Maintenance & Technical > Kx Frankensteins

YZX500 Project

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umberto:
It sounds good, but I would still do some plug chops just to make sure.  Better safe than sorry for sure, especially with the less common 1988 motors we have. 

scottysg:

--- Quote from: umberto on March 01, 2016, 10:11:47 AM ---It sounds good, but I would still do some plug chops just to make sure.  Better safe than sorry for sure, especially with the less common 1988 motors we have. 

--- End quote ---

Good call, I want to keep as many of these alive so our species does go extinct :)

Check out this shot of my plug chop: 69 degrees, sea level, 40:1 maxima 927, 168 main, 58 pilot, air screw 1.5 turns out, fresh filter, slightly overcast\foggy.

Got the bike warmed up for about 20 minutes, shut it down, pulled the plug, put a brand new one gapped to 22 thou (manual says 24 but Ive had better results with 22, does anyone possibly know why). Started it up, rode to the end of the block not at full throttle but pretty quick, turned around, wound it out to the top of 4th, pulled the clutch\hit the kill, coasted back to the toolbox, and this is the result. Not seeing a perfect 'ring' like I've seen on the internet. Also, since I'm doing this on roads (ahem in mexico) I didn't want to have it wound to the top of 5th for 1 mile at wot like I've read I need to. with my gearing thats like 120 lol. I don't know if this would lead to my test giving inaccurate results.

Let me make a guess before the experts tell me what the plug actually says: The motor is running slightly rich at wot based on the carbon deposits that have lightly covered the whole tip of the ceramic. I could go down 1 size on the main, but for safety, its probably best I stay with this size.

Alright guys, let me have it-what is going on in my engine! Thanks for the tips :)

scottysg:
The bike is running great! My computer got stolen which is why its been challenging to get pics up. In any case, I rebuilt the motor, got the crank balanced and bearing seat repaired at crankworks, the bike is very smooth. after lots of experimenting with heat wrap im pretty settled. the bike is now just a rider, not a project anymore which feels great. though its almost red sticker season so knowing me ill have this apart again soon riding other bikes. it pulls very well. if i could get it to hook up... my friends dont ride behind me anymore and tires dont last very long out here in californias rocky terrain. the frame seems to be holding up well to the extra weight. i have a big desert tank too so this was never planned to be a light bike. im a tall but very light guy so i just point it and hang on! its been a fun journey to get this done.

If anyone has questions about the work or problems please let me know, im very happy to share what ive done :)


The problems with this build seemed never ending


this is why you shouldnt hit doubles on a street bike...


killed my old dc welder, got this fancy new one and i recommend it to others


proud over my creation! (heat wrap not finalized in this photo, im using much less now)

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