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Post by scooterted on Nov 26, 2019 11:44:30 GMT -5
I've been running a stock head on a BBK for about 3 years. I did have to replace the crank after about 10k miles, but I don't know that it was a result of serious wear related to the head. Maybe a little shortened life by heavier piston weight. It was an very abusive 10k miles with me learning how to take care of the little scoot, not to mention the first ten years of it's life spent sitting in an old frat house basement.
After I replaced the crank I checked the compression, and it was over 150, but I'm pretty sure it was under 170. Carb installed, wide open with good battery, plugged into trickle charger.
I ended up upgrading from stock head to a 47mm valve head do to a small mishap with a spark plug and the stock head 🤣 I'm sure it's healthier to run the matching head for the 47mm BBK, but Does the higher compression lead to more performance? Higher compression does lead to more performance, Probably not earthshattering peformance though. Higher compression also leads to more heat, more wear, and a higher octane requirement.
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Post by scooterted on Nov 22, 2019 17:09:34 GMT -5
Sounds like ignition. I would pull it and inspect.
Wow your mechanic sucks.
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Post by scooterted on Nov 22, 2019 15:08:20 GMT -5
I doubt the slider would survive a core removal. If you go lighter i would get a 4.5 set. Mixing with 5.5 will net you 5. And then you would still have 4.5 to play with. It might even be worth a 4g set. You can add weight to them.
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Post by scooterted on Nov 19, 2019 13:23:24 GMT -5
I used an 88 mj. With that setup. Since we share the same setup and if you sea level like me that might be what to doctor ordered. Thanks Ted. That adjustable cdi sounds super interesting. It's not very expensive, of course we have all heard about the cdi limitations on some stock cdi's. My bike is a 2019 Boom "gator", quite possible I'm hitting a rev limiter but i was able to get up to 35-39 stock and i never had that weird bogging/jumling before, and the throttle roll back bogging makes me think I'm over jetted. Thanks. I'll rejet on Wednesday, I'm stuck riding it as is until then, bit of it just overjetted i should be fine, just annoyed. I am around 300-400 ft above sea level.
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Post by scooterted on Nov 18, 2019 18:26:45 GMT -5
I used an 88 mj. With that setup.
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Post by scooterted on Nov 15, 2019 22:20:15 GMT -5
I really dont know what the buzzing is. Maybe take the cvt apart and inspect?
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Post by scooterted on Nov 14, 2019 11:40:40 GMT -5
Honestly with that small of a variance i wouldnt worry about it, unless lives are on the line.
I stick with cheap meters, ive mistakenly burned out so many of them that im scared to invest in an expensive one.
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Post by scooterted on Nov 14, 2019 9:42:23 GMT -5
More specifically, what do you do with the throttle after killing spark?
What i mean is, you do your pull, kill spark, stop quickly (because a scoots clutch stays engaged until you slow down), do you allow the throttle to close? Or keep it open until the engine stops turning?
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Post by scooterted on Nov 14, 2019 9:26:08 GMT -5
Might be your meter. Is it a cheap meter?
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Post by scooterted on Nov 13, 2019 20:20:27 GMT -5
Aside from mixture, im out of ideas except for checking your compression, everthing is new though, so that shouldt be a problem. Maybe spark plug gap. Idk.
With all this work under the valve cover. Are you remembering to reinstall the ground?
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Post by scooterted on Nov 13, 2019 20:13:58 GMT -5
I see. Setting the lash can be a pain. I bought the tool pfs sells and it makes it a little bit easier.
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Post by scooterted on Nov 13, 2019 19:40:44 GMT -5
Why do you keep swapping intake setups? You just have to keep starting over.
Is your valve lash changing? Or are you just rechecking?
Air fuel ratio being off can make a change in engine sound.
Try moving the needle and swapping jets.
Edit: "Bogging" is usually how rich is described. I would go up a jet size and see if it gets worse.
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Post by scooterted on Nov 11, 2019 17:11:01 GMT -5
I WAS tuning wot. But i had taken to pulling the whole carb/intake assy off (by removing the two nuts on the intake manifold, rather than loosen the clamp to pull the carb) to swap jets. Well, i pinched the manifold oring. Part of it is missing, probably ingested, hopfully it made it out alright.
I knew it would happen, i just kept doing it. Oh well, pfs has them for 99 cents each. So i bought 5, and some more jets as i keep going richer and find im not still rich enough. I also bought some spark plugs for chopping, my really cheap ones wont be here til dec.
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Post by scooterted on Nov 11, 2019 11:20:09 GMT -5
Oh geeze. You cant catch a break. At least youve found the problem, and extracting that stud didnt sound like it was a problem. Dont worry about the cam being in backwards, not possible. Cam position determines what stroke the crank is on. Just make sure the crank is at top dead center and the two small holes on the cam gear are level with the top of the head and youll be fine.
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Post by scooterted on Nov 10, 2019 19:26:29 GMT -5
I wouldnt take all that apart right away. I would start with removing the fan shroud that covers the flywheel (4 or 5 bolts) and the valve cover (4 bolts).
If you need to adjust i would just remove what you need, that will probably be the top piece of the fan shroud (i would say just the cover with two screws but youll have to scrape the rtv that you used for the tensioner.
Check your spark plug gap while youve got it out also.
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