Change the engine for a brand new one

Question edited for clarity.
Question moved to model category.

Torque Specifications - Honda CRF250X Owner's Manual ...

ManualsLib https://www.manualslib.com > manual > Honda-Crf250x

Honda CRF250X Manual Online: Torque Specifications. ENGINE Torque Item N•m kgf•m 1 Cylinder head cover bolts 10 1.0 2 Exhaust pipe joint nuts 21 2.1 3 10 ...

Crankcase Torque Spec.?? - CRF250R & RX

ThumperTalk https://www.thumpertalk.com > forums > topic > 8357...
Nov 5, 2010 - 12nm, 9ft lbs or 108"lbs. Don't use loctite on the case bolts. Use some blue loctite on the kick start bolt, that usually the one that comes ...

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Left side cover torque specs 2005 crf 250

CRF's Only https://crfsonly.com > forum > viewtopic
Feb 25, 2012 - Hey fellow red riders I'm having to change my left side cover and can't find the torque specs for the left side cover bolts and if the ...

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HONDA CRF250X

Honda http://owners.honda.com > 2005 > 2005_crf250x
side cover bolt (8). 6. Install the collar (7) and seat bolt (9) tighten the bolt to the specified torque: 20 lbf·ft (26 N·m, 2.7 kgf·m). Servicing Your Honda.
180 pages ..

I am assuming the carb is in good order. Be sure the battery has a good charge and that the spark plug is giving a strong spark. So you have good fuel delivery and good spark, and the air cleaner should be pretty clean. The problem is usually flooding of the engine by twisting the throttle too much, too often. Each twist sends a shot of gas into the chamber. It is pretty easy to flood the engine.

pull the carb, remove the main jet, take to a motorcycle shop and ask for the next size up and the one after that. Replace jet and ride, if it feels better try the next one up and so on until you no longer feel a better result, then go back one.

• the cables dont come undone from the carb i had an 07 08 honda 250 and i found it was easier to take the throtle apart and leave the cables attached

the two side....honda is the only compagny that used separate transmission and engine oil (crf 250 and crf 450). the left side is the engine oil and the right side is the transmission. i recommend 5100 motul on the engine and motul 3000 10w40 on the transmission side (motul 3000 is not a transmission oil but it works on fourstroke that normally mix it up to getter ) d,ont forget to replace filter ....hope this will help,if so ....leave me good feedback please.

Your best bet is to go up one or two teeth on the front sprocket. This will increase the top end speed. Swapping gears is not likely to help and would be problematic.

If you have the owners manual check that, otherwise ring a bike shop and ask them for advice.

The crankcase oil fill is the dipstick hole on the left side of the engine. It holds .73 quart. The right side fill plug is for the transmission oil. It holds .63 quart. You will need to drain the transmission oil and refill it with the correct amount of oil. The drain is located on the left lower crankcase. It is bolt/washer in the parts diagram of the link below. I recommend you purchase an owners manual or service manual for this bike as this is a high performance model that requires frequent maintenance.
http://216.37.204.206/wps/Honda_OEM/HondaDB.asp?Type=12&A=1

not positive what you are asking, but on this bike, the engine oil also lubricates the transmission gears. what is key is to use a motorcycle oil. automobile oils are too slick and will cause your bike's transmission to slip.