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@mhbikesnbits said in My DT125 80s Yz style DT200 build one to watch!:
More work to the engine barrel and head cleaned every engine component now finished cleaned ready for powder coat
Firstly this is an amazing build and coming together well; I'm only sorry I didn't pay attention from the beginning as I now have lots of catching up to do!!
Very interesting to look at pics of the combustion chamber; the squish band is huge and has to occupy around 75% of combustion chamber area as an estimate. Just had a read of the cylinder head chapter of A. Graham Bell's two-stroke tuning book and this puts the combustion chamber design in racing kart engine territory. Apparently kart heads are like this because they're heavily loaded pulling out of slow corners and this boosts torque and reduces the possibility of detonation but does sacrifice some top-end power (on the other hand road race engines can run very thin squish bands to be more efficient at high rpm).
This could mean (subject to other critical engine dimensions) the DT200R 3ET develops a very linear power delivery similar to KDX200s and stuff like that, just what you need for enduro/greenlaning. Thanks for posting up the pics, the DT200R is so rare in the UK I've never had the chance to look at one before!
@HOTSHOT-III thanks for kind words about the build, I have read before the 200r engine has plenty of low down torque, pretty popular for the green leaning and enduro too wonder what Yamahas idea was for the design especially for it only been targeted towards certain country’s
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@mhbikesnbits Yeah I would love to shave off as much weight as possible on my DTR.
Another good one is to grab a lithium battery. That's a tremendous amount of weight saved!
@Calum dam like the ideas , titanium bolts and lithium battery , really good ideas makes the wallet more empty tho
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All the important bits for the project are here loom , cdi , sevo and the other electrical goodies,
Also the split pipe got some more work to do now ,l it’s mounting up
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Would have been rude not give the pipe a ultrasonic bath after waiting so long to find one
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Would have been rude not give the pipe a ultrasonic bath after waiting so long to find one
@mhbikesnbits wow that came up good.
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Would have been rude not give the pipe a ultrasonic bath after waiting so long to find one
@mhbikesnbits
Shiny! What you gonna rust proof it with? Not sure if they were painted or plated from new?...Should of got him to send another ally swingarm while he was at it! Gold dust here...
SpookDog...
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@mhbikesnbits
Shiny! What you gonna rust proof it with? Not sure if they were painted or plated from new?...Should of got him to send another ally swingarm while he was at it! Gold dust here...
SpookDog...
@biohazard13 I haven’t seen one in picture before cleaned up tbh was thinking Of spraying it silver ro match the other bits of silver , if I’m honest got the pick of a lot of parts off the guy as I’ve gotten quite friendly with him so I’m going accumulate a lot of spares
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Cheeky nos, must be pretty rare
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Concentrated on cleaning the casted finish off on the swing arm today the plan is to polish the smoother bit of the arm and keep the casted bit as norm to have less maintenance on the shine
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Had this made it’s those little details that add thay extra shine sometimes
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Had this made it’s those little details that add thay extra shine sometimes
@mhbikesnbits Class touch
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@mhbikesnbits Class touch
@Calum feels like it should be the last thing to put on but the headlight cluster will be in the way abit
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I keep doing bits and researching bit and pieces but more and more work mounts ups hard to find the time sometimes , would like to get the swing arm done soon need the bearings for the suspension leg ordering and upgrade the rear shock for a YSS shock as a nice upgrade as the suspension really lacks front and back on the dts (I have nice trick up my sleeve for the front suspension), should have a nice base for the bike then and I can sit on a stand before it’s too heavy for lift off the table
the Latest work I’ve done is take the tank back to bare metal quite lucky with my tank seems a real good one like not dented up and clean inside
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£500 for get my hubs drilled into brand spanking gold alloy 21 inch and 18 Inch rims with stainless spikes built and balanced not too shabby I don’t think
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Work in progress - side to side shot of how the loom is now and what it’s going to be like when it’s redone, crap weather has wrote off my plans to spray the swing arm after spending hours on prep this weekend too cold now
On the left is how the loom is now with crap sticky electrical tape and on the right is the work in progress loom fabric I’m doing
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As part of the build I wanted to upgrade the spongy outdated suspension the dt125r has, one option I Did ponder was swapping the shock spring from the XT600 onto the DT shock but I decided the best upgrade in my opinion would be the YSS Shock, really looking forward to getting this on now I’ve seen it looks real sexy and got some nice adjustment options on it.
Gotta get this swing arm done!
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As part of the build I wanted to upgrade the spongy outdated suspension the dt125r has, one option I Did ponder was swapping the shock spring from the XT600 onto the DT shock but I decided the best upgrade in my opinion would be the YSS Shock, really looking forward to getting this on now I’ve seen it looks real sexy and got some nice adjustment options on it.
Gotta get this swing arm done!
@mhbikesnbits Very smart, I got a YSS on my RS and I'm happy with it. But I probably ought to consider an upgrade on the DTRE. It's always been good enough for my uses however, plus I have larger dog bones fitted so height wise it's spot on for me.
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@mhbikesnbits Very smart, I got a YSS on my RS and I'm happy with it. But I probably ought to consider an upgrade on the DTRE. It's always been good enough for my uses however, plus I have larger dog bones fitted so height wise it's spot on for me.
@Calum you helped sway my decision tbh seen a few recommendations from you for the YSS on some old posts on here
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Little update some minor changes, originally decided a Matt finish for engine hangers went with a gloss finish think it’s a improvement.
Installed some electrics
Still perfecting the swing arm put lots of work into it getting it to a perfect standard
Had a little play making it look more like a bike
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Took one for the team and purchased the expensive seal and bearing kit from eBay for the suspension knuckle.
hopefully be able put together all the sizes for the forum so you can source it individually.
Plenty of grease used inside.
I used the method of threaded rod for install.
Decided to install the shock to the frame also looking great on the bike I must say
On a side note smart phone camera are great but sometimes pictures don’t speak a thousand words looks way better in person.
Looking forward to getting some professional pictures done when complete
