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I have been thinking of trying to retro an oil cooler on the bike to help this. My only worry is having the oil pump keep up. I figure If I can splice it after the tank before it enters into the engine it can be gravity fed, but I really don't want to starve the bottom end. I wonder if I could get a small electric pump to help push it through.

I have also considered welding fins to the oil tank to help cool. YES this will work.

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Agreed, or you can advance the position of the cam gear on the crank with a special cam gear puller-pusher that I have made

So I just finished the insurance/registration process. This was my conversation:

“Umm…Is this an off-hwy or on–hwy bike”
“On-Hwy”
“Oh, Okay”

Solved

PS- MY bike is totally street legal, I just don't want to deal with having to go for inspection at $100 + 3 weeks of not riding

Hopefully my next post will be my "first ride review"

Years back there were oil cooler "kits" for the XT/TT600s and some of the desert racers welded on extended head fin kits for extra cooling.  No real problem with the oil cooler keeping up.

Swiss

Edited by Swiss, 28 July 2011 - 12:49 PM.
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My ladies DR has an oil cooler..'was wondering about one for the TT. It got hot enough that when I shut it down, I couldn't start it agin until cooled off. Going to have to figure something out for it..Thanks for the ideas and I'll look around and see about the "kit"..thanks Swiss.

I thought these bikes had adjustable timing..sorry about that Sky-B. All my other bikes have it.

TheGrayRider said:

I will deff take those carbs off your hands

My new desktop photo. TT600!!

Post it up!  My son is now 26.  

Here he is on my TT600 a few years ago...

ordered a set of these jets..http://cgi.ebay.com/...e=STRK:MEWAX:IT

'hope they do the trick..supposed to be "taylor fit" to my bike with it's aftermarket pipe and my altitude.

I'm amassed now days at how fast time go's these days..wasn't "too" long ago my 18 year old son was sitting on my "new to me" 1991 YZ250WR..that was in the summer of 1993..My God, where does the time go?

Warrlac said:

Cool pic, Warrlac. Looks like you had a full aftermarket exhaust with a 3" Supertrapp. What brand? What skid plate is that? And while I'm asking questions----any other mods done that we don't see?

blazer7671 said:

No kidding. Time is just flying by, isn't it....

I guess I'm the young'n. I'm from the same year as my bike

So I tried to ride the TT to work today after laboring to get all my parts on. I made it about 10km before I had to turn around. It appears that I have a rpm ceiling at 4K that the bike hits and then can't go past. I think this is the "rev limiter" issue that Thesky was dealing with. It also does not appear to have a lot of power. I think I need to do some jetting work to get it right.

Blazer - Let me know how that Jet kit works out and what your #'s are. I may have a need for one in the near future.

Thesykboy- did you ever get your 4K rpm ceiling officially sorted out? It appears that I have a similar issue. What are your Jet #'s?

Got the jets today..came with 3 jets and drill bits to drill out something..don't know what yet. Going to start on it tomorrow. Jets are 125, 126 and 130..

Seems 135/135 is stock and thats what was in my 1 carb. The one on the bike is 135 and 90 in the CV. I don;t think I wrote that down right a 90 seems WAY under what it should be, even for 3500ft.

I tried switching spark plugs last night to the DPR7EA but that didn't help. I pulled the old plug and it was covered with soot. Like its burning oil badly

Its still weird...it pulls fine for the first 4K rpm, though maybe not as strong as everyone says this bike is. I could not pull up the front wheel if I tried.

At 4K it maxes out and further throttle twist does nothing. It sounds like it wants to continue past 4K but it won't (like a rev limiter). IT also stumbles a bit there, like misses a fire 1 out of 40 times.

I picked up a basket case 1994 YZ250 today..what was I thinking?

Tim..Things to consider..plugged exhaust, jets are too big..things like that. I can make my DR run like a champ, but the carb is WAY more simple.. My TT runs lean and gets hot..doesnt have a rev limmit isue, though. This kit I bought is supposed to be taylor fit for my bike, altitude and exhaust..working on it now.

I put a kit like that in mine, i have 11-1 piston and cam. jetted up some. here is a heads up for the tt600. working on a friends tt600 that was sitting. he cleaned carbs and when he went to start it the kick starter messed up. well i took the clutch cover off and pulled the starter shaft and gear out. I found the starter shaft STOP (2 small plates and 2 bolts + locking plate) left bolt broke off and kick starter stop bent the other bolt and was stuck between the plates. right bolt boss was cracked also. (i did get the broken bolt out) don't know if it was a kick-back that did this. the comp release is a hot-start from a new bike? does not work very well (real hard to pull) as it's only 2" long or less. so if in the clutch side ck the kick-starter stop bolts.

Tim--have you made sure the 2nd carb slide is opening? (with carb boots off and looking in while its running? float is real critical also. I had a similar problem and i am pretty sure it was running out of fuel. then i had a high rpm miss cdi? I have wayne gums in it now and it runs great?? as i stated before he says tt and xt have different adv curves??
how does it start? mine starts on the first kick most of the time hot or cold.------

I did some more testing tonight:

-Slide in secondary carb is moving, engaging 1/8-1/4 throttle behind the primary.
-Removing the air filter does little to change the situation. It may run a little higher RPM but not a big increase
-Exhaust is not blocked, I do still have the SS woool jammed in there but it was doing this before I put that in.
-Bike is running hot (I think). I get a reading of ~325f off the exhaust stud
-I have some valve noise but I think it may be normal:thinking:

-Also found an oil leak in my case seal...but thats for another time

Comments?

I think a leak down test is next and pull out the SS wool.

Thanks for the help guys!

I just read through most of this thread again and I think my issues sound allot like Thesyk's. I should be syncing my carbs tonight or tomorrow, try to get thing running right. I will also check out the carb boots for leaks.

I think I will get a leak down tester (or a compression tester and the parts to build a leak down tester) and test that out too....man, I just want to ride my bike

Bergman - did you ever test out those TT600 CDIs out again? I'm wondering if I can just plug mine in and try to run it?!

Thanks again guys for all the ideas!

Do you need to "sync" dual carbs on a single plenum/cylinder motor?  Isn't that like trying to sync the butterflies on a 4 barrel carb on a single plenum intake?

I had always assumed "syncing" wasn't needed for the dual carb Honda and Yamaha singles of the 80's.  But, I am hardly an expert.

RacerXr said:

Ummm, I'm no expert either but these suckers need lots of fuel. I believe that the sync is to help supply enough. I guess if you had strange jets in it you may be able to have the sync point set somewhere else but not sure why you would want that.  Besides, I think that as you open it up you want things to be sync'd up so that you have ~ equal fuel amounts through both ports.

I could be WAY out to lunch but could this not be why the small end of the con rod wears badly on one side, from unequal concentration of fuel within the compressed mixture? Just a guess.

Warrlac - You asked about alternate carbs. Apparently Ninja 250 carbs fit or the Raptor 660 carbs. I had read somewhere about someone doing a 41 mikuni setup but I'm not sure. The boots may be and issue for that

Bergman - I know what your talking about with the kicker! When I was assembling mine I found that I had 2 bad sets of brackets (almost bent/broken right through) and 1 good set. Whenever I get to doing bike #2 I may decide to modify this so its less of problem.

did you take out the fuel needles seat (a screw holds it in) there is a filter on the end of it. get rid of the filter. just took a friends apart and it was full of junk. i think the carb synk the manual talks about is for fuel starvation. tiny hose to 2nd carb and only float bowl. opening up both at the same time might be to big a demand for the float bowl ??

did not test cdi's after my fuel problems it did run. i don't think there's much difference in the adv of the xt and tt.

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Beyond the difference in advance are the 2 electrically the same (I can't remember). Can I just plug the TT CDI right in?

plug in is the same for my xt cdi and tt--some later might be different??