hi

2big4this said:

tested quad this morning it has carbon reed fitted.it started on the third pull,low-mid revs seem fine pulling away nicely but at max throttle it lost power & cut out do ineed to lean/rich position on c-clip?i'm on position 2 lean setting

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Pull the sparkplug out to read the insulator color/burn>>this will indicate which way youll need to adjust the engine tune......

Tin reeds restrict the air/fuel mix a tad in stock engines...When you add lighter more flexible reeds you increase the engines revs,,,The increased revs will need more fuel to get the engine to run like it should at WOT...

Try the c-clip on the 4th notch...........If the symptoms improve you may need a tad bit more jetting by upping the mainjet 1 size......

Id start by doing the petcock mod and upgrading the fuellines/fuelfilter to 1/4" and drilling the fueltank output larger aswell to increase fuel delivery flow........

Then Id regap the pickup coil to flywheel magnets to .020"

After that Id change the cheesy torch plug for a NGK BM6A gapped to .030"

Mod the stock airbox for more airflow...

Do the hp plugwire upgrade with an automotive type high voltage suppression wire

Start it up and give it a shakedown ride after all the changes to see how it performs and see what it takes to conform and perform....Just dont expect too much from the stock carb as far as making the engine run cherry day to day....Youll find that if its running killer now it may not 4 hours from now if the temps or barometric pressure changes
significantly.............Thats why I like pumper carbs.......Its less likely to burn up an engine and it tunes in minutes with no jetting changes or bowl removals,,,,Good Luck

had another run on quad today took it my friends house today,& run it up & down his rear garden, grass and decking with ramp.tried to start it,and it didn't want to have any of it. left it for 5 minutes,started first time(never starts on cue)but persistence pays off.got it warmed up, still problems with cut-out at higher throttle,on advise from buddy put more full in tank & it made difference but still had probs at high revs . clutch needs adjustment as it stuggled to pull away,or maybe could be gearing 6/54 maybe bigger pinion & larger sprocket would help.so going to do pet **** mod with fuel line &inline shut off.ordered all parts including a new float for carb as perished.1 question my c-clip setting is position 2 which is 4 notches away from needle end.and have max jet fitted to carbi will try end notch furthest from needle end later to see if that makes a difference, the other settings while i'm waiting for parts to be delivered.i'll also do porting on carb to improve flow.thanks again for advice from you all