Featured Tiger 90 Rebuild

Barrel now painted with a high temperature engine paint. the paint says it is all right up to 600 degrees C, but i can’t think that the barrels would get hotter than 250 degrees.

 

All the fins on the iron barrel are intact. One is missing from the alloy head.

 

Fitted new guides for cam followers.

 

Barrel, pistons etc fitted all right. A good afternoon in the workshop.

 

I’m sure it’s gone to a good home, where it torques all day long.

 

The engine is in the frame, but the bike is off the bench as my daily ride has just blown a head gasket. In this pic the head has been placed on the barrel just to keep dust out. Someone has wandered in to inspect the bike.

 

Thank you @speedrattle, that is very useful info. I will add that upgrade on the to do list.

 

The good news is that my daily ride is now repaired, so work can restart on the T90. Just for fun, here is a pic of the blown head gasket, no clues.

 

Pulled the ignition coils out of the (shrinking) box of bits. The resistances on the primary coil (two outer connections) and the secondary (centre HT connection and an outer one) are similar to a working 12v coil. That’s close enough to start, i will put them on the bike and see how good they are when i get it running. Need to clean them first.

 

The carb that was on the bike is an Amal mk1 concentric 930/22. Spec as follows:
1 3/16 bore
928 2.5 slide
needle with 3 ring marks / three grooves, clip in groove 1
150 main jet
needle jet not removed
pilot jet 20.

The carb that SHOULD be on the bike is an Amal Monobloc 376/300
15/16 bore
376 / 3 slide
needle type C / clip in groove 3
180 main jet
.106 needle jet
pilot jet 20.

i’m surprised it even ran.

 

Despite the carb being the wrong spec, it’s been stripped, ultra-sonic cleaned and reassembled.

 

Although it doesn’t look much cleaner the galleries and internals have been washed and blown through with high pressure air.