emrickb Posted September 5, 2021 Report Posted September 5, 2021 Bought a 7mil cub 443cc from West Coast Atv, installed the motor in my frame and started it. Was running good, but at first rev a oring rubber parts got out of the exhaust. So took of the coolhead, changed the domes for 21cc 9 degree big bore domes and putted back the coolhead. Started it, noticed that this sound appear at the first start but realized that the flywheel came loose. Lapped it, torqued to spec and blue loctied it. Still the same sound but way less louder. Tried to change the kicker assembly, brand new kicker gear, tried another clutch basket, another waterpump and still does it. Squish is at 0.0045 each side. What could it be? Quote
375hp banshees Posted September 5, 2021 Report Posted September 5, 2021 Complete motor? What'd Brian say?Sent from my SM-A505U using Tapatalk Quote
emrickb Posted September 5, 2021 Author Report Posted September 5, 2021 18 minutes ago, 375hp banshees said: Complete motor? What'd Brian say? Sent from my SM-A505U using Tapatalk Yeah complete motor. Thought at first it was the idler gear but he sent me a brand new one and still does it. Quote
375hp banshees Posted September 5, 2021 Report Posted September 5, 2021 Grab your pipe springs & see it it's them, does it only do it as your letting off? Not at a constant rpm or on the way up?Sent from my SM-A505U using Tapatalk Quote
emrickb Posted September 5, 2021 Author Report Posted September 5, 2021 What’s weird is that it didn’t do this sound before that i changed the domes. The first start after the dome change, did this sound but the flywheel was loose. Not only when i let off, past a certain rpm i don’t hear it i think. All gear work. More noticeable on neutral and 1-2 gear. Quote
375hp banshees Posted September 5, 2021 Report Posted September 5, 2021 Why did you change the domes, you get them from brian also? Quote
375hp banshees Posted September 5, 2021 Report Posted September 5, 2021 Cranks will make a similar noise. i assume since fly wheel came loose & had a bad o-ring, brian didn't test run& check it before selling it or it came with out flywheel? Quote
emrickb Posted September 5, 2021 Author Report Posted September 5, 2021 He said he had personally run it and tested it. But when i received it, idler gear bushing was bad and the spacer washer and retaining ring was not on the shaft but loose in the clutch cover. But before i opened the coolhead to change the oring, this sound was not there and motor was running great. Quote
emrickb Posted September 5, 2021 Author Report Posted September 5, 2021 15 minutes ago, 375hp banshees said: Why did you change the domes, you get them from brian also? Yeah brian sent me a set of 21cc with the 19cc in the motor. Quote
375hp banshees Posted September 5, 2021 Report Posted September 5, 2021 I'm sure he'll make it right, just gonna be some removing & shipping involved. maybe the 2 other members will give some input?Sent from my SM-A505U using Tapatalk Quote
caleb90 Posted September 5, 2021 Report Posted September 5, 2021 So you changed the domes and started it to find this noise before you took the clutch cover off??? Possibly the fly wheel went bad from being loose? Quote
emrickb Posted September 5, 2021 Author Report Posted September 5, 2021 Yeah brian is very fair and service is there. I'm just trying my max before taking it appart or shipping it back since i'm not very friendly with shipping a complete engine. Just weird that before it didnt have this sound.. Quote
caleb90 Posted September 5, 2021 Report Posted September 5, 2021 "Was running good, but at first rev a oring rubber parts got out of the exhaust. So took of the coolhead, changed the domes for 21cc 9 degree big bore domes and putted back the coolhead." trying to understand this part of your message better Quote
emrickb Posted September 5, 2021 Author Report Posted September 5, 2021 Just now, caleb90 said: So you changed the domes and started it to find this noise before you took the clutch cover off??? Possibly the fly wheel went bad from being loose? So, got the engine. opened the clutch cover before starting it, changed the idler gear and installed it in the frame. did 2-3 start for about 10-15 sec running max. last start, revved it and saw a oring part fly off the pipe so ordered a new oring kit for the domes. At the same time, changed the old 19cc for a brand new set of 21cc that brian sent for free. Started it again and heard this noise but 2x more louder. Checked everything and saw that flywheel was loose. Torqued it back, started and now i have this little sound. All gear work, no metal shaving in oil. Quote
caleb90 Posted September 5, 2021 Report Posted September 5, 2021 1 minute ago, emrickb said: So, got the engine. opened the clutch cover before starting it, changed the idler gear and installed it in the frame. did 2-3 start for about 10-15 sec running max. last start, revved it and saw a oring part fly off the pipe so ordered a new oring kit for the domes. At the same time, changed the old 19cc for a brand new set of 21cc that brian sent for free. Started it again and heard this noise but 2x more louder. Checked everything and saw that flywheel was loose. Torqued it back, started and now i have this little sound. All gear work, no metal shaving in oil. If you saw a oring fly off the pipe, did you pull the pipe to see if the o ring was still on the flange. If not the pipe will be rattleing around on the cylinder. Im not sure how you went from oring coming off the pipe to thinking it was the coolhead o rings Quote
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