1984 500CR - Resto to Race

I have an 84 cr as well, it was also a 4 speed gearbox, but i found it difficult having the right gear at som corners, so a put a five speed gearbox from a later TC in and now its great to drive gears match under any circomstance on the track, and top speed is increased as well so on long straight pieces of the track, i don't hav to rev such high as with the 4 speed.

Hi Stu, that'd be great, thanks. No rush, just when you have time.

Kind regards
Lucien

Hi Lucien,

Here's some pics of my Silencer on and off the bike.

Stu

Stu,

Where did you get the front mudguard and the mudguard bracket from...Andy at HVA ?

Cheers,

Steve

Hi Steve,

Front mudguard from Andy but the brace was a generic one from ebay... hope that helps.

Stu

Hi Stu, you made that silencer yourself? That's very impressive. Wish I had that skill.

Sorry I should have paid more attention, it's the expansion chamber I'm interested in as mine rubs on my frame and to correct it involves twisting it on it's mountings which causes the rear silencer to stick out, which causes the side panels to sit away fromt the frame too much. I'm beginning to think I may have a 430 expansion chamber fitted to my bike (will post up another thread with some measurements) so probably will be in the Market for a new chamber for my bike - or will just bash in some neat dents so it doesn't rub on the frame

Kind regards
Lucien.

Hi Lucien,

No skill required by me... I just did the drawing for the end cap and had that spun... then had somebody else to weld it... Oh... I did cut the tube to lenght If interested I can reproduce it. Just PM me if you are interested.

With regard to your expansion chamber problem... This might work before you bash some dents in it. Mount the exhaust so that it doesn't hit the frame then cut into the joint (not all the way through but enough to allow you to adjust the alignment to the silencer) where the cone meets the exit tube. Once you have bent/aligned it you will have a gap which you can get somebody to fill or patch with weld. Might be cheaper than going and getting a new exhaust.

Hope that helps.

Stu

Hi Stu, thanks that's a very kind offer, but I'm pretty well stocked up on silencers though, probably need to shed a few if anything!

The problem with twisting the expansion chamber (and actually i added a cm to the little exhaust thingy that comes out of the cylinder) is that it not only causes the tail pipe to come out at the wrong angle but it also causes the long cone that runs back along the bike to stick out. I will have a play though!

Kind regards
Lucien

Ok guys I need some help here... Here are a few photos of my 84 CR 500. I can start this bike but it has a serrious kick back problem. First it damn near broke my right ankle... Then I started standing on a chair and kicking it through with my toes. After a few heat cycle starts it started kicking back worse and damn near severed my achilies tendon..... 44mm Sudco Mikuni carb... Jeted to factory spec. What is the corect timing? which direction would retard and or advace the timing? Should I advace it to see if it helps?

Sounds like your timing is advanced to far. Take cover off, use kicker to see which direction flywheel rotates, then looesen stator and turn opposite way just couple mm's and retry. My old 430 did that if I was advanced to far. But I think if it is retarded too much it will act the same. I'd also bring it up on TDC and look to see how timing marks line up. Sometimes I get that ass backwards, an others can chime in.

Nice lookin rockets!

Thanks Dart will do!!

Don't you mean the same direction. If the piston is already "Before" TDC or advanced, to retard it you would turn the stator towards TDC. Timing specs for a 500LC is roughly 2.64mm BTDC or 18 degrees BTDC. I'm not sure about the air cooled but can't be too much diference. If the bike is kicking back that hard the next thing that happens is you get a broke foot, or worse yet, a broken center case. You need a dial indicator to be 100% sure on the timing.

Yep.
Against direction of rotation = advanced .
With direction of rotation = retarded .
I always use a dial indicator.
Try 2mm as a start.