new bee ? about moto fino mf50-6 By farra23 (Read 1,705 times)

[farra23]

got this moto fino in shop and would not start to begin so put new carb on got plenty of fuel then no spark replaced with all brand new parts cdi box, coil, sylinode, plug, plug wire, stator, trigger switch dealy had spark then lost it idk what happen there....then would turn over really hard checked compression at 150 psi shoulda been plenty i think then talked with tech on phone from moto fino said to adjust valves did to as manual says intake at .004 and exaust at .005 now only 50 psi compression still turns over hard lost at what to do anymore just want to get running and get it out of my shop any help is appriated please thanks!

[sprocket]

Re-adjust the valves...and be certain to turn the engine forward ONLY...some scooters have a reverse starter preventer cam and you have that engaged...hence the lack of compression

On the fan side turn the engine clockwise and make certain you are exactly TDC on the cam sprocket. You can't use the flywheel marks...they are usually inaccurate

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[farra23]

ive done my best to set valves acording to cam gear same thing


what you mean by reverse starter preventer being ingaged how do u disengage that or is it auto release? still same deal pretty sure getting everything right but maybe missing somethin open to suggestens

[Alleyoop]

Just to clarify, Kill Switch is off, on Center stand etc..
Checking Spark grounding the plug to the motor ALSO try grounding to frame. The engine may not be grounded.
Last Resort pull the KILL SWITCH from the CDI.
Alleyoop

[farra23]

tried grounding to frame but engine does not turn over fast enough to produce spark i think gotta figure out the proble my it turns so slow i have a brand new starter and new batter with battery tender on it idk what is going on with this thing pulling my hair out trying to figure it out think ive read the manual like ten times now lol just like to get one problem at a time being why does it turn so slow unless plug is out?

[sprocket]

Just pop the plug and hand turn or kick start the engine a few times to disengage the reverse start preventer...it is a little metal tab thing on one side of the rocker arms...

Then set the cam sprocket exactly to the marks and adjust the valves...

If it is turning over slowly like you say you may have the valve gaps so wide you are on compression on every stroke.. the valves may not even be opening...

But you should be able to see this by looking at the valves as you turn over the engine...

If this is a 50 cc the gaps are set to .003 inches... both

[Alleyoop]

First do what SPROCKET said, SET YOUR VALVES correctly the Valves MAY NOT BE OPENING and that is why it is hard to turn over on every revolution of the Crank.
If set correctly you should be able to turn it over by hand one full turn then on the next turn the COMPRESSION STROKE it should be hard at one point of the turn(that would be the compression stroke).
Alleyoop

[farra23]

so i pulled plug kicked over moter about ten times then i reset cam gear to adjust valves set each to .003 and only getting 50 psi it better than was but at first before i ask moto fino tech i was getting 150 idk y im not getting that again i have compression stroke aroud when hole on cam gear is at top and i can look in the plug hole and see the valves are opening and closing it looks like it should be right but i must be missing somethin somewhere idk what tho really fusturating
thanks for help so far hopefully can figure it out today would be really nice

[sprocket]

Well if the valves are closing and you only get 50psi then there is something else wrong...likely a cracked piston, blown head gasket or really bad rings...the pressure has to be going somewhere...right

You will never get a GY6 150cc engine to run under about 90 psi compression...

[farra23]

so i decieded to set the rockers just like i would in a car with intake fully compressed then set exaust to .003 then same for otherside with exaust fully compressed set the intake now got 150 psi when kick starting it but starter wont budge it i threw brand new starter on it again this morning since other one had really hard yellow stuff coming out by shaft and pronge for wire but wont turn it over just clicks cylienoid i dont get it acts like it wants to start once when kick starting it then nothing and it is only a 50cc engine just so u know......thanks

[farra23]

so update it took off starter and held it to ground on frame and she took off really good and powerful so i ran a ground from starter bolt to ground on frame and turns over really good but not good spark only light orange spark not sure what else to check to give it good blue spark ive changed the stator trigger ignition coil sylinoid plug wire plug so idk what to do there glad making progess this form is really helpfull thanks just last little bit and this thing is solved thanks

[sprocket]

Check the ground wire from the engine to the frame.. or run a new one...see if you get a good spark...

Is it an AC or DC CDI?

If AC check the voltage on the power wire to the CDI that comes from the stator. If that voltage is above 50 volts AC or so...swap out the CDI

[farra23]

it is ac and i decided to do that and worked great nice blue spark so still wouldnt fire then deceided to cap the plug to get bigger spark and like that it fired up i just went for ride runs like a champ thanks for all the help was really a big help i knew i just needed that extra little bumb to get it going thanks sprocket and alleyoop PROBLEM SOLVED

[sprocket]

Good to hear!