Wrong stroke, too many cylinders, but...

[002]

Whats the VR on the Jawa? If it's mechanical I'd want it off ASAP, they can be horribly unreliable and inefficient.**

I remember the hours of fun cleaning the points and adjusting them.
Trying to get them to charge on my many MZs and Jawa/CZs.

Jethro

[SteveC#222]

I believe some club members advocate stopping Eastern European two stroke sidecar outfits using hedges and walls.  

GC

You haven't lived until you've tried the brakes of a 175 Voshkod!!...5" drum made of case hardened porridge and brake liners of soap!  

I fitted an old MZ front wheel ( the one that everyone replaces with a Honda TLS coz it's useless) and it was a vast improvement!!

[guest18]

Do I take it that the bike's alternator is charging the car battery? ( replacing the bike battery)

If so, a word of warning.  They did this a lot  in the Cossack club. No problems as long as the car battery is fully charged. However, if the battery has gone a bit flat and you try and recharge it by just going for a run on the bike, you can burn out the alternator! 

You can do this with a bike battery. No vehicle system is designed to deal with anything more than what's used to start the engine. The problem is cooling, made worse on most bikes by having the alternator bathed in boiling oil.

If you fit a car battery you gain nothing in terms of over all capacity, you can't suddenly run a bank of spotlights and three heated jackets. What you gain is a battery that will hold enough charge to start the engine at low temperatures (half of 60 Ah is a lot of cranking, half of 8 Ah and you have to hope the coil is good and the carbs are right), plus, a replacement Ford Escort battery is £30 rather than £80. At low temps you don't have the charge issue as the capacity has dropped, you will have to replace the lost charge as the battery warms up but that's a lot more gradual than starting with a battery that's half discharged and wants charging*. On a bike with a kickstart and a very small alternator I'd wonder why anyone would go to the trouble of fitting a car battery, the bike battery charges faster plugged in to the wall and the kicker gets you going on cold mornings.

* For those readers of this site who think in terms of electrical pixies, the pixies get hot and bothered carrying buckets of pixie food from the alternatior (food factory) to the battery (cupboard). The pixies want the battery to be full and will fill any unused space as quickly as they can. When there is only a little space they fill it up and can take a rest, when there is too much space they kill themselves working to get the job done.

Whats the VR on the Jawa? If it's mechanical I'd want it off ASAP, they can be horribly unreliable and inefficient.**

** The Pixies don't like moving the big heavy gate that's there to stop them overfilling the battery, so they don't bother if they can avoid it. They only bother when the battery is almost empty and then they struggle to fill it up. The gate has a habit of falling off it's hinges.  

Andy

Lol Andy, your pictsies explanations are priceless, and surprisingly effective 

[002]

If we get the Jawa back on the chair then this will be the first sidecar-braked outfit I will have ridden, I'm looking forward to seeing how that works out.

Ha Ha Ha !  You Think you will Notice  !
Mind with the Jawa brakes you do need all the assisstance you can have 

Jethro

[guest27]

The guy who bought the Jawa 500R from me put a nice disk on the front - replacing the TLS that was there, which was a replacement for the SLS it came with (the 500 lump was put into a 350 stroker in the UK? Front end modded?)

There are some pics about here some place

R

[002]

The guy who bought the Jawa 500R from me put a nice disk on the front - replacing the TLS that was there, which was a replacement for the SLS it came with (the 500 lump was put into a 350 stroker in the UK? Front end modded?)

There are some pics about here some place

R

Yes !  And the disc front end was fitted to both the 500R and CZ125/180 and Jawa 350 Two-Strokes

Jethro

[Ian]

Reading the posts on here suddenly makes me realise how little I know about bikes...

Ian

[002]

Just flicking through some of my manuals and the alernator output 14V/15A  so not a lot at all.
And the brakes are 160mm all round.
Jawa/CZ used the same hub for all 3 wheels on thier outfits.
Rims on the bike are the same 18",so they are interchangable but the sidecar has a 16" rim.



Jethro

[robG]

Just flicking through some of my manuals and the alernator output 14V/15A  so not a lot at all.
And the brakes are 160mm all round.
Jawa/CZ used the same hub for all 3 wheels on thier outfits.
Rims on the bike are the same 18",so they are interchangable but the sidecar has a 16" rim.
Jethro

How big are the buttons on your JAWA anorak 

Rob.

[guest7]

Hang on, that anorak could be useful...

Bike ran yesterday after a points clean and carb clean out. However, I need to change the engine oil and I have no info on what grade and how much, etc. Also, as some numpty has binned the airbox and fitted a K&N filter, i need to know what the standard jet sizes are so I can tell if it's been jetted to suit.

My thoughts are to find a new airbox and put it all back to standard, but in the meantime if it will run with the filter then that will be fine.

GC

[Richard]

Change the engine oil ??

Its a two stroke, if it has engine oil it has broken down.

You've been rdiing around on Thumpers for too long.

(where did I put that jacket ?)

Richard

[Steffan]

Graham,
 I am so embarrased on your behalf that I have had to pull the hood up on my anorak - engine oil indeed       

Steffan

[guest27]

So then my Suzuki stroker has injector oil to the big ends and the mains are oiled by the non-sacrificial gearbox / engine oil.

Mind I did have a friend run a Fizzy for many months before he discovered that the engine drain bolt was missing and he had been running the gearbox pretty much dry.

R

[Richard]

Hehe.  Older MZs ran gearbox oil in the mains as well, with no pump I doubt its efficacy though.  Lots of injection equipped two strokes put the oil onto the big ends in the first instance but the MZ, Jawa/CZ systems just dribble it into the crankcase.

Lots of folk convert the MZs into premix and owners will argue at length about the merits of each.

I guess a total loss oil system means they have something in common with Brit Singles though  !

Cue flame wars.

Richard

[trophydave]

Lots of folk convert the MZs into premix and owners will argue at length about the merits of each.

Richard

Nooooooo,not the premix/autolube debate.