My Engine is dead :(

Gast · Beitrag von **Gast** » 28 Jul 2006 22:35

Yesterday I was doing dragrace with one Yamaha TRX 850cc (96.y) and I won him but after race my engine started to make weird sounds when rpm became >2000.

Professionals told, that crankshaft has been broken.

What would you suggest me? Try to fix my old engine or try to find other one? How possible it is to find another engine like that? Maybe I can put in an engine from another bike? What caind of bike engines fit in my ZXR 750 H2 ? How much could cost an engine? How possible is to get another crankshaft? How hard is to strip, fix and put togather an engine?

Beitrag von **BASSWORLD** » 28 Jul 2006 23:09

Hi
First you should Look what Problem in the Engine is!
I wont buy a New Engine because someone sayed that the Engine is Broken.

Greetings
Alex

Der_Lolek · Beitrag von **Der_Lolek** » 28 Jul 2006 23:17

we had the same Problem some weeks ago here in the forum!

Harm had also an broken crankshaft so far as I know!
Here in germany it is possible to get an used running engine at ebay.de!
I don't know what your possibilities are to get an used one?!

My opinion is to get a complete used running engine! Of course you cam only try to change the crankshaft but this will take musch longer and wont give you the same result I think!

Zwotausender · Beitrag von **Zwotausender** » 29 Jul 2006 0:20

In ZXR 750 H2 there are only two possibilities for engines. H1 (106 HP) or even H2. But if you buy a H1 Motor you have to change some other parts like exhaust and so on,... .

I would look into your Motor, because i can´t belive that a Crankshaft ist broken.

Best regards
Tom

Beitrag von **Harm** » 29 Jul 2006 10:30

Yo.
First, I would remove the cylinder head.
And try to move the pistons.
Most times bearings of the connecting rods break first, 'cause thy're the last to get the oil.
If you find a broken bearing there you have the choice....
Get a new / used engine or repair the old one.
But...if u repair, u have to open the engine, then measure the crankshaft journals.
If u're lucky, u only have a broken bearing, if not, u also have to replace one or more connecting rods and replace/repair the crankshaft.
That would be a little expensive.....
good luck, if u need any help, u're welcome.
S.

Gast · Beitrag von **Gast** » 30 Jul 2006 21:22

Do I have to take engine out to remove the cylinder head or I can do it just by taking off the fuel tank?

Beitrag von **Mad Jens** » 30 Jul 2006 21:46

Hallo,

you have to take the engine out...

But the engine is broken anyway, so this will not be wasted work

Good luck and hope for less damage!

Gast · Beitrag von **Gast** » 31 Jul 2006 18:26

thanks for all this help!

I was wondering - maybe simplier will be to open an engine then taking off the cylinder head?

Beitrag von **Harm** » 31 Jul 2006 18:33

SoWhat hat geschrieben: I was wondering - maybe simplier will be to open an engine then taking off the cylinder head?

No way.
It's the only way.
Sure, you can open the engine from the bottom, but what for?
U'll be able to check the connection bearings from the bottom, but u also have to take the engine out.
Maybe u love it, lying under the machine and play with your fingers in it, but I don't think so.
Take that bitch out and open it.
then u'll be able to work forward, so if the connection bearings are ok, go forward to the main bearings.
and by the way u may check the cylinders inside.
all u have to do then, when all is done, u need new gaskets on head and foot.
S.

Gast · Beitrag von **Gast** » 31 Jul 2006 18:43

So now I go, take out an engine, open it from the bottom and check connection bearings, right?

PS. Is there a sinonim for word bearing? I can't find it in dictionary.

I was wondering - maybe simplier will be to open an engine then taking off the cylinder head?

- with that I was meaning that taking off cylinder head will be harder and opening engine will be easier. Did you get my idea?

Beitrag von **Harm** » 31 Jul 2006 18:49

sliding bearing
in german "gleitlager"
all bearings on crankshaft and conneting rods are sliding bearings.
dunno how to say as sinonim
S.
to taking off the head:
it's not hard, there are only 10 screws.
at the oil pan are more I think

And if u open the oil pan u have nothing won.
u now can slip the connecting rods a little (if u're lucky).
but I don't think, that this will be the easier way.
Yeah, I got your idea *s*
I'm more lazy then you, believe me...but here u have no choice.
Take the head off and take a look.
No matter, what especially is broken, the head and the cylinders have to be removed anyway.
Also the oil pan...
And generator, starter, clutch, oil pump, water pump, and so on.-....
S.

Gast · Beitrag von **Gast** » 31 Jul 2006 21:36

I found a manual how to insert a ZX9 engine in ZXR750 http://homepage.ntlworld.com/webzxr/zxr ... xr7-9.html

and I red in zxr750.de: "Der Motor stammt aus der GPX 750 R."

so as I understand I can search for ZXR750, ZX9R and GPX 750 R engine?

Beitrag von **Klaus69** » 31 Jul 2006 22:01

The conversion to the ZX9B Engine does not work in the H Series!

Gast · Beitrag von **Gast** » 31 Jul 2006 22:10

so I can use ZXR750H1, ZXR750H2 and GPX 750 R engine?

Which years of GPX 750R?

Beitrag von **Klaus69** » 31 Jul 2006 22:16

In fact you` re righto you will have a lack of hor, but if you want to use the GPX Engine you will have to change more than just the engine. The H Engine is based on the GPX but there are changes. E.G: the Cylinderhead. You will have a lack of horsepower...

Gast · Beitrag von **Gast** » 01 Aug 2006 22:33

Guten Abend!
Ich habe eine dumme Frage. Welcher ist die Zylinder Kopf? Welcher Teil musse ich beginnen mit (A,B,C,D,E oder F)? Bitte antworten im Englisch

Beitrag von **Klaus69** » 01 Aug 2006 22:40

Part B. Where the Carburators at the Intake side and the Exhaust System is on the other side. The Cylinderhead is the part where the cams are mounted.... Part A is also different in comparisson GPX to ZXR ( H Modell ).

Beitrag von **Harm** » 01 Aug 2006 22:45

I'll try

Fig. A is the Cam Cover.
Fig. B is the Cylinder head.
Fig C is the cylinder bank.
Fig D is the upper crankcase.
Fig E is the lower crankcase
Fig. F is the oilpan.

and we see there a nice H2 engine.
so you can NOT plug and play with an H1 or GPX engine.
because:
H1 has got different carburators (36mm), different oil filter (located on oil cooler), different exhaust system (4 in 2 in 1, H2 = 4in1)
GPX is nearly the same like H1 (I think)
Check out your engine, and then try to get a part-engine or parts you need.
Its possible to build an H2 engine based on a H1 engine (I did this last week..and still doing

)
So if u ned any help....u're welcome.
S.

and last but not least:
there are no dumb questions, only dumb answers.
S.

Gast · Beitrag von **Gast** » 01 Aug 2006 22:48

Danke!

And to take off part B do I have to take off part A too or part B comes off with all cams in it?

Beitrag von **Klaus69** » 01 Aug 2006 22:57

To unmount part B you will have to put part a away. Then you can see the cams.

It seems you did not work on an engine before. It` s only to find out where i schould come closer to the technical details...

Beitrag von **Harm** » 01 Aug 2006 22:57

First u remove part A.
Then u remove the Camshafts (u see them, when Part A is removed)
Then u may remove the head (part B)
S.

Gast · Beitrag von **Gast** » 01 Aug 2006 23:04

And does it really is easier than taking off part E?

I have newer worked with 4 stroke engines before.. This ir my first one

Beitrag von **Klaus69** » 01 Aug 2006 23:06

It s not easyer but necesary to unmount the Cylinderhead before you can take the Cylinder away. Do you have an manual?

Gast · Beitrag von **Gast** » 01 Aug 2006 23:08

I have an old manual in German (in PDF).

Beitrag von **Klaus69** » 01 Aug 2006 23:09

Okay, also for better understanding of your needs: what do you want to do at the end? Rebuild the Engine?

Okay dump question. I read from the beginning and now i am also informed.

Before you can remove part B you will have to remove the tensioner. The Tensioner is located below the Carburators.

@Harm: Which Side?

Otherwise you will run into problems when you try to remove the Chain from the cams.