1988 bike
-
wrote on 22 May 2019, 00:40 last edited by
Frame gone to have the powder coating done again, damaged in storage unfortunately. Swingarm bearings hard to remove, powdercoated with bearings in place previously and proving a nuisance to remove. Bush in bottom of shock u/s of anyone knows where to source a new one? Fowlers?
Need spring compressors so that can be redone as well. Stripped off barrel and a lot of oil in cases though big end seems good, full rebuild coming up. -
@DTR-NSR
Its going to be all original with the exception of the operating power valve, has the original round slide carb. Will make other improvements only if its unseen, have a spare mikuni power jet carb but not changing spec. Rebore will take it up a little but have been told this is the last (safely) that can be done which is a shame as it will be used and not a show pony, although mileage will be limited (too many toys). Cases being blasted as whole engine has been sprayed as an assembled unit, the rest I can deal with at home.
Sorting bits for replating this week that I do have, don't think my usual supplier can do olive drab though. Got a list as long as your arm for spares needed so may have to sell another kidney!wrote on 22 May 2019, 08:15 last edited by@oldman could I ask why spray engine a assembled unit when you crack a bolt it will crack the paint
-
wrote on 22 May 2019, 09:04 last edited by
You will have to ask the person who did it, will be reassembled properly with metal cases and refinished side covers in dark grey metallic 2 pack
-
Frame gone to have the powder coating done again, damaged in storage unfortunately. Swingarm bearings hard to remove, powdercoated with bearings in place previously and proving a nuisance to remove. Bush in bottom of shock u/s of anyone knows where to source a new one? Fowlers?
Need spring compressors so that can be redone as well. Stripped off barrel and a lot of oil in cases though big end seems good, full rebuild coming up. -
wrote on 22 May 2019, 11:22 last edited by
@Calum will do Calum, left to soak in release spray as bolt seized solid but will measure when it comes out. Had a sort though of bits and need to find a helmet lock, last ones came from the States. Have another nearly new speedo though with 320 miles on it, just sorting in to piles for plating at the moment.
Ta -
wrote on 27 May 2019, 14:49 last edited by oldman
Have actually managed to find a second hand mb barrel with more life In it, just waiting for it to arrive, cylinder head cleaned and powervalve cleaned and polished. Loads of bits came from fowlers in prep for rebuild. Need overflow hose from rad to expansion bottle if anyone has one lying around (discontinued). Helmet lock ordered from Japan, genuine Yamaha ignition lock changed to 4 wire plug and earth, carb stripped and cleaned, waiting for frame to come back and frame parts I have ordered ordered to arrive from France and them can get those powdercoated and plated.
-
wrote on 28 May 2019, 22:52 last edited by
Removed swingarm bearings so that's ready to go for refurb, and finally removed rear shock lower bolt. Removed seals and found worn ball joint that seems to be pressed in to shock lower. Any advice if repairable or should I be looking for another rear shock?
-
wrote on 28 May 2019, 23:19 last edited by
My mistake, ball joint held I by 2 spring clips in recess of shock lower. Saw them when I enlarged pic posted. Have got the 2 clips out , heavily corroded, ball joint stuck fast. Left soaking on release spray, but still left with trying to find replacement unless find a nush that fits?
-
Removed swingarm bearings so that's ready to go for refurb, and finally removed rear shock lower bolt. Removed seals and found worn ball joint that seems to be pressed in to shock lower. Any advice if repairable or should I be looking for another rear shock?
-
wrote on 29 May 2019, 17:12 last edited by
@oldman they are not serviable as far as I am awake.
Thanks Calum, ordered one from Portugal (second hand) that looks good without rust for a reasonable price. Other 3bn barrel arrived today freshly rebored @1.25 over standard, and has been tuned. No id marks to say who did it , messaged seller to see if he knows. Mick Abbey marks his work as far as I am aware so doubt its him. Be good to know though and a bonus it's done. Will post a pic up later.
-
wrote on 29 May 2019, 17:18 last edited by
-
@oldman they are not serviable as far as I am awake.
Thanks Calum, ordered one from Portugal (second hand) that looks good without rust for a reasonable price. Other 3bn barrel arrived today freshly rebored @1.25 over standard, and has been tuned. No id marks to say who did it , messaged seller to see if he knows. Mick Abbey marks his work as far as I am aware so doubt its him. Be good to know though and a bonus it's done. Will post a pic up later.
wrote on 29 May 2019, 18:56 last edited by@oldman What engine are you fitting this to?
3MB barrels and 3BN barrels are not interchangable!
The 3BN has a larger bore, therefore shorter stroke. If you fit this onto an engine designed to have a 3MB cylinder, you could risk the piston hitting the cylinder head.
It is very minimal, but they are different strokes.
-
@oldman What engine are you fitting this to?
3MB barrels and 3BN barrels are not interchangable!
The 3BN has a larger bore, therefore shorter stroke. If you fit this onto an engine designed to have a 3MB cylinder, you could risk the piston hitting the cylinder head.
It is very minimal, but they are different strokes.
-
wrote on 29 May 2019, 21:07 last edited by
By the way, I mean the 88 bike I am building (endurance blue), not the red one.
-
@Calum it's the 88 bike engine, same as the barrel that came off, 89 bikes changed to accommodate new carb amongst other things, is that right? Matching frame and engine nos so original engine
-
wrote on 30 May 2019, 09:01 last edited by
Will not need to though if it's an 88 engine? Just need to make sure crank is correct for stroke, will check part nos to be sure.
-
Will not need to though if it's an 88 engine? Just need to make sure crank is correct for stroke, will check part nos to be sure.
wrote on 30 May 2019, 09:10 last edited by@oldman If it was running a 3MB and you put a 3BN barrel on it, the stroke will be too long. Is it the crank, is it the rod? I don't know. But the stroke is definitely different. So you will want to make sure you have clearance.
-
wrote on 30 May 2019, 09:10 last edited by
Checked fowlers for part no, con rod for 88 listed as separate item, later years checked a(89 and 1990) and shows discontinued with no part nos? Have ordered a genuine 88 one to be sure but any info you have useful? Original barrel was already 1.75 over hence the replacement
-
wrote on 30 May 2019, 09:14 last edited by
It's definitely an 88 bike and engine, the barrel was consistent with engine and I did have a spare 3mb barrel but sourced like for like. Cant be sure con rod in engine is correct hence ordering correct one from fowlers. Could be whole crank differs from later bikes but don't know (yet) will check clearances as built, lucky to find a matching barrel to be honest
-
It's definitely an 88 bike and engine, the barrel was consistent with engine and I did have a spare 3mb barrel but sourced like for like. Cant be sure con rod in engine is correct hence ordering correct one from fowlers. Could be whole crank differs from later bikes but don't know (yet) will check clearances as built, lucky to find a matching barrel to be honest
wrote on 30 May 2019, 09:52 last edited by@oldman Yeah this.
The manual specifies both the bore and stroke for the 3BN, I'm sure. I don't have it to hand.
It is so minor I doubt it'll be too much of a problem. Powervalves are not interchangeable though.
As said, doubling up on base gasket will do the trick. My worry is that the con rod is designed to stretch and compress, how close will it be at 12k RPM is anyones guess!