i replaced head gasket on my 98 750 and the bike ran before i opened her up. now i have her all together and it wont fire . sounds like timing but i did everything according to manual. can any give me somre suggestions as to what i might have done wrong. i ve pulled apart five time already to redo timming chain so i am stumped. heres a copy of the instructions on how to. am i missing somthing
its prob the timing marks . make sure they are dead on. make sure any grounds are on. also make sure u got the ignition coils it the right spots. they can be mixed up and not fire in right order
ok the timing marks coinside w position of chain in picture of manual,what grounds specifically could i have missed? and with ignition coils how do i know witch one goes to what cylinder, is that what u mean?
all great suggestions. thanx . i'm pretty sure i've got marks dead on . i've tired aligning marks then fully rotating crankshft and aligning marks still no. i've got spark. and fuel pump kicks on. so if i installed coils outa order what do i reference to find the position where each coil plug needs to b. and just to make sure i have the timing marks aligned on the right turn off the crankshaft, what do i do to make sure that the position of the crnkshft is correct. pictures would b helpful but i can get thru it weith a good description
We have already been down this road with a carbed instrument cluster on a FI bike........ Recently, didn't work then either, bike fired up when right instrument cluster installed.
ignition coils should have small numbers on the harness where they plug in. also should be 15 pins from mark to mark on cam gears for chain. some books say 14 which isnt right. if the coils are in wrong order also the harness wont fit as it should it will be long in some spots where it should be short
Ok, update on what i know so far. i've been busy with school so just got a lil time b4 my finals to troubleshoot this issue. after checking cams, crankshaft. coils n wiring order, timing chain all that is good i found out my num 1 cylynder has no compression, any ideas where to go next?
Check valve lash, make sure you don't have a valve that isn't closing. Then do leak down, see if you are losing compression past a bent valve or bad seat interface, past rings, etc. Don't tear down aimlessly without reference.
leak down, does that mean put a lil oil in cylinder and read compression and if i get movement that tells me the rings need some attention because the oil sealed enough to hold compression
i m not sure how to check valve lash.
Again, buy or borrow a leak down test device. It allows you to set a constant air pressure to your cylinder. Connect to air source and to spark plug hole. Set that cylinder to TDC, and lock crank from turning. Take off carbs and pipe. Put in 100 psi, Listen for signs of air escaping in intake or exhaust.