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Author Topic: RAT BUILD  (Read 1136 times)

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Offline chopperpilot

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Re: RAT BUILD
« Reply #20 on: September 05, 2021, 08:30:48 am »
DR 500s in oe trim
Exactly the one of my buddy.

Tank and side panels are fine.

Aftermarket fenders need replacement.

Engine has a few small oil sweats. Gasket sealer evident too.

Need a new/another header pipe. Maybe Powerflow in Durbs kan make.

Any advice on engine gaskets, as well as new spokes?

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  remember to keep the collar on the end of header pipe and weld it to a new one, gaskets propably make you own or gasket maker. spokes a bbreakers yard  and replate. Most spares obsolete now, check e bay they come up every now and then. spokes could made from someone like central wheel. lots of scrappers around for bits. look after your rockers they like are rocking horse shit.
Appreciate the advice.

I will try and make most gaskets. Hate the RTV stuff, but believe it can be applied correctly/conservatively.

The spokes are still intact, so I'll be soaking them with penetrating oil and patiently loosing them. Plating then.

What is your plan with the headgasket?

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Offline desertfox

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Re: RAT BUILD
« Reply #21 on: September 05, 2021, 09:55:37 am »
 :sip:
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Offline 2StrokeDan

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Re: RAT BUILD
« Reply #22 on: September 05, 2021, 10:34:10 am »
If you have the engine stripped to it's last part, then the way to go is to dress the gasket surfaces on a surface table, or emery paper on a sheet of glass for flatness.

Then assemble with something like Wurth's grey silicone or Yamabond or Reinzosil.

Just be careful,sometimes the clutch casing is the stopper for a gearshaft or kickstart shaft, and gasketless may give too little clearance.

Headgasket I would have a copper gasket made up, do not know where, but if you get the correct thickness copper sheet somewhere, you can cut your own.

Heat that copper gasket up over a gas stove and dunk it in cold water to anneal it.
 

Offline chopperpilot

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Re: RAT BUILD
« Reply #23 on: September 05, 2021, 11:14:51 am »
If you have the engine stripped to it's last part, then the way to go is to dress the gasket surfaces on a surface table, or emery paper on a sheet of glass for flatness.

Then assemble with something like Wurth's grey silicone or Yamabond or Reinzosil.

Just be careful,sometimes the clutch casing is the stopper for a gearshaft or kickstart shaft, and gasketless may give too little clearance.

Headgasket I would have a copper gasket made up, do not know where, but if you get the correct thickness copper sheet somewhere, you can cut your own.

Heat that copper gasket up over a gas stove and dunk it in cold water to anneal it.
Waardevolle kennis, dankie Danie!

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Offline Bikerboer1973

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Re: RAT BUILD
« Reply #24 on: September 05, 2021, 11:41:25 am »
 :sip:
 

Offline DR BIG 750

Re: RAT BUILD
« Reply #25 on: September 06, 2021, 04:59:39 am »
I had some head gaskes some where will try finf pic and recall where i had them made up, this . std head gasket quite thick the ones I made up were slightly thicker but was a oval copper type ring insert which probably squashed a bit under head tension, never the less worked will on the previous 2 motors.
« Last Edit: September 06, 2021, 05:03:31 am by DR BIG 750 »
twin shox, twin drum air cooled
 

Offline DR BIG 750

Re: RAT BUILD
« Reply #26 on: September 06, 2021, 05:06:24 am »
this pic was yesterday at Rhino park. it also came out squashed so went back pic , cropped it and fiddled a bit I see it is now a mirror image check suzuki sign and cars no plates ???
« Last Edit: September 06, 2021, 05:07:09 am by DR BIG 750 »
twin shox, twin drum air cooled
 

Offline Dustbiter

Re: RAT BUILD
« Reply #27 on: September 06, 2021, 06:10:23 am »
this pic was yesterday at Rhino park. it also came out squashed so went back pic , cropped it and fiddled a bit I see it is now a mirror image check suzuki sign and cars no plates ???

Daars hy!!!
« Last Edit: September 08, 2021, 06:40:48 am by Dustbiter »
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Offline chopperpilot

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Re: RAT BUILD
« Reply #28 on: September 06, 2021, 06:47:13 am »
I had some head gaskes some where will try finf pic and recall where i had them made up, this . std head gasket quite thick the ones I made up were slightly thicker but was a oval copper type ring insert which probably squashed a bit under head tension, never the less worked will on the previous 2 motors.
Thank you. I'm willing to do all gaskets by hand, but any help will be appreciated!

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Offline chopperpilot

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Re: RAT BUILD
« Reply #29 on: September 06, 2021, 06:49:57 am »
Daars hy!!!
A stunner for sure! Well done!

Love the white frame and fenders!

Any recommendations on replacement fenders!

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Offline Bikerboer1973

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Re: RAT BUILD
« Reply #30 on: September 06, 2021, 09:03:18 am »
I got a sheet of coper, the correct thickness and cut my own head gasket, warmed it up before installing and work 100%
 

Offline chopperpilot

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Re: RAT BUILD
« Reply #31 on: September 06, 2021, 09:34:23 am »
I got a sheet of coper, the correct thickness and cut my own head gasket, warmed it up before installing and work 100%
Dankie. Het jy nog left over genoeg vir nog ń gasket?

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Offline Bikerboer1973

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Re: RAT BUILD
« Reply #32 on: September 06, 2021, 12:41:17 pm »
I got a sheet of coper, the correct thickness and cut my own head gasket, warmed it up before installing and work 100%
Dankie. Het jy nog left over genoeg vir nog ń gasket?

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Offline BuRP

Re: RAT BUILD
« Reply #33 on: September 06, 2021, 12:47:42 pm »
I got a sheet of coper, the correct thickness and cut my own head gasket, warmed it up before installing and work 100%

Fwiw:
- If one heats up copper and let it cool off normally then the copper becomes hard, perhaps even brittle.
- If one heats up copper and then quenches it (dunk it into a bucket with cold water i.e sudden cooling) then copper becomes its soft and mallable self (not so with steel which then becomes hard!)
It goes without saying that the latter is wanted.

Oh, copper that has been deformed (like a used gasket or washer) also becomes harder, so to reuse it heating & quenching is advisable.
« Last Edit: September 06, 2021, 12:48:42 pm by BuRP »
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Offline Bikerboer1973

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Re: RAT BUILD
« Reply #34 on: September 06, 2021, 01:01:44 pm »
I got a sheet of coper, the correct thickness and cut my own head gasket, warmed it up before installing and work 100%

Fwiw:
- If one heats up copper and let it cool off normally then the copper becomes hard, perhaps even brittle.
- If one heats up copper and then quenches it (dunk it into a bucket with cold water i.e sudden cooling) then copper becomes its soft and mallable self (not so with steel which then becomes hard!)
It goes without saying that the latter is wanted.

Oh, copper that has been deformed (like a used gasket or washer) also becomes harder, so to reuse it heating & quenching is advisable.

What he said!

On my RM500 however I just heated it up every time between ring changes, didn't evenbother with water and used that one for a few years and sold it like that.
 
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Offline chopperpilot

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Re: RAT BUILD
« Reply #35 on: September 06, 2021, 01:39:45 pm »
I got a sheet of coper, the correct thickness and cut my own head gasket, warmed it up before installing and work 100%
Dankie. Het jy nog left over genoeg vir nog ń gasket?

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Jammer nee, was paar jaar terug gewees.
Dankie. Kan jy die dikte van die koper plaat onthou?

@DR BIG 750 What's the thickness of the old OEM head gasket?

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Offline DR BIG 750

Re: RAT BUILD
« Reply #36 on: September 06, 2021, 06:56:33 pm »
will measure a decent one tomorrow, that one is trashed and delaminated.
That yellow one is my enduro vmx one, built that one during initial lock down. this one is another build
twin shox, twin drum air cooled
 

Offline chopperpilot

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Re: RAT BUILD
« Reply #37 on: September 06, 2021, 07:16:43 pm »
will measure a decent one tomorrow, that one is trashed and delaminated.
That yellow one is my enduro vmx one, built that one during initial lock down. this one is another build
Appreciate!

What work did you do to the shocks and forks? Forks don't look original.

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Offline DR BIG 750

Re: RAT BUILD
« Reply #38 on: September 06, 2021, 07:24:29 pm »
it is running PE suspension and ally swingarm grafted on to DR frame . Fork rebuid quite simple. Rear end to soft for the track but vmx enduro type works well, then the white is for twin schock class but also to soft suspension, but flat trackin its a beasti and hold s its own.
twin shox, twin drum air cooled
 

Offline DR BIG 750

Re: RAT BUILD
« Reply #39 on: September 06, 2021, 07:44:50 pm »
Tis the track bike, the other white one is the origonal enduro version from factory , waiting in the build q
twin shox, twin drum air cooled