DR750 & DR800 owners thread

[aapo]

Originally Posted by robmoto

Just a little tip for you , only use suzuki valve stem seals, the after market ones go hard in no time.
3 sets of valves why , maybe tappet settings could be a little tight, and or runnung a little lean, have a look at the colour of the carbon on the valves may help you determin whats going on.

I've used only suzuki valve stem seals and orginal mikuni parts in carbs, learned that hard way...

original valves were replaced when there was some 60 000km in clock, also pistone was replaced by first versize 050 then. I rebuild engine bottom at 85 000 km (if rebember rigt) the top end was like new.

No I have damaged cylinder (heavy oil consumption) and damage in valves. And yes, there were some carburetor problems and some serious overheating while offroading... i was riding too lean.

So i think your dianosis is right.

I'm just wondering how long these valve stems last? Seals for those are easy to change but stem itself reguires some professional help.

[robmoto]

Appo ,when I bought my orange bike it was in very poor condition but still was rideable the piston would knock something terrible untill it warmed up I am just giving you an Idea how things were when I got it.
Now it looked like to me the head had never been of it, I did replace the exaust valves only and new stem seals on all 4 valves.
My point is this bike is running with no problems because of other work I did to the motor the valve guides have never been replaced and it has done 142k
If you can feel play in the valve there probably stuffed.

[jimbobthebear]

Hello people

Can anybody remember the odd front wheel bearing size? Some bikes use an identical pair and some (mine included) run a smaller diameter but wider bearing in one side. Last time I made it up from two thin ones. I can't get in the garage to measure it at the moment.

Thanks guys

[Simosez]

well i finally got around to cutting the side out of a spare filter and seeing if it makes a difference.
after i cut out the triangle, i ran a bead of silastic around the cut edge to make a rounded profile to reduce turbulence.
this mod is worth doing along with 125 mains and richening up the needle.
with the jetting mods and stock filter there was a slight increase in performance but was still flat up top.
after the filter mod, this thing pulls hard all the way to 148k/ph and was still pulling hard but i was running out of road this is a definite improvement. i thought the old girl might be getting a bit tired but after today i think she still goes allright
Rob, that yellow bike of yours must be impressive

[robmoto]

Gidday Simon, she,s a goer mate, hey there are about 10 or so blokes staying here friday night the 15th to Sun sun the 17th with a ride on the sat 16th remember last year we called it the Turon River Classic .
Are you comin over give us a ring and I will give you the details.

[mait]

Any of you guys knows if SR43 camshaft will fit into SR42 head and do its job there?
I know the timing and lift is a bit different but other than that?

[Ladder106]

As far as I know they are identical for fit and use.

The exception is the "A" style cam from the UK that has a bit earlier intake timing than the "B" style from Germany.

I think you get a few more HP with the "A" style. it should be stamped on the cam end where the cam timing marks (that line up with the head casting) are located.

[Simosez]

Originally Posted by robmoto

Gidday Simon, she,s a goer mate, hey there are about 10 or so blokes staying here friday night the 15th to Sun sun the 17th with a ride on the sat 16th remember last year we called it the Turon River Classic .
Are you comin over give us a ring and I will give you the details.

cheers Rob. i'll see how i go, things are a bit busy at the moment. i might try and meet up with you for the day ride.
how is the river? have you had the sort of rain we have had east of the range? the rivers ar raging over this way.

[robmoto]

Simon not much rain over here really we are missing out, although not bone dry.

[mait]

Thanks Ray. This is what I thought myself, too. Why did I ask it was because SR43A camshaft is still available as Suzuki original part. While SR42A camshaft is superceded and replaced by SR43B type camshaft AFAIK.
I have DR800 SR42B and the idea was to release some more potential from the engine with less restrictive "A"-model camshaft.

If you know of any reason why these two (SR42B engine and SR43A camshaft) should NOT be joined together in holy DR Big, speak now, or... I may be screwed

I think I've read in German Big forum (with the help of google translator) someone had SR43 camshaft in SR41 for a year without problems, so it should be working fine in SR42, too.

BTW the 106mm pistons are not ready yet. I have no idea why it is taking so long. Or maybe its just me being impatient.

[wundis]

Perhaps it's a good time to discuss this publicly rather than ask mait in private

To add up to his question:

Since my camshaft is worn beyond recognition (ok, i may be exaggerating a bit here) and I am still considering multiple options on what to do with it. Does anyone of you know if one can use a brand new SR43A camshaft (12711-31D00 ) on a SR43B (in a perfect world the camshaft should be 12711-31D10) bike with SR43B CDI (32900-31D10) (again, in a perfect world A camshaft should go with A cdi (32900-31D00))? That is taking in mind the differences between the camshafts and cdi (different timing).

PS as an alternative, I am considering using local camshaft restoration services from a reliable shop, they do that for 72 eur (that includes restoration of camshaft and 2 rocker arms). On the downside - I don't think i would be sleeping as calmly with this restoration as with HRT services, but the difference in price (and transport) is playing a big role here.

[Resi]

Originally Posted by mait

I think I've read in German Big forum (with the help of google translator) someone had SR43 camshaft in SR41 for a year without problems, so it should be working fine in SR42, too. .

Hi Mait, they should be interchangeable... ;)

Originally Posted by mait

BTW the 106mm pistons are not ready yet. I have no idea why it is taking so long. Or maybe its just me being impatient.

Yes. I don't know who does your pistons, mine took about 4 or 5 weeks...

Cheers,
Lars

[mait]

Lars, 5 weeks to make the pistons was what I was told, too. I think we are in the middle of week 5 now. I'll shoot them an e-mail tomorrow.

About camshaft -
I think I'll give it a try to put SR43A camshaft in SR42B. I am quite sure there will be no mechanical conflict.
Like Wundis already pointed - I am curious too how the camshaft will act with different CDI (read: ignition timing) it was not designed to work with. I suppose it shouldn't be a problem, since many aftermarket cams are produced for BIGs and they don't care if it goes into SR41 or SR43, A or B model AFAIK.

And then there is another possible mod called tunable CD Ignition which allows you to design your own ignition curve in your computer
I hope these guys are still in business: http://www.ignitech.cz/english/aindex.htm
Look for section "SPARKER DC-CDI - capacitive ignition for 1 cyl. motorbikes" on their site.
I am not too serious about this mod right now but the idea has haunted me since I read SR43 had different ignition curve.
OK, over and out now. I think I am just overthinking and should get working on the bike finally. Snow is already melting here...

[Resi]

Originally Posted by mait

About camshaft -
I think I'll give it a try to put SR43A camshaft in SR42B. I am quite sure there will be no mechanical conflict.

Yeah. I've got a couple of regrund camshafts, used in SR41, 42 and 43...
But, I always check for clearance.

Cheers,
Lars

[aapo]

Originally Posted by mait

Lars, 5 weeks to make the pistons was what I was told, too. I think we are in the middle of week 5 now. I'll shoot them an e-mail tomorrow.

About camshaft -
I think I'll give it a try to put SR43A camshaft in SR42B. I am quite sure there will be no mechanical conflict.
Like Wundis already pointed - I am curious too how the camshaft will act with different CDI (read: ignition timing) it was not designed to work with. I suppose it shouldn't be a problem, since many aftermarket cams are produced for BIGs and they don't care if it goes into SR41 or SR43, A or B model AFAIK.

And then there is another possible mod called tunable CD Ignition which allows you to design your own ignition curve in your computer
I hope these guys are still in business: http://www.ignitech.cz/english/aindex.htm
Look for section "SPARKER DC-CDI - capacitive ignition for 1 cyl. motorbikes" on their site.
I am not too serious about this mod right now but the idea has haunted me since I read SR43 had different ignition curve.
OK, over and out now. I think I am just overthinking and should get working on the bike finally. Snow is already melting here...

With ignitech you can the get rid of ignition power source coil and update stator to similar used on africa twin. In case you need lots of electricity (light, heated grips etc. Could be usefulle at least up here in nort...) But then you also need to have battery in good condition to have spark.

This is interesting choice for SR41 owners, since SR41 stator is avilable only from suzuki, €€€€. or then just re coil old one....

-aapo