So Close!...
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wrote on 17 Dec 2022, 17:43 last edited byHead is still leaking but very slowly/slightly, it doesn’t overflow the expansion tank unless I ride middle-hard (not flat out) I’ve ordered a 27mm hex drive (1/2 drive) for the forks. I have another new head gasket but I’m going to try and limp through the salt season, until spring before fitting any new parts. I’ll do the head if it gets worse but I really want to get my old barrel rebored by PJME (best finish I’ve seen on a bore!) Also I’ve a crank I want to get rebuilt and balanced. My bike doesn’t want to rev above 7-8k in gear, which doesn’t seem right?…
Need to get new bottom end bearings and seals all through, clutch buffer rubbers and a new rear shock, as well as dreaded swingarm & linkage bearings, bushes and seals
I wish that Satan Claus didn’t see me as naughty, it’s all so expensive a labour of love!
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Head is still leaking but very slowly/slightly, it doesn’t overflow the expansion tank unless I ride middle-hard (not flat out) I’ve ordered a 27mm hex drive (1/2 drive) for the forks. I have another new head gasket but I’m going to try and limp through the salt season, until spring before fitting any new parts. I’ll do the head if it gets worse but I really want to get my old barrel rebored by PJME (best finish I’ve seen on a bore!) Also I’ve a crank I want to get rebuilt and balanced. My bike doesn’t want to rev above 7-8k in gear, which doesn’t seem right?…
Need to get new bottom end bearings and seals all through, clutch buffer rubbers and a new rear shock, as well as dreaded swingarm & linkage bearings, bushes and seals
I wish that Satan Claus didn’t see me as naughty, it’s all so expensive a labour of love!
wrote on 18 Dec 2022, 01:40 last edited byWhoa! Just went for a 35~40mile jaunt, I don’t like flashing blue lights road blocking in front of me in the pitch black! It is well disorienting! It is nice to not be pulled over just because you’re out and about at 1 in the morning though. 20 years ago I would of been tugged on principal!…
Times are so different…
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Whoa! Just went for a 35~40mile jaunt, I don’t like flashing blue lights road blocking in front of me in the pitch black! It is well disorienting! It is nice to not be pulled over just because you’re out and about at 1 in the morning though. 20 years ago I would of been tugged on principal!…
Times are so different…
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@SpookDog you are mental
you do serious mileage on your bike. I haven't ridden any of my motorbikes since July. Fired up the DT yesterday, took a few kicks but akk seemed well.wrote on 18 Dec 2022, 19:51 last edited byI know, if the weather is adverse I feel obliged to test myself against it
️I cleaned out the bowl of my carb last night before I went out, specifically the pilot jet because it’s not been starting or running great at low revs. It’s like a different animal again! Great starting, smooth revs all through the bottom to ‘top’ mid range. I’m surprised how much of the rev range is actually affected by the pilot jetting!
When I removed the pilot and blew it through you still couldn’t see a definitively clear hole (it was opaque) I had to use a thin, kinda serated wire to clear it till it showed properly to the eye. I don’t know if it’s a hard deposit build up or a ‘gluoopy’ oil residue? But something seems to be regularily obscuring the jets bore. Maybe cause I’m running pre~mix? (Castro Racing) The filter on the fuel tap looks great, also I’ve got a good new filter in-line between the tank & carb. I don’t really understand its cause
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wrote on 19 Dec 2022, 15:05 last edited byThis post is deleted!
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I know, if the weather is adverse I feel obliged to test myself against it
️I cleaned out the bowl of my carb last night before I went out, specifically the pilot jet because it’s not been starting or running great at low revs. It’s like a different animal again! Great starting, smooth revs all through the bottom to ‘top’ mid range. I’m surprised how much of the rev range is actually affected by the pilot jetting!
When I removed the pilot and blew it through you still couldn’t see a definitively clear hole (it was opaque) I had to use a thin, kinda serated wire to clear it till it showed properly to the eye. I don’t know if it’s a hard deposit build up or a ‘gluoopy’ oil residue? But something seems to be regularily obscuring the jets bore. Maybe cause I’m running pre~mix? (Castro Racing) The filter on the fuel tap looks great, also I’ve got a good new filter in-line between the tank & carb. I don’t really understand its cause …wrote on 22 Dec 2022, 22:00 last edited byHoop! Talking to myself!
Bike chewed up a piston ring last night. Just lost power and started clattering, killed it like a heat seize with the clutch. Took the exhaust off tonight and peeked into the exhaust port. One ring down and a lot of shiny new scratches on my (previously pristine) 3MB cylinder head
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I had to nurse it 30 miles to get home to safety. So I’m guessing if any of it dropped down a transfer port I’ve lost the crank and cases as well. Oh well, shit happens…Can’t help thinking that there are loads more worthy candidates out there than me tho’
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Hoop! Talking to myself!
Bike chewed up a piston ring last night. Just lost power and started clattering, killed it like a heat seize with the clutch. Took the exhaust off tonight and peeked into the exhaust port. One ring down and a lot of shiny new scratches on my (previously pristine) 3MB cylinder head
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I had to nurse it 30 miles to get home to safety. So I’m guessing if any of it dropped down a transfer port I’ve lost the crank and cases as well. Oh well, shit happens…Can’t help thinking that there are loads more worthy candidates out there than me tho’
wrote on 23 Dec 2022, 09:58 last edited by@SpookDog wtf! I have never seen someone have as much bad luck with these engines as you.
All I can think is that you are caining it everywhere and you do lots of mileage. But in the 12 years of ownership of my bike I have only blown the head gasket after I used a cheap one after my bike got stolen...
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@SpookDog wtf! I have never seen someone have as much bad luck with these engines as you.
All I can think is that you are caining it everywhere and you do lots of mileage. But in the 12 years of ownership of my bike I have only blown the head gasket after I used a cheap one after my bike got stolen...
wrote on 23 Dec 2022, 16:26 last edited byIt feels like bad luck for sure, but the head gasket problems were just my ignorance and previous boners putting wrong jets in the wrong carb. My head problems are totally solved now…
I’ve never had a two stroke or any other engine have a ring let go though. I’m guessing it happens at the exhaust port where the rings have to bridge the biggest ‘void’. My barrel/piston was a bit worn and egg shaped judging by the ‘slap’ movement in the piston. So it’s my own fault. I was really hoping it would see me through till the spring tho! Oh well
happens!… -
It feels like bad luck for sure, but the head gasket problems were just my ignorance and previous boners putting wrong jets in the wrong carb. My head problems are totally solved now…
I’ve never had a two stroke or any other engine have a ring let go though. I’m guessing it happens at the exhaust port where the rings have to bridge the biggest ‘void’. My barrel/piston was a bit worn and egg shaped judging by the ‘slap’ movement in the piston. So it’s my own fault. I was really hoping it would see me through till the spring tho! Oh well happens!… -
@SpookDog Did you make sure the Piston Ring End Gap was in tolerance upon assembly?
In most piston kits I've had, one is within spec and the other is almost always out.
wrote on 23 Dec 2022, 18:05 last edited byNo, I didn’t. They were new rings from pjme and they slipped in ok. I just did a quick visual with them in the barrel to make sure they weren’t doing anything extreme
I was just hoping it’d be ok cause I rarely go above 6k and never above 7k (I still don’t know what a late 88-90 engine shoul rev to!!) Just killing time & cruising up them miles till spring
There’s no mystery, I’m just feeling sorry for me~elf
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No, I didn’t. They were new rings from pjme and they slipped in ok. I just did a quick visual with them in the barrel to make sure they weren’t doing anything extreme
I was just hoping it’d be ok cause I rarely go above 6k and never above 7k (I still don’t know what a late 88-90 engine shoul rev to!!) Just killing time & cruising up them miles till springThere’s no mystery, I’m just feeling sorry for me~elf
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@SpookDog Hhmm
I wonder whether the rings were out of spec then?The problem is, if they're not measured properly, the engine can heat up and expand. The rings can then butt together and then catch on an exhaust port.
wrote on 23 Dec 2022, 20:00 last edited byNah, if I hadn’t of gotten nearly 6000 trouble free miles I could agree with you. I knew the barrel was oval shaped when I first fitted it. Like I said it was a bit ‘slappy’ You could feel the excess movement in the front to back at TDC, side to side was OK. I just wasn’t expecting anything catastrophic!
I just find it really helpful to document my ‘happening’s’ in this thread for future reference. I used to write it down on all sorts of cardboard, pads & things but always end up misplacing it, let alone keeping date of things…
I need the data to work out the problems. At the moment I’d love to know if my engine RPM peaked so low normally or whether I have a miss-balanced crank that won’t let it rev to 10k+ -
Nah, if I hadn’t of gotten nearly 6000 trouble free miles I could agree with you. I knew the barrel was oval shaped when I first fitted it. Like I said it was a bit ‘slappy’ You could feel the excess movement in the front to back at TDC, side to side was OK. I just wasn’t expecting anything catastrophic!
I just find it really helpful to document my ‘happening’s’ in this thread for future reference. I used to write it down on all sorts of cardboard, pads & things but always end up misplacing it, let alone keeping date of things…
I need the data to work out the problems. At the moment I’d love to know if my engine RPM peaked so low normally or whether I have a miss-balanced crank that won’t let it rev to 10k+ -
wrote on 24 Dec 2022, 17:47 last edited by
Ditto my first rebore. It’s normal wear, front to back. There is no side to side pressure on a piston/barrel…
I have to make a list of bearings for a rebuild now. I don’t know whether to get the crank rebuilt and balanced though. I wish I could find somewhere that could check the balance…
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Ditto my first rebore. It’s normal wear, front to back. There is no side to side pressure on a piston/barrel…
I have to make a list of bearings for a rebuild now. I don’t know whether to get the crank rebuilt and balanced though. I wish I could find somewhere that could check the balance…
wrote on 27 Dec 2022, 19:06 last edited byThe top ring retainer pin came loose and worked it’s way out and up (in a bounceabout kinda way
) into the head and through the exhaust port. So luckily both rings are still intact and never made any shrapnel down into the crank 
. Just scratch (lol!) 1 head, barrel & piston…
Fitting a donor tomorrow I hope…MerryXmess!…
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The top ring retainer pin came loose and worked it’s way out and up (in a bounceabout kinda way
) into the head and through the exhaust port. So luckily both rings are still intact and never made any shrapnel down into the crank . Just scratch (lol!) 1 head, barrel & piston…
Fitting a donor tomorrow I hope…MerryXmess!…
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wrote on 27 Dec 2022, 20:05 last edited by
Like I said before, I didn’t measure, just a quick visual check in the barrel. It’s a jap Mitaka piston. I don’t blame the brand, it’s just a mechanical join between the aluminium piston and the brass pin that can fail in any brand piston, just bad luck
The piston had been overheated (judging by the black inside the crown) before I even brought the top end second hand. Couple that with possible vibration problems?…I think the rings were RIK from PJME…
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Like I said before, I didn’t measure, just a quick visual check in the barrel. It’s a jap Mitaka piston. I don’t blame the brand, it’s just a mechanical join between the aluminium piston and the brass pin that can fail in any brand piston, just bad luck
The piston had been overheated (judging by the black inside the crown) before I even brought the top end second hand. Couple that with possible vibration problems?…I think the rings were RIK from PJME…
wrote on 29 Dec 2022, 20:10 last edited byDay 1: 40 mile shakedown has shown no problems. Barrel & piston is a lot better condition/fit than the previous one, but by no means new. Choosy Beggars and wotnot
Rehoned the barrel before fitting so am being gentle with the revs to let the rings settle. Nothing above 6000rpm… -
wrote on 1 Jan 2023, 20:21 last edited by
Howdy, I'd love to answer your question but my tachometer does not function. If I fix it or get a digital guage I will let you know!
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Day 1: 40 mile shakedown has shown no problems. Barrel & piston is a lot better condition/fit than the previous one, but by no means new. Choosy Beggars and wotnot
Rehoned the barrel before fitting so am being gentle with the revs to let the rings settle. Nothing above 6000rpm…wrote on 2 Jan 2023, 19:21 last edited by SpookDog 1 Feb 2023, 19:29This post is deleted!