4JB Oil Pump Cover p/n

[RVFmal]

Does anyone have a part number for the oil pump cover and requisite gasket for a 1993 TZR 125 R 4JB1 (have attached VIN plate on frame for reference)

It does not appear in the parts manual available to download from pure2strokespirit.net 

In addition, is there a workshop manual for these models that can assist with the tuning of the oil pump, YPVS system and servo motor assembly.

And last question, what do the Y-1 and Y-2 numbers on the head and barrel denote (currently have 2 machines. The one as a head and barrel combination of Y1/Y2 and the other Y2/Y1)?

[SpookDog]

It's the same as on a dtr125e. It might be shown on a parts list for them? I never bother with a gasket cause there's a drain hole in the bottom anyways 🙂 ...
Are you missing the cover?...

[RVFmal]

It's the same as on a dtr125e. It might be shown on a parts list for them? I never bother with a gasket cause there's a drain hole in the bottom anyways 🙂 ...
Are you missing the cover?...

Ah, champion, thank you. Will source the part number off of the DT's. Bit arbitrary to leave it off the 4JB's list.

I bought 2 4JB project bikes. Both are missing the covers (and a number of other parts that need to be replaced). Currently stripping and making a list of all the parts I will require.

[SpookDog]

Sweet! The one on my 4hw is the same as any early dtr125 cover. Your bike is basically a 4hw but for the European market. Don't suppose you have any body, fairing or seat plastic panels you want to sell?! 🙂
I'm building up my shed find 93/94 4hw at this same moment. Let me know if you find any good 'part for sale' finds, also what you need. I know of a rear calliper at the moment, if you need one...

[RVFmal]

Sweet! The one on my 4hw is the same as any early dtr125 cover. Your bike is basically a 4hw but for the European market. Don't suppose you have any body, fairing or seat plastic panels you want to sell?! 🙂
I'm building up my shed find 93/94 4hw at this same moment. Let me know if you find any good 'part for sale' finds, also what you need. I know of a rear calliper at the moment, if you need one...

Nothing spare unfortunately  I have 2 sets - both need work and repairs, the one set is better than the other). Will be on the hunt for the mirror stays as on both these bikes, as whoever had these bikes prior did a really cr@p job of repairing them)

From what I can gather, these are actually 4JB3's (1995). Still digging to be sure

[SeaR1ck]

Many parts are the same with the last gen 125 engines between the tzr and dt125.
The only real differences I could find was that the tzr 125's had e start and the dt125 is kick. So the two bikes have different centre cases.

Because of that the e start 125's have slightly different crankshafts. The e start tzr 125's have a longer end on the left side. To accommodate the different flywheel that has the starter gear that the starter motor turns.

The dt125 being kick start has the shorter side and different flywheel because no e start.

As far as I can tell when I was comparing the different parts. The transmission clutch oil pumps and the clutch cover oil pump cover reed valve are all shared.

Even the engine mounting points are the same. It's essentially a engine family. Top ends are also very similar. Dt200 and dt230 engines will mount up they have the same mounting points.

I own a tzm 150 a Thai market bike that uses that engine family. Many of the parts are tzr/dt125. Spend some time comparing the tzr/dt125 parts diagrams parts numbers and you will see.

[RVFmal]

Many parts are the same with the last gen 125 engines between the tzr and dt125.
The only real differences I could find was that the tzr 125's had e start and the dt125 is kick. So the two bikes have different centre cases.

Because of that the e start 125's have slightly different crankshafts. The e start tzr 125's have a longer end on the left side. To accommodate the different flywheel that has the starter gear that the starter motor turns.

The dt125 being kick start has the shorter side and different flywheel because no e start.

As far as I can tell when I was comparing the different parts. The transmission clutch oil pumps and the clutch cover oil pump cover reed valve are all shared.

Even the engine mounting points are the same. It's essentially a engine family. Top ends are also very similar. Dt200 and dt230 engines will mount up they have the same mounting points.

I own a tzm 150 a Thai market bike that uses that engine family. Many of the parts are tzr/dt125. Spend some time comparing the tzr/dt125 parts diagrams parts numbers and you will see.

Wonderful, thank you. Will compare the p/n's to find those that share.

[SpookDog]

Only real difference I could find was the crank has a different journal on the flywheel side, slightly wider. Even the dtr casings have the 'casting' areas' for the electric start. I don't know about the casing actually being wider on electric start bikes?...

A guy from another site told me about a firm in France that makes a conical 'shim' to make a dtr crank fit an electric start flywheel! It just slides over the journal and locks in with the woodruff key. Let's you use dtr 'Top Racing' cranks in electric start engines...

[RVFmal]

So, as it turns out the 4JB's (4FL/4HW/4HZ) did not come out of the factory with a oil pump cover in the main due to being fully faired models (and would expalin why it does not appear in the parts manual for these models.

Still a bit stumped on the Y1 and Y2 denotations on the head and barrel. Still digging.