Learning about two strokes

**Motu** · 20th January 2006, 14:10

I don't know what sort of puller you need for the flywheel,I have some here....but a cheap trick with Honda's was to use the rear axle,it had the same thread.Most gaskets have a thermo setting sealer impregnated into the material,so even if they look perfect,they aren't.But if you are real skint a high quality silicon could be used....I'd be inclined to use something pretty good on the base gasket,you'll have more compresion with the new piston - what most don't realise is that you also will have far more crankcase compression,and I've seen just new rings blow out base gaskets.

Oh,the corrision around the studs is fairly normal,but not perfect - use anti corrosion grease on them.

**WRT** · 20th January 2006, 14:15

Thanks guys for all the advice. Will be working on it again over the weekend and will report back with a progress update and maybe some more piccies.

Fingers crossed it will all go smoothly and I'll have it back together shortly!

**cheese** · 20th January 2006, 14:38

yes then you can come practice falling off at woodhill with me.

**Brian d marge** · 20th January 2006, 15:45

Just a thought
I have a good few CR engines around the places, 5 crank shaft assemblys crankcases , gearboxes etc ..and a digital camera ....
If you need any clear photos or more detail ,,,Just ask ...easy as
Even I ,,the Master of all cheap baskets ( I even make my own gaskets !! ) ..went out and bought the flywheel puller ..

When reassembling the flywheel, The KEy is only there to locate the flywheel , you need to lapp the taper with fine grinding paste as its the Taper that does the holding NOT the nut ,,IF you dont it WILL come loose ...( dont ask me how I know !)

I have parts books right through to the Me 03 19 heisei 8 which would be the 98 model ,

the prices havent change that much !!!!

can scan if reguired ?

Stephen My cr at the moment is a frame ..,,I have reshimed the Rebound Stacks in the front fork, for the heaviest springs 0.42kg/mm that Honda do ( would like 0.44)
Shortened the swingarm by 5mm Used a 125 one

Overhauled the rear shock ,,,twas Shagged !! ,,,So now its clean up time and back together ...

Stephen

**cheese** · 20th January 2006, 16:01

Why shorten the swingarm?

**Brian d marge** · 20th January 2006, 16:19

Our tracks are real tight and twisty you hardly can get into second gear ...I wouldnt call them MX tracks more like Supercross tracks

Stephen

**Brian d marge** · 20th January 2006, 19:03

Just a thought while I was sitting here at work,,,eerrrrrr working The cranks on Honda CR The only reason they are diffiicult to rebuild is that there is a thin disk on the Crank Flywheels To take up the volume of the crankcase, and If I remember My BSA bantams the Horse shoe collar crankcase stuffers were all the rage and didnt really work.
I wonder how or what effect it would have If I removed said disk, Then I could freely rebuild the cranks.
I could imagine a little bit of throttle response, ( turbulance reduced , A slight loss in Hp ,,,Doesnt worry me )
I have an rooted crank round some where I will rip it apart and see......Then I could buy a stack of rod kits and Jet so lean it hurts baby !!!!

Just a thought

Stephen

**cheese** · 23rd January 2006, 08:02

Oh god I was riding out on that RMCC farm ride and my crank seals wnet adn I was the local smoke machine! So I'm now going to give mine a go and split the case and shit.

Man the wife is PISSED at my bike cause it keeps breaking down!!! Rm means

Regularly munted
repair monthly
etc etc

dam money hole!!!

**WRT** · 23rd January 2006, 10:27

Cheese - damn, sorry to hear about that mate, not good. Was that just this weekend?

Meanwhile, I went to Super Cheap on Sat morning, got myself a gear puller to remove the flywheel. The smallest they had was a 3" one, took it home and whaddya know - fidnt dit. The arms are just too big. So I shot over to the old mans place and had a go on his grinder for a bit (nothing like buying a brand new tool and feeding it into the grinder less than an hour later - but that's what you get for buying cheap tools, eh?). Took it home, still too big. Back to Dad's (he lives about a 25min drive away, dammit) ground it down some more. Took it back home, and bingo! The arms now will fit under the flywheel.

So, should all be plain sailing now, right? Not likely . . . now when I reassembled the arms back onto the triangular bracket at the top of the puller, the bracket pushes the arms too far apart. So now I need to go back to Dads, use his grinder again (this time on the bracket) just so I can get this bloody flywheel off.

So, no progress to report . . . and I'm not doing another special trip over to the old mans to use his grinder, I'm over his way on Tuesday after work so will do it then. Probably best that the engine and I have a little cooling down period anyway, I was about ready to start disassembling it with a hammer!

**cheese** · 23rd January 2006, 10:50

LOL I know that feeling.

I'm going to try to do just the seals and see how it goes.

little fucker.....

**cheese** · 23rd January 2006, 12:37

Hey WRT, we could both do the 4 hour with RMCC and at least one of our bikes would finish.... LOL

http://www.rmcc.co.nz/event.php?id=70

**WRT** · 26th January 2006, 09:37

Ok, so after much wailing and gnashing of teeth, I managed to get the flywheel off last night. Now I've just got to find a way to hold the drive sprocket while I undo it, and I should have the case cracked (badum-chish!). Its been no small job for a simple fella such as myself.

Unfortunately thats all the time I've got to spend on it this week as I've got the day off tomorrow to head down the line for the long weekend. Roll on next week, will keep you all posted as the saga continues . . .