79 yamaha srx 440 timimg

[vern]

looking for some info or help with my srx. When pulling over to start sometimes the recoil rope wants to rip out of your hands like timing is off. I checked timing put in dial indicator in plug hole,turned over until i found tdc and set indicator to 0. Turned counter clockwise acouple of turns and then back and stopped at .052-.055 BTDC and flywheel and stator are lined up. cdi box? Strange thing i did have it running after freshing up motor. Any info or help would be great. Thanks in advance.       

[Vintagesleds.com]

[jschaffer]

Did you put a new key on the crankshaft for the flywheel?  That can do it.  They are still available from Yamaha.  An old key can have a slight groove in it, throwing off your timing.

[vern]

Idid not use a new key. Going to pull flywheel off this morning and check. The only other thought i had was the crankcase filling up with gas after it sat awhile. But turns over fine was the key off.

[srxpc]

Double check your connections from stator to cdi. I changed the stator on my 79 and it would rip the recoil out of my hand also. Check my connection again and found I had two wires reversed.

[vern]

Ok i'll double check wires and connections. Did start it this morning and i found pulls over fine at full throttle. I'm thinking now maybe crankcase was loaded with gas?? Runs strong mid-range and up top but seems to be really rich still. going to look at fuel pumps and carbs again. took plugs were black.     

[SRXS]

Yes it will do that if the crankcase is full.  You should be fine now except for maybe low speed adjustment.

[vern]

Update. I changed cdi and starts alot easier. Of course we lost all our snow so cant take it for a ride. I'm thinking of leaving air box off and getting uni-filters. I'm running the PJ carbs with 35 pilot 310main and 80. Have 2.0 slide. I 'm thinking that would be a close start? Any suggestions?? Thanks     

[y2grey]

Removing the air box with PJ carbs = seizure

[jschaffer]

x2 on the airbox.  They run better and make more power with the airbox.  Those PJ carbs were made to run with the airbox.

[vern]

Ok Air box going back then. Thanks for the advice. Another question i had was the adjustment screw on the bowls,does that adjust  full thottle only? Never had these pj carbs. Thanks again   

[SRXS]

Mid range and top end.  It controls the main jet.

[back in the day racing]

On my 79 I run stock jetting with air box. Main adjuster screw closed. I am at about 950 ft. Above sea level.

[back in the day racing]

Trying to up load another chart from service manual but can't.will try later.

[back in the day racing]

About 1/8 of a turn is equal to one jet size.

[vern]

Ok thanks for the chart. There is 310 mains in there now. I'll put the 340's back in.  My slides cut out are 2.0  i may change them also. I got 1.0  and 1.5.