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Re: Top end seize
Posted: 07:21 am Nov 04 2016
by Julien D
Friedom wrote:Not enough. Your assessment is valid, although I never had a hanging idle to indicate lean conditions (which may or may not matter).
SS109 pointed out that another likely cause was that I was running 87 octane. I didn't know better.
I talked to Millenium Tech today, and they said it would be around $1500 for them to fully rebuild the motor. After a good laugh about that, we whittled it down to replating the cylinder so I could at least sell it off, ported and polished with the piston kit all ready to bolt on.
There's a crank on Ebay finally though, and I'm seriously considering getting that and a fresh head and reassembling it all myself.
"Good job, guys. "
You should, it's really not a bad job. Pretty fun, all in all.
Re: Top end seize
Posted: 08:14 am Nov 04 2016
by david
Friedom wrote: we whittled it down to replating the cylinder so I could at least sell it off, ported and polished with the piston kit all ready to bolt on.
If you are going to sell it, don't waste the money on 'ported and polished'. This is a performance modification designed to wring the last ounce of power and/or move the power band. Just get it repaired and re-plated.
Re: Top end seize
Posted: 09:09 am Nov 04 2016
by Friedom
Julien D wrote:
You should, it's really not a bad job. Pretty fun, all in all.
No doubt about that. It's the ongoing expense that's getting me. The pay/play ratio on this one is a little rough.
david wrote:
If you are going to sell it, don't waste the money on 'ported and polished'. This is a performance modification designed to wring the last ounce of power and/or move the power band. Just get it repaired and re-plated.
I agree. The port and polish was already done before though, thus my interest in saving the cylinder. Has BDK valves in it too.
"Good job, guys. "
Re: Top end seize
Posted: 05:31 pm Dec 01 2016
by Friedom
Well the engine is back, millenium got some money. I bought an 89 crank and had it shipped directly to RB. Should have it back next week (optimistic). New crank bearings and seals waiting for it here. Then reassembly and hope for the best! I should replace the reeds and reed block, but there's light at the end of the tunnel at least.
"Fun Wheel Drive"
Re: Top end seize
Posted: 12:14 pm Feb 02 2017
by Friedom
New rad valve in. Check.
Rebuilt crank with new crank bearings. Check
Cases assembled 3x. Extra o ring on output shaft removed. Check.
"Fun Wheel Drive"
Re: Top end seize
Posted: 02:15 pm Feb 02 2017
by KDXGarage
Third time is the charm
Re: Top end seize
Posted: 02:47 pm Feb 02 2017
by Friedom
Jason wrote:Third time is the charm
Thankfully I had read enough stories about verifying things go together right that I left the left side main bearings out until I was certain that it was ready for assembly. Then I tried dropping it in with freezing bearings/heating the case like I did on the right side, and the bearing went in a whopping 5mm, expanded and got stuck. Nothing some threaded rod and sockets could fix.
"Fun Wheel Drive"
Re: Top end seize
Posted: 10:34 pm Feb 08 2017
by Friedom
She's all together, assembled, torqued, oiled, mounted, broken in and awesome!
Definitely runs better now than last time. Got some rad valves in there, plus I was missing the crush gasket in the exhaust before (didn't know it).
She's pulling 3rd gear wheelies. I didn't expect that!
Now I'm actually interested in getting some good plastics to make it a looker. Any good sources of blue plastic around, by chance?
"Fun Wheel Drive"
Re: Top end seize
Posted: 11:56 pm Feb 08 2017
by KDXGarage
Congratulations on getting it going!
You may want to try FRP Offroad for blue plastic. I got my blue (aqua) shrouds from him... 14 years ago.
Also, keep a constant eye on eBay. Off color plastic commands a premium, though!
Re: Top end seize
Posted: 01:01 am Feb 09 2017
by Friedom
Message sent off to frp. 68$. Is that each or for a set? I love my bike, but that's a but much for cosmetics on a dirtbike.
"Fun Wheel Drive"
Re: Top end seize
Posted: 02:00 am Feb 09 2017
by KDXGarage
Aftermarket shrouds are almost always sold in pairs, except for the bikes that only came with one radiator.
Re: Top end seize
Posted: 06:59 pm Feb 11 2017
by Friedom
Found some blue ones on ebay for a decent price. Hope they look good.
As luck would have it, when I went to run the bike for a short ride yesterday, I started with a warm up and then wanted to dial in the carb. What the? Where'd my air jet go? D'oh! New one will be here next week some time.
"Fun Wheel Drive"
Re: Top end seize
Posted: 10:23 pm Feb 11 2017
by KDXGarage
Cool that you found some blue plastic. Which parts did you find?
Re: Top end seize
Posted: 10:32 pm Feb 11 2017
by Friedom
Just the side panels. The green shrouds on my white tank are going to stand out even more now.
"Fun Wheel Drive"
Re: Top end seize
Posted: 10:33 pm Feb 11 2017
by Friedom
Anyone know if the wiseco piston bumps the compression ratio? I'm wondering if that's part of the issue that I had with this engine last time.
"Fun Wheel Drive"
Re: Top end seize
Posted: 12:32 pm Feb 12 2017
by KDXGarage
I think the piston is standard compression. That may have been more than an old piston.
Re: Top end seize
Posted: 12:48 pm Feb 12 2017
by Friedom
It was actually a wiseco piston with about 20 hrs on it since a full rebuild.
"Fun Wheel Drive"
Re: Top end seize
Posted: 10:43 pm Feb 12 2017
by KDXGarage
Oh. Nevermind.
Re: Top end seize
Posted: 11:13 pm Feb 12 2017
by Friedom
Hey have you rebuilt your top end? Anyone notice that the head nut closest to the spark plug tightens way further down the stud than any of the others?
"Fun Wheel Drive"
Re: Top end seize
Posted: 12:18 pm Feb 16 2017
by Tyl3r
I'm pretty sure they should all be even. Maybe your stud isnt threaded into the cylinder as much as the other studs?