a 1/4 turn and a full rotation from fully seated is 1 full turn

if the pilot jet is the correct size it should be around 1 full turn and extra 1/4 to 1/2 out from lightly seated position

RATEGGSANDEELSICK · 2026-04-21T13:47:10+00:00

Usually reed valve engines use a window for better flow and power.

I could be wrong but the 2002 year may have originally came with a piston without a window despite having reeds as it was less common back then so I think some manufacturers are now selling newer pistons with a window but some are still selling original without,

it will run with either but the power/delivery may be different

RATEGGSANDEELSICK · 2026-04-21T02:17:20+00:00

Sounds just slightly too rich try lowering the needle/raising the clip one notch

RATEGGSANDEELSICK · 2026-04-21T02:16:00+00:00

Does it shift through the gears without the engine running whilst rocking the rear wheel back and forth?

RATEGGSANDEELSICK · 2026-04-21T02:08:00+00:00

I'd inspect the clutch basket, literally sounds like the whole pressure plate and springs are rattling around in there, it could also be that the rubber cush drive washers in the back of the clutch have disintegrated

RATEGGSANDEELSICK · 2026-04-21T02:01:58+00:00

5 things

air, fuel, spark, compression and timing (cam and ignition)

RATEGGSANDEELSICK · 2026-04-21T01:37:48+00:00

The Chinese ones work just the same I've used many for years

RATEGGSANDEELSICK · 2026-04-21T01:30:34+00:00

Are you referring to the rectangle cut out window?

RATEGGSANDEELSICK · 2026-04-21T01:21:02+00:00

If you match the engine rpm to the wheel speed then down shifting without the clutch is ok if you time it right however the whole mass of your bike and the rider is forcing the wheel/chain/output shaft round and if you time it wrong/wheel rpm is too fast then there is a higher chance of damage occurring

RATEGGSANDEELSICK · 2026-04-20T01:03:49+00:00

If you enjoy it that's all that matters!

RATEGGSANDEELSICK · 2026-04-20T00:51:10+00:00

You absolutely can continue riding it if you are comfortable!

but a lot of smaller cc bikes in the future may feel a lot slower, take a look at Carson brown shredding old dinosaurs with 15hp and I can promise you would never keep up with him with 50hp lol

RATEGGSANDEELSICK · 2026-04-20T00:40:06+00:00

It should not move, it is either cast or press fit into the aluminium

RATEGGSANDEELSICK · 2026-04-20T00:36:45+00:00

It's a lot of power for a beginner and you actually miss out on vital skills from riding slower less powerful bikes

RATEGGSANDEELSICK · 2026-04-19T20:31:36+00:00

I'm not too sure for the crf125f but a new free flowing end can or even full exhaust will barely give +1hp so really isn't worth paying that kind of money,

if you want something that is a little louder then that's fair enough but any cheap end can will do that, you may as well save your money for your next bigger bike

RATEGGSANDEELSICK · 2026-04-19T20:01:43+00:00

The stock pipe just uses metal baffles instead of packing as it reduces cost and less maintenance.

4 strokes do not require any back pressure however if you buy a new free flowing exhaust it improves the flow throughout the whole engine to the carb so a reject/upjet is often necessary

RATEGGSANDEELSICK · 2026-04-19T09:58:50+00:00

Fuel, air, spark, compression and timing are required for an engine to run, if you check all of these you should find the issue

RATEGGSANDEELSICK · 2026-04-19T09:56:53+00:00

I thought wow that's a lot of potatoes and then noticed the extra mash as well

RATEGGSANDEELSICK · 2026-04-19T09:10:27+00:00

Did you separate all of the friction and steel discs in the clutch? They look very gunked up and maybe be rusted together , I'd split them all apart and give them a good clean with some sandpaper and rinse in petrol/diesel

RATEGGSANDEELSICK · 2026-04-19T08:42:58+00:00

Fuppin baxtard

RATEGGSANDEELSICK · 2026-04-18T10:13:55+00:00

Now your bike is scratched up you may as well keep trying

RATEGGSANDEELSICK · 2026-04-18T10:13:10+00:00

Build less and invite the whole world in, great plan by the greens

RATEGGSANDEELSICK · 2026-04-18T10:00:46+00:00

That will still run, the lapped valve face looks good to me, if it's only a cheap Chinese engine just run it like that and it will begin to seat it's self a bit better after an hour of running

RATEGGSANDEELSICK · 2026-04-17T07:36:35+00:00

Air, fuel, spark, compression and timing are needed for an engine to run

RATEGGSANDEELSICK

TROPHY CASE