Quote:
Originally Posted by DIABLOsquid
2006 YerfDog Spiderbox 3206
Picked this up about two years ago for 800, was garage kept and had meticulous records and only two owners.
Got the front suspension fixed after I sent'er a little to hard on some washboards 😂, replaced original front end with a full BDX HD front end (bulkhead, A arms, knuckles and atv front hubs).
Now to the new issue..valves/top end power loss.
GY6 157qmj: Checked the valves which had almost no gap (way less than .002 on int & really tight .002 on exhaust. .002 is the smallest feeler I have so idk exactly where the int was). Set valve gap to int-.004 and ex-.005 but, I lost 2mph. So, then I set int-.003 and ex-.0045 but lost another 1mph. Before I adjusted the valves I was getting up to 29.5mph but, after first adjustment I dropped to 27mph... Then to 26mph after 3rd adjustment. Though I have a picked up low end torque a noticeable amount 🤷*♂️
I have a jet kit coming as it feels like she is struggling for fuel at the top end. I get up to about 8500rpm and it drives nice no struggle but push to 8600-8700rpms and it feels like she's gasping for "air" (or fuel) ie. Lunging/pulsing at wot.
🤷*♂️🤷*♂️🤷*♂️ Any ideas? Am I on the right track? Am I missing something? 🤷*♂️🤷*♂️🤷*♂️
Help- Please and Thank you
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Looks like I maybe on the right track- left the valves at .003-int and .0035/.004-ex & installed a 35pilot and 110main lastnight (up from 32p and 107m), took it out for a rip and I was back to hitting 28mph at about 9100-9200rpms (per inductive mini tach). Bumped it up to a 115main jet this a.m. and hit 29.5mph @ 9200-9300rpms.
Though, It still seems to be lightly gasping on top end near 9400+/-rpms BUT, it seems to be rich at ideal as it holds floats between 1580-1620rpms and about every 200-300rpms it spudders/"misses" one firing. Sounds like an extremely light backfire *pop/puff* 🤷*♂️ any ideas