Hitchen187 Posted January 6, 2014 Posted January 6, 2014 Is it possible to fit the reed valve block upside down or can they go in either way round took my dt125 1999 apart and forgot to mark it up school boy error
dt502001 Posted January 6, 2014 Posted January 6, 2014 Most reed blocks are marked "UP" but on yours I dont think it matters as they are even top and bottom and the reed stops are the same T& B right? if not then the smaller stop goes to the bottom
Hitchen187 Posted January 7, 2014 Author Posted January 7, 2014 Ok thanks ill check it out today will this mek the bike rev high on tick over and it only runs with the choke on
Moderator DirtyDT Posted January 7, 2014 Moderator Posted January 7, 2014 I think this was answered in a previous post of yours The most likely causes are; the carb is not assembled properly or you have an airleak. High revs with them slowly coming down and not idling properly are classics airleak symptoms. Try and keep the same issues in one thread as people can read the full history and see what has been suggested and what has been eliminated. Running a 2 stroke lean will hole the piston.
Hitchen187 Posted January 7, 2014 Author Posted January 7, 2014 Ok so heres were im at now iv followed the advice iv been given so far which has been a great help Iv rebuilt the carb and sealed up the inlet manifold and reed valves the manifold has no holes init and looks in good condition iv also checked the crankshaft seals they seem ok and now it seems to be idleing fine but when i try to rev the bike it bogs out like its being starved of fuel is there anything else i should look for
Hitchen187 Posted January 7, 2014 Author Posted January 7, 2014 Iv cleaned out all jets out aswell and made sure i can see light through all the holes in all the jets
Moderator Airhead Posted January 7, 2014 Moderator Posted January 7, 2014 ...........it seems to be idleing fine but when i try to rev the bike it bogs out like its being starved of fuel is there anything else i should look for is this with choke or without choke?
Moderator DirtyDT Posted January 7, 2014 Moderator Posted January 7, 2014 Assuming you have done all the jobs so far correctly. Does it bog at standstill or when trying to ride? At what part of the rev range does it bog and does it clear at any point?
Hitchen187 Posted January 7, 2014 Author Posted January 7, 2014 It does it with choke off and it happens if i open the throttle fast it bogs and tries to cut but if you twist throttle quickly on and off a couple times i can stop it from stalling if you get what i mean
Hitchen187 Posted January 7, 2014 Author Posted January 7, 2014 Also if choke is on it slowly starts to die if i leave it idleing
Hitchen187 Posted January 7, 2014 Author Posted January 7, 2014 It does clear if i let revs build slowly at a standstill just bogs if i put full revs on quickly and i havent tried to ride it yet since iv resealed all inlet manifold up tonight but it was cutting out though before i cleaned carb out after around 200 meters of riding like it ran out of petrol but kicked up again eventually also seems to run better if i have ppetrol tap on reserve
Moderator DirtyDT Posted January 7, 2014 Moderator Posted January 7, 2014 Have you tried it with the petrol cap off? Have you cleaned out the petcock (fuel tap)? Is it new fuel and have you cleaned out the fuel tank?
Hitchen187 Posted January 7, 2014 Author Posted January 7, 2014 No iv not tried these yet ill clean the tap and tank tomorrow can the fuel cap cause a problem if so what is it please
Moderator Airhead Posted January 7, 2014 Moderator Posted January 7, 2014 It does it with choke off and it happens if i open the throttle fast it bogs and tries to cut but if you twist throttle quickly on and off a couple times i can stop it from stalling if you get what i mean so with choke ON it's OK and choke OFF it dies with throttle...is that right? if so, this is quite normal with a cold engine, is your engine cold?
Hitchen187 Posted January 7, 2014 Author Posted January 7, 2014 I leave choke on 5 mins but bike eventually dies like runnin out of petrol but will start up after a few kicks with choke still on and idle the same and still bogs wen i take choke off also iv noticed oil or something going on the front pipe of the exhaust near the manifold is that a gasket problem and would this affect anything
blackhat250 Posted January 7, 2014 Posted January 7, 2014 Pilot jet," have you adjusted air screw atall,?
Hitchen187 Posted January 7, 2014 Author Posted January 7, 2014 Pilot jet is clean and the 2 adjustable screws on the carb are set to 1 and a 1/2 turns out iv been told this is yamaha factory setting but if there is a better 1 than that you no of ill happily give it a go
blackhat250 Posted January 7, 2014 Posted January 7, 2014 Did you take out the pilot jet " i would, thers more than 1 hole in it, your problem points to pilot jet blocked,
Hitchen187 Posted January 7, 2014 Author Posted January 7, 2014 Yeah took pilot jet out all holes were clear i could see daylight through them all before i put it back in
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