|
|
Post by sidney81 on Jan 27, 2021 20:29:02 GMT 1
|
|
|
|
Post by arrdy350 on Jan 27, 2021 20:51:47 GMT 1
Not seen a AC with LC top done before 😃
|
|
|
|
Post by 29davyt on Jan 27, 2021 20:54:09 GMT 1
That water pumps a work of art !
|
|
|
|
Post by veg on Jan 27, 2021 21:11:47 GMT 1
That’s what I’m building for my tz/Lc/ac flat tracker knew it had been done before but never really seen one so it’s great to see it in the flesh so to speak. 👍.
|
|
|
|
Post by sidney81 on Jan 27, 2021 21:21:09 GMT 1
That’s what I’m building for my tz/Lc/ac flat tracker knew it had been done before but never really seen one so it’s great to see it in the flesh so to speak. 👍. It's cool ain't it ,can't wait to see it apart |
|
|
|
Post by dusty350 on Jan 27, 2021 21:27:55 GMT 1
Looks great  I've seen a few done before but mainly with Tz top ends on ac bottoms. Andy - Spondon440 on here - had a Fahron top end on a 400e bottom end. Further evidence of how many parts were interchangeable on the 2 stroke Yamaha's of the late 70's and 80's. Nice that your boss has kept hold of it Chris - would make a nice special build  Dusty |
|
|
|
Post by muttsnuts on Jan 27, 2021 21:38:55 GMT 1
yeah my turbo project is an RD400E bottom end with 350LC barrels on that have been resleeved so its still 400cc, need to dig that prject back out and get it running again........I ran an electric water pump on it though......
|
|
|
|
Post by reedpete on Jan 27, 2021 22:00:09 GMT 1
There were even AC/LC mixed combinations, LC/TZ heads on AC barrels .
Aside from that thought is was fairly common knowledge that all RD 250/350 top ends from 1970 to 1983 plus TD/TR3 to TZG and 700/750 all interchangeable as the 54x54,54/64(66) and stud pattern is shared.
|
|
|
|
Post by sidney81 on Jan 27, 2021 22:02:14 GMT 1
Looks great I've seen a few done before but mainly with Tz top ends on ac bottoms. Andy - Spondon440 on here - had a Fahron top end on a 400e bottom end. Further evidence of how many parts were interchangeable on the 2 stroke Yamaha's of the late 70's and 80's. Nice that your boss has kept hold of it Chris - would make a nice special build Dusty it is dusty I'm going to keep on at him to do something with it !! |
|
|
|
Post by sidney81 on Jan 27, 2021 22:02:53 GMT 1
yeah my turbo project is an RD400E bottom end with 350LC barrels on that have been resleeved so its still 400cc, need to dig that prject back out and get it running again........I ran an electric water pump on it though...... that sounds very interesting Dave . |
|
|
|
Post by muttsnuts on Jan 27, 2021 22:18:59 GMT 1
yeah my turbo project is an RD400E bottom end with 350LC barrels on that have been resleeved so its still 400cc, need to dig that prject back out and get it running again........I ran an electric water pump on it though...... that sounds very interesting Dave . yeah, there is a build thread on here somewhere, I really need to get me finger out, but so daft busy its not funny, but I really do want to get onto some of my projects this year |
|
|
|
Post by dusty350 on Jan 27, 2021 22:35:08 GMT 1
|
|
|
|
Post by sidney81 on Jan 27, 2021 22:49:28 GMT 1
Cool dusty !! So would the 250 bottom take a 350 LC top then ? I know stud pattern is the same |
|
|
|
Post by donkeychomp on Jan 27, 2021 22:49:51 GMT 1
Love the safety gear. Ripped jeans and trainers...  Alex |
|
|
|
Post by 4l04ever on Jan 28, 2021 0:31:17 GMT 1
|
|
|
|
Post by steeley on Jan 28, 2021 6:13:14 GMT 1
Hi yes the lc top end will fit on ac bottom end . I had plans of building one when me and a mate restored a 250e . I was going to make clamp on rad brackets and was going to run an electric pump for cooling . Didn't happen in the finish.
|
|
|
|
Post by 2banger on Jan 28, 2021 9:08:41 GMT 1
Love the safety gear. Ripped jeans and trainers... Alex Yesterday that's all we needed. Now its leather romper suits |
|
|
|
Post by brigitte on Jan 28, 2021 12:13:02 GMT 1
Love the safety gear. Ripped jeans and trainers... Alex And ten inches of red hose from the garden.
Brigitte
|
|
|
|
Post by steven on Jan 28, 2021 17:54:10 GMT 1
I had an LC with an air cooled bottom end.
The LC side casing fits,the air cooled bottom end, and then you can use the LC,s own water pump.
You need to machine/drill the top of the air cooled cases, to pass the water pump pipe through.
Steven.
|
|
|
|
Post by dusty350 on Jan 28, 2021 20:23:42 GMT 1
Did you need to make provision for the end of the water pump shaft Steven ? The circular hole in the crankcase on the water cooled engines ? Dusty |
|
|
|
Post by spondon440 on Jan 28, 2021 20:59:54 GMT 1
The back tyre on that yellow RD looks as flat as a witches tit. Andy |
|
|
|
Post by spondon440 on Jan 28, 2021 21:06:10 GMT 1
TZ250 and 350G water pump fits on where the oil pump goes and runs the same way, its all there straight on.
I have one if anyone wants to spend a lot of money, think fondseca have remade them.
Andy
|
|
|
|
Post by steven on Jan 30, 2021 13:57:07 GMT 1
Did you need to make provision for the end of the water pump shaft Steven ? The circular hole in the crankcase on the water cooled engines ? Dusty Hi Dusty, I honestly cant remember, I didn't convert it, I actually bought it years ago. I still have everything, except the bare A/C engine, which I gave away. I didn't realize it was an A/C bottom end, everything else looked like an LC to me at the time, but the front / engine mounts had been converted to take the A/C engine...this was late 80,s early 90,s Sorry,I don't remember anything about the water pump shaft, and as i said, I gave the engine away. I used the bike for 2 years as a beach bike when I lived on the coast, and it went fine, getting the shite revved out it up and down the beach regularly for a couple of years. Then I stripped bits of it for other things, but i still have the frame and logbook, im sure its the 350 barrels off it thats on my current LC. Sorry I cant be more help, it was a while ago. Steven. |
|
|
|
Post by dusty350 on Jan 30, 2021 15:47:12 GMT 1
No problem Steven Just wondered if a mod was done for the water pump shaft when an Lc case was used. It would seem the easiest and probably cheapest option Dusty |
|
|
|
Post by donkeychomp on Jan 30, 2021 22:25:38 GMT 1
I'm intrigued here. It seems like an awful lot of work to do, so what are the advantages?
Alex
|
|
|
|
Post by reedpete on Jan 31, 2021 14:06:09 GMT 1
I'm intrigued here. It seems like an awful lot of work to do, so what are the advantages? Alex It’s an easy power upgrade for an Aircooled bike or budget TZ drop in lump. can also be done all with plug and play without frame mods etc. not intended to be used in an LC chassis. |
|
|
|
Post by dusty350 on Jan 31, 2021 14:17:31 GMT 1
Hi Alex, Good question ! If you had an aircooled 250 bottom end you could fit 350 Lc cylinders, as well as head/carbs/oil pump, for a fair power increase, but as you say, a lot of work and cost. Like for like, a 250 Lc was only about 5bhp better than an aircooled 250, but the aircooled bike was a fair bit heavier than an Lc - at least 20kg if I remember correctly, plus you add a rad on as well. A good 250lc should show a good 250ac a clean pair of heels in most situations. Stick a Tz top end on though, and it's a different ballgame. The early Tz's engine architecture was very close to the aircooled bottom ends - ac bottom ends are regularly adapted to Tz spec - it's not a lot of work - but obviously clutch and gears are different as well as the genny side. Fitting a complete Lc engine into an ac frame is no easy task, there will be cutting and welding to do, rad mounts etc, so a top end is probably the easiest way to "Lc your Ac" ! The Lc top end can run tighter tolerances though due to the water cooling, so more potential for reliability/tuning I would say Dusty |
|
|
|
Post by veg on Jan 31, 2021 14:37:12 GMT 1
Alex once my new garage is built I’ll be starting in earnest my flat track build, I needed a twin shock frame but wanted an Lc or tz top end as dusty says fitting an Lc motor to the ac frame isn’t easy so I decided to go ac frame ac bottom end etc with Lc top end.
I did look at buying another tz top end but they’ve now become prohibitively expensive my Lc tz top end cost me £700 for barrels and head plus probably another £1500 for all the bits, intake rubbers Reed blocks pistons nikasil lining etc
A tz700/750 top end today is upwards of £1500 plus all the above.
It’ll give me the look I’m after which is early Lc/tz powered flat track without the expense of a tz and champion frame.
|
|
|
|
Post by donkeychomp on Jan 31, 2021 22:32:00 GMT 1
Thanks lads! I didn't think of the TZ connection...makes sense now.
Alex
|
|
I've seen a few done before but mainly with Tz top ends on ac bottoms. Andy - Spondon440 on here - had a Fahron top end on a 400e bottom end. Further evidence of how many parts were interchangeable on the 2 stroke Yamaha's of the late 70's and 80's.
