FAST GATER Posted October 24 Report Share Posted October 24 (edited) 2 hours ago, Daniel Smith said: What used to be enjoyable about uprights & earlier laydowns was their unreliability. Every race was unpredictable in the sense that even if a rider was miles in front they could (and did) breakdown at any point. Most breakdowns now are just dropped / snapped chains Used to be quite often problems with the mag ,some said that one's put on by Jawa in the 70's were off cement mixers . Edited October 24 by FAST GATER Quote Link to comment Share on other sites More sharing options...
THE DEAN MACHINE Posted October 25 Report Share Posted October 25 (edited) 3 hours ago, FAST GATER said: Used to be quite often problems with the mag ,some said that one's put on by Jawa in the 70's were off cement mixers . The mags on Jawa and japs were quite temperamental, some worse than others, thing is back in the day they were used on pretty much every engine so you got many different makes and models used especially on japs, on the engines themselves having rebuilt a few japs now I’m surprised they lasted till the 60s, especially the early ones,,they were real flintstone technology,they didn’t have gaskets so oil literally came out of every join, obviously they weren’t back then because there was no such thing but the 2 chrome pushrod tubes on the front of the engine are now replaced with cut down shower curtain rails with a bit of bicycle inner tube in the bottom as a seal,when the 2 valve Jawa came along is was a massive step forward in quality and reliability Edited October 25 by THE DEAN MACHINE 1 Quote Link to comment Share on other sites More sharing options...
*JJ Posted October 25 Report Share Posted October 25 Dean, have you still got that GM engine I sold you a few years ago? You said that you were going to convert it to upright. Quote Link to comment Share on other sites More sharing options...
Byeall Posted October 25 Report Share Posted October 25 (edited) I liked the good old days of racing with the 2 valves.Todays machines seem wrong for the tracks Edited October 25 by Twistthatthrottle 1 Quote Link to comment Share on other sites More sharing options...
THE DEAN MACHINE Posted October 25 Report Share Posted October 25 9 hours ago, *JJ said: Dean, have you still got that GM engine I sold you a few years ago? You said that you were going to convert it to upright. I use the head on one of GM uprights Quote Link to comment Share on other sites More sharing options...
FAST GATER Posted October 25 Report Share Posted October 25 8 hours ago, Twistthatthrottle said: I liked the good old days of racing with the 2 valves.Todays machines seem wrong for the tracks They look ugly without covers on ! 1 Quote Link to comment Share on other sites More sharing options...
Bald Bloke Posted October 25 Report Share Posted October 25 2 hours ago, FAST GATER said: They look ugly without covers on ! So do i. 3 Quote Link to comment Share on other sites More sharing options...
AFCB Wildcat Posted October 28 Report Share Posted October 28 On 10/25/2024 at 6:36 PM, THE DEAN MACHINE said: I use the head on one of GM uprights Can I ask if your original intention was to convert the whole engine to upright? If so, could you advise me on what alterations would be required in order to mount it in an upright frame? I ask because I have a Jawa 898 engine which had been converted from upright to laydown, I believe by Lew Coffin. Now that its been redundant for a good few years, I want to mount it in a PJ upright framed chassis that I have. I've got all the external components required, but am unsure what changes would be required to the engine itself. Quote Link to comment Share on other sites More sharing options...
THE DEAN MACHINE Posted October 29 Report Share Posted October 29 12 hours ago, AFCB Wildcat said: Can I ask if your original intention was to convert the whole engine to upright? If so, could you advise me on what alterations would be required in order to mount it in an upright frame? I ask because I have a Jawa 898 engine which had been converted from upright to laydown, I believe by Lew Coffin. Now that its been redundant for a good few years, I want to mount it in a PJ upright framed chassis that I have. I've got all the external components required, but am unsure what changes would be required to the engine itself. To convert, basically you have to move the sump/oil pick up so as it’s on the bottom when the engine is upright and the oil pipe (internal or external depending on engine) is above the center of the main shaft also the flywheels have to be rebalanced, unfortunately quite a few that were converted to laydown had the sump chopped off and welded up and a new one was machined further round the cases so it’s not really possible to convert them back, the first laydown GMs had both upright and laydown sumps on so easy to convert either way 1 Quote Link to comment Share on other sites More sharing options...
Goneforgood Posted Sunday at 04:05 PM Author Report Share Posted Sunday at 04:05 PM THREAD NOW CLOSED. Quote Link to comment Share on other sites More sharing options...
The White Knight Posted Sunday at 05:28 PM Report Share Posted Sunday at 05:28 PM 1 hour ago, Goneforgood said: THREAD NOW CLOSED. Sorry but why are some of these very interesting Threads being closed? Quote Link to comment Share on other sites More sharing options...
Byeall Posted Sunday at 07:24 PM Report Share Posted Sunday at 07:24 PM Personal attacks have caused Youhave2minutes to resign. The offenders know who they are. Quote Link to comment Share on other sites More sharing options...
Fromafar Posted 13 hours ago Report Share Posted 13 hours ago On 11/10/2024 at 7:24 PM, Byeall said: Personal attacks have caused Youhave2minutes to resign. The offenders know who they are. Give it a rest your getting embarrassing with all these stupid posts. Quote Link to comment Share on other sites More sharing options...
Fromafar Posted 13 hours ago Report Share Posted 13 hours ago On 11/10/2024 at 5:28 PM, The White Knight said: Sorry but why are some of these very interesting Threads being closed? They are not closed . Quote Link to comment Share on other sites More sharing options...
The White Knight Posted 9 hours ago Report Share Posted 9 hours ago 4 hours ago, Fromafar said: They are not closed . Sorry, I realised that about a day after I posted. Put it down to age. 🙄 Quote Link to comment Share on other sites More sharing options...
Fromafar Posted 8 hours ago Report Share Posted 8 hours ago 4 minutes ago, The White Knight said: Sorry, I realised that about a day after I posted. Put it down to age. 🙄 No need to be sorry it just the usual suspect playing about.👍 1 Quote Link to comment Share on other sites More sharing options...
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