1992 RM250 idle *REBUILD*

[yamahor]

Ok so I have rebuilt the engine top to bottom..

also a new valve guide on the left side has been replaced..

when i first started it after everything beeing rebuilt..

it idles high. and idles up n down up n down.
and it sounds like a sled engine doesnt have that beautiful ting of a 2stroke engine.

is my valve not working properly or is my expansion chamber not creating the back pressure, or do i just need to work in the brand new valves an rings.


much help would be awsome before somthing does break.

[yamahor]

ok.. Ive cleaned the piss out of the carb, she now will idle steady.

but still wants to rev high, and sound like a sled engine.

im going to start it tomorrow and tape it an youtube the vid.

so anyone who has any ideas. come back on tomorrow and check this please..

thankss..

[yamahor]

ok..the high idle seems to be gradually going away. the power valves were tight an werent opening.

but now thats kinda going away.

but now it seems to kinda have a winding or grinding noise.. im going to post the video soon.. with a link

[yamahor]

ok... video should be up soon... its loading lol

my youtube account is swiftay18
ppl please check it see what you think..

i rebuilt my yz125, from the first bolt to the last, so its not my doing lol theres somthing fishy goin on

---------- Post added at 02:44 PM ---------- Previous post was at 02:41 PM ----------

heres the link to the video, it might not be processed right yet but soon..

[Only registered and activated users can see links. ]

---------- Post added at 02:46 PM ---------- Previous post was at 02:44 PM ----------

heres the link to the video, it might not be processed right yet but soon..

[Only registered and activated users can see links. ]

[fordmugg]

sounds too smooth ....have you tried riding it

[yamahor]

nope, and i havnt event done a run and flush of oil.

shoould i go through all the gears.?

[fordmugg]

i would run it around through the gears ...make sure everything is working and fluid levels are good ...see if the power is there, listen for any wierd noises and if somthing is still not right then you'll have to pick it apart

[yamahor]

ok.. found out the vibration, my drive clutch basket.

warped, and its not the right one for the engine..

my engine is a 250N model# 28C, and this basket was a 28E lol

i just bought a new water pump case and its grinding on the inside metal to metal.

So when i get that new basket next week sometime i'll post up an update.

[yamahor]

it still sounds like a damn snowmobile?

ratio is 20:1 maybe 25:1 for the breakin.

there is one thing not right. The pipe that came with the bike im sure wasnt the right pipe its not seating in the hole properly and it spits a bit.

now when i rode it, it seemd as powerband was instantly. I have a yz that runs just fine soo i know about the no bottom end power, this 2stroke has instant power everysingle gear i can be doing 5-10khms an put it in 5th an 1/2 throttle an pull the front wheel up sitting on theee tank INSTANTLY. sooo either this is one CRAZY engine or my vaalves are stuck open an im stuk on powerband.

IVE loosend tightend taken my cover off watcccheddd the arm see what itdoes when revvd, all seems fine..

if i cant find the shizznazzin problem soon ill just strip it for winter an put the engine in the shop and have it reaaaaseembled by them loollll