DT125R FORUM

YAMAHA DTR125 DT125R RE X 3BN CYLINDER HEAD MINT PERFECT CONDITION 1998 - 2006
if u look under the sparkplug hole u will see stamped y1 thats top compression head

ok seems dts use the same compression code as 2rh tzrs y1 is the best compression
y4 is the lowest check yours is y1 if its not then try to replace with a y1and only skim it if warped just to flatten not any further or your back to square 1 hope this info helps

i would advise throwing that head in the scrap and get a high compression replacement tzr 4dl use same heads as dts use a high compression off 1 of those standard if piston is hitting the head than its plian and simple useless will search the head reference up to post 2rh tzrs range y1 to y4 y1 best compression cant say on dts/4dls if u use thicker head gasket u r undoing the skimming any ways as u r spacing out the combustion chamber which the skimming is done to reduce thus upping compression

u want a sticky tyre pick a soft compound makes r all the same if u pick a reputable brand i.e bridgestone avon and the like be warns soft tires dont do many milage like harder so u will wan to balance both

Yamaha TZR125 DTR TDR 125 Wiseco Piston Stock 56mm Bore 679M05600
on ebay aint bad at all either they range .5mm and have 8 stages u have to have a rehone though to be sure u aint blowing your funds

athena r quality parts u wont go wrong with these

@Calum said in How quick should a dt be?:

@tdrgreg2 Super teen was a racing series for teenagers to enter. Due to their age and experience, the series was designed to race 125 two strokes.

Teens would predominately race Aprilia RS125's, Honda RS125's and the Occassional Yamaha TZR 125 RR

The engine in that bike is a direct fit into the Yamaha DT125R.

I fitted that into my DT.

may i ask what u did with the rest of this 4dl please im fond of these and would buy whats left if u have any tyvm

ok i also know and forgot to add some have a servo others r locked on the exhaust valve i.e yvps so if yours is of the locked ilk it will be a slower type but will have 1 powerband range

ok people let me help you with good info u cant compare a yzf to a dt and i will tell u y yzf has same size wheels and high gears for road speed dts have 21 inch front 17 back down gearing for excel and lower gearing on front to back sprockets soo the dt top end will be about 75 standard but will get there much quicker also the yzf is a 4 stroke which is no comparision at all u want more top end use bigger front sprocket u want more excel reduce front or up back sprockets simple and afforable