92mph? My new Project, Racing mower! Craftsman / Jonsered LT12

Thunderdivine wrote:

prometheusEDI wrote:

yes, I suppose you have a point. Still, Ive never seen an opposed twin idle that high. You mention the leaky intake, I would look there to solve that problem. Otherwise, if it works for you, then it works for you.

Its not leaky as such, and ive seen loads on you tube.
Whats the idle at if you should guess? My guess is max 1500rpm

I got the repair manual, will do a read up on idle speeds since these have many idle settings.

But dont get fooled by the "Look how low mine can go" vids cause they wont get good cooling if below 1000-1200rpm.

Also remeber we have 98 octane gasoline in the pumps, thats racing fuel to you guys so it might just even be a run-in thing.

Anywho i got far more serious things to sort out than a high idle setting

Quite familiar with proper idle adjustments with the opposed twins... I ran them most often at an even 1000 rpm.

I might get to "Waterjet" Cut more parts tomorrow, - Front steering axle support and front A-Arm brackets. Tho ive kinda re-designed the front steering axle support already (in my head). Will use this 'U' Design for both Front & Rear supports, I think.

Rear Steering axle support/ mount,

im very curious how you are doing the front of the steering.... I like how what you have looks

redlinemotorsportts wrote:

im very curious how you are doing the front of the steering.... I like how what you have looks

Why? It will be like this

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My plan for the front, Steering wheel and A-arm mount.



Side view, Note that Ive angled the A-Arm mounts to give it better handling.

Thunderdivine wrote:

Btw you can see when i throttle up the clutch engages. And it does engage at 1700rpm so its not that high, maybe 2-300rpm to high. Tho I've read these should not idle below 1200rpm since its splash lubed.

Leaky intake for sure.

Chopperhed wrote:

Thunderdivine wrote:

Btw you can see when i throttle up the clutch engages. And it does engage at 1700rpm so its not that high, maybe 2-300rpm to high. Tho I've read these should not idle below 1200rpm since its splash lubed.

Leaky intake for sure.

Ya think? It is leaky but ive sealed it with a vulcanicing tape. But will look into the whole engine soon.

Thunderdivine wrote:

Chopperhed wrote:

Thunderdivine wrote:

Btw you can see when i throttle up the clutch engages. And it does engage at 1700rpm so its not that high, maybe 2-300rpm to high. Tho I've read these should not idle below 1200rpm since its splash lubed.

Leaky intake for sure.

Ya think? It is leaky but ive sealed it with a vulcanicing tape. But will look into the whole engine soon.

If the idle adjustments don't work, and it still revs high, its a seriously lean condition. Definitely not a good situation.

Its either leaking between the carb and the engine, somewhere, or a fuel jet is plugged up. Assuming the airfilter is clean.

Chopperhed wrote:

Thunderdivine wrote:

Chopperhed wrote:

Thunderdivine wrote:

Btw you can see when i throttle up the clutch engages. And it does engage at 1700rpm so its not that high, maybe 2-300rpm to high. Tho I've read these should not idle below 1200rpm since its splash lubed.

Leaky intake for sure.

Ya think? It is leaky but ive sealed it with a vulcanicing tape. But will look into the whole engine soon.

If the idle adjustments don't work, and it still revs high, its a seriously lean condition.

Its either leaking between the carb and the engine, somewhere, or a fuel jet is plugged up. Assuming the airfilter is clean.

K thanks. There is a leak in the intake like i wrote. Its broken where the bolts go into the carb. But hoped i mended it.

Youre too good at this. Were gonna have to kick you out Thunder. lol

Doug Fackler wrote:

Youre too good at this. Were gonna have to kick you out Thunder. lol

Happy bday Doug!

Ya I should be over at heymow instead


More pics!

How i'm doing the front steering and Spindle A-arm mounts,


How i'm doing the disc brake, to get the disc to clear the tire.






How I'm still planning a hitch mount on it.




New Diesel Tach (cheap one), hope this will work???
Im trying to connect it to the AC out from the Opposed alternator.

Heymow? HEYMOW? This place is for real do-it-yourself'ers, heymow is for people who buy rather than build.... and spend more on paint and shiny rims than anything.

But thats only my opinion - and your build continually impresses me - such attention to detail!

prometheusEDI wrote:

Heymow? HEYMOW? This place is for real do-it-yourself'ers, heymow is for people who buy rather than build.... and spend more on paint and shiny rims than anything.

But thats only my opinion - and your build continually impresses me - such attention to detail!

I know it was a joke, and thanks.

a good joke at that lol... you almost had me fooled

It bloody worked as they say in the UK!

Installed the Diesel Boat Tach today, "Installed" hooked up 3-wires.


Also not doing much with the front physical now tho i got the front rear mount cut today and it was finally correct, tho the spot welds need to be ground down before it will fit


Realized im running out of space in the front, A-arms, shocks, fuel tank and exhaust is going there...



Soo.. Ima try make an exhaust chamber that sits inbetween the frame, that will save me some space, or alot actually. And it should also sound sweet.





3" Pipe between the frame then two 1-1/16 i think up as headers. And 2" out on each side as straight pipes.

Catch can for the 820 breather nipple! I said nipple!

Are you locking the diff in your trans. I am wondering because if you do not and put only one brake disc in the rear technically you will only have brakes on one rear tire.

It looks really good so far sure wish i had the resources you have for my builds.

goesman wrote:

Are you locking the diff in your trans.  I am wondering because if you do not and put only one brake disc in the rear technically you will only have brakes on one rear tire.

It looks really good so far sure wish i had the resources you have for my builds.

Thanks for the heads up and im not gonna lock it now, but maybe later. And the main brakes will be on the front.

Like 70% Front and 30% Rear. And the plan was to keep the stock 820 brake aswell, but more as a handbrake / slave.

Waiting for more important parts being watercut   - Sooo little progress, but on the exhaust.

Was a lot more difficult than I first thought, with all the thin sheet metal fab. and to figure out what angle it needs to be cut in.

3 Hours later... getting there.


Dual of these,


Angles look a bit weird it will be more horizontal once mounted,


Tommorrow I will do the small pipes up to the engine, thats the hard part.

And happy Fourth you guys  

Hey nice progress. I know that I said this a few times and other people say it too but I really like this build I
think it is one of the cleanest mower builds....kudos to you.
Happy fourth to you to!

Ive got to see this finished

man this thing is turning out awesome, im going to make you fly it out to me so i can drive it!! lol, i love it man

Awesome job can't wait to see it finished

when can i order my water jet parts to build mine

Haha thanks guys.

I got to change the 820 parts eventually,
Now the rear sprocket will sit nice and low, also swapped the shifter rod and fork.